WO2017000671A1 - 一种分布式天线系统及信号传输方法 - Google Patents

一种分布式天线系统及信号传输方法 Download PDF

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Publication number
WO2017000671A1
WO2017000671A1 PCT/CN2016/081584 CN2016081584W WO2017000671A1 WO 2017000671 A1 WO2017000671 A1 WO 2017000671A1 CN 2016081584 W CN2016081584 W CN 2016081584W WO 2017000671 A1 WO2017000671 A1 WO 2017000671A1
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WO
WIPO (PCT)
Prior art keywords
radio frequency
signal
frequency band
local oscillator
mixer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2016/081584
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English (en)
French (fr)
Inventor
阳建军
孙科
汪孙节
王擘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to KR1020177037605A priority Critical patent/KR102024103B1/ko
Priority to JP2017563182A priority patent/JP2018525860A/ja
Priority to EP16817035.5A priority patent/EP3297314A4/en
Publication of WO2017000671A1 publication Critical patent/WO2017000671A1/zh
Priority to US15/839,009 priority patent/US10547353B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18Network planning tools
    • H04W16/20Network planning tools for indoor coverage or short range network deployment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022Site diversity; Macro-diversity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0491Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more sectors, i.e. sector diversity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • H04W88/085Access point devices with remote components
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02Transmitters
    • H04B1/04Circuits

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a distributed antenna system and a signal transmission method.
  • DAS Distributed Antenna System
  • the system capacity of the DAS system is usually increased by transmitting a dual-stream or multi-stream signal on the DAS system, for example, the multi-channel signals transmitted by the base station are frequency-converted at the near end, and signals having different frequency bands are transmitted to the far-end through the DAS line.
  • the antenna at the remote antenna, demodulates the signals of these different frequency bands through multiple antennas to realize the transmission of multiple signals, thereby expanding the capacity of the DAS system.
  • FIG. 1 is a schematic diagram of two channels of signals transmitted by the existing DAS; as shown in FIG. 1, a mixer and a splitter/combiner are disposed at the near end, and one of the original signals is mixed by using a mixer. Processing, forming a signal S2 different from the original signal S1 and transmitting to the shunt/sense, the other original signal and the mixed signal S2 are combined by the shunt/combiner and sent to the far end through the DAS line.
  • the remote end is provided with a shunt/combiner, an active mixer and a plurality of antennas. After the shunt/combiner receives the signal sent by the DAS, the original signal S1 and the converted signal S2 are filtered out, and the original signal is transmitted. After transmitting through an antenna, the signal S2 is sent to the active mixer, and is restored by the active mixer to the original signal S1 and then transmitted through the other antenna, thereby realizing the dual stream transmission and providing the system capacity.
  • the mixer set at the far end of the existing DAS system is usually an active mixer, which requires a power supply unit at the near end to supply power (as shown in Figure 1), while the DAS line in the existing DAS cannot transmit electrical signals.
  • the devices on the existing DAS line such as replacing them with active devices
  • re-lay the cables to supply power to the active mixers; however, due to DAS
  • the passive components on the line are deployed in a special position such as the indoor ceiling, and the power supply unit is located in the equipment room and is far away from the active mixer. Therefore, the devices on the existing DAS line are modified (for example, replaced with The source device) or the way the cable is laid may cause difficulties in construction and high cost.
  • the present invention innovates the transmission architecture of the existing DAS, and proposes a distributed antenna system and a signal transmission method to solve the problem that the existing implementation supplies power to the active mixer of the DAS remote end.
  • the construction is difficult and the cost is high.
  • an embodiment of the present invention provides a distributed antenna system DAS, including: a near-end signal generating device, a passive DAS line, and a remote transmitting device, where the near-end signal generating device includes: a source, a first signal a generator; the remote transmitting device includes: a first passive mixer and a first antenna;
  • the first signal generator is configured to generate a first local oscillator signal, and send the first local oscillator signal to the first passive mixer through the passive DAS line;
  • the first passive mixer is configured to receive the first local oscillator signal and a downlink radio frequency signal having a second radio frequency band;
  • the first passive mixer is further configured to perform a mixing process on the received downlink radio frequency signal having the second radio frequency band by using the first local oscillator signal to form the first radio frequency band. Sending, by the first downlink radio frequency signal, the first antenna;
  • the first antenna is configured to transmit the received first downlink radio frequency signal having the first radio frequency band.
  • the near-end signal generating device further includes: a first mixer and a combiner;
  • the remote transmitting device further includes: the splitter;
  • the first mixer is configured to receive the first downlink radio frequency signal with the first radio frequency band sent by the source;
  • the first mixer is further configured to perform mixing processing on the first downlink radio frequency signal by using the first local oscillation signal generated by the first signal generator, and the generated after the mixing A downlink radio frequency signal having a second radio frequency band is sent to the combiner; or
  • the first signal generator is specifically configured to send the first local oscillator signal to the combiner;
  • the combiner is configured to receive the downlink radio frequency signal having the second radio frequency band and the first local oscillator signal, and receive the downlink radio frequency signal with the second radio frequency band and the first The vibration signal is combined to form a downlink RF combining signal, and then sent to the splitter through the passive DAS line;
  • the splitter is configured to receive the downlink radio frequency combining signal, separate the received signal included in the downlink radio frequency combining signal, acquire a downlink radio frequency signal having the second radio frequency band, and the first a local oscillator signal is sent to the first passive mixer;
  • the first passive mixer receives the first local oscillator signal and a downlink radio frequency signal having a second radio frequency band, specifically receiving the first local oscillator signal sent by the splitter, and the A downlink radio frequency signal having a second radio frequency band.
  • the remote transmitting device further includes: a second antenna;
  • the combiner is further configured to receive a second downlink radio frequency signal that is sent by the source and has a first radio frequency band, and combine the second downlink radio frequency signal into the downlink radio frequency combination signal to the Transmitter
  • the splitter is further configured to acquire the second downlink having the first radio frequency band Transmitting the frequency signal to the second antenna;
  • the second antenna is configured to transmit the second downlink radio frequency signal with the first radio frequency band.
  • the near-end signal generating device further includes: a second signal generator, a second mixer; the remote transmitting device further includes: a second passive mixer and a third antenna;
  • the second signal generator is configured to generate a second local oscillator signal, and send the second local oscillator signal to the combiner;
  • the second mixer is configured to receive a third downlink radio frequency signal that is sent by the source and has a first radio frequency band;
  • the second mixer is further configured to receive the second local oscillator signal sent by the second signal generator, and use the second local oscillator signal to the third downlink radio frequency having the first radio frequency band
  • the signal is subjected to mixing processing to form a downlink radio frequency signal having a third radio frequency band and then sent to the combiner; or
  • the third downlink radio frequency signal having the first radio frequency band is mixed and processed by using the local oscillator signal generated by the second mixer to form a downlink radio frequency signal having a third radio frequency band, and then sent to the combiner Wherein the third radio frequency band and the first radio frequency band do not overlap each other;
  • the combiner is further configured to receive the downlink radio frequency signal with the third radio frequency band and the second local oscillator signal sent by the second signal generator sent by the second mixer, and receive the received The downlink radio frequency signal having the third radio frequency band and the second local oscillator signal are combined and sent to the splitter in the downlink radio frequency combining signal;
  • the splitter is further configured to: acquire the downlink radio frequency signal having the third radio frequency band and the second local oscillator signal, and send the signal to the second passive mixer;
  • the second passive mixer is configured to perform a mixing process on the downlink radio frequency signal with the third radio frequency band by using the second local oscillator signal to form the third downlink radio frequency with the first radio frequency band Sending a signal to the third antenna;
  • the third antenna is configured to receive the third third frequency band having the first radio frequency band
  • the downlink RF signal is transmitted.
  • an embodiment of the present invention provides a distributed antenna system DAS, including: a near-end signal receiving device, a passive DAS line, and a remote receiving device, where the near-end signal receiving device includes: a sink, and a first signal occurs.
  • the first signal generator is configured to generate a first local oscillator signal, and send the first local oscillator signal to the first passive mixer through the passive DAS line;
  • the first antenna is configured to receive a first uplink radio frequency signal having a first radio frequency band, and send the first uplink radio frequency signal having the first radio frequency band to the first passive mixer;
  • the first passive mixer is configured to receive the first local oscillator signal, and use the received first local oscillator signal to perform mixing on the first uplink radio frequency signal having the first radio frequency band Processing, forming an uplink radio frequency signal having a second radio frequency band, and transmitting the same to the first mixer through the passive DAS line;
  • the first mixer is configured to receive the uplink radio frequency signal with a second radio frequency band
  • the first mixer is further configured to perform a mixing process on the received uplink radio frequency signal having the second radio frequency band by using the first local oscillator signal generated by the first signal generator to form the The first uplink radio frequency signal of the first radio frequency band is sent to the sink; or
  • the remote receiving device further includes: a second antenna, a first combiner; and the near-end signal receiving device further includes: a second Road device
  • the second antenna is configured to receive a second uplink radio frequency signal having a first radio frequency band, and send the second uplink radio frequency signal having the first radio frequency band to the first combiner;
  • the first passive mixer is specifically configured to send the uplink radio frequency signal with the second radio frequency band to the first combiner;
  • the first combiner configured to receive the second uplink radio frequency signal with the first radio frequency band and the second passive frequency transmitter sent by the second antenna
  • the uplink radio frequency signal of the radio frequency band combines the second uplink radio frequency signal having the first radio frequency band and the uplink radio frequency signal with the second radio frequency band to form an uplink radio frequency combining signal, and then passes the passive
  • the DAS line is sent to the second splitter; the first radio frequency band and the second radio frequency band do not overlap each other;
  • the second splitter is configured to receive the uplink radio frequency combining signal, and separate the received signal in the uplink radio frequency combining signal to obtain the second uplink radio frequency signal with the first radio frequency band. Sending to the sink, acquiring the uplink radio frequency signal with the second radio frequency band, and sending the signal to the first mixer;
  • the first mixer is specifically configured to receive the uplink radio frequency signal with the second radio frequency band that is sent by the second splitter.
  • the near-end signal receiving device further includes: a second signal generator, a second combiner, and a second mixer; the remote receiving device further includes: a third antenna, a second passive mixer, and a a splitter
  • the second signal generator is configured to generate a second local oscillator signal, and send the second local oscillator signal to the second combiner;
  • the first signal generator is specifically configured to send the first local oscillator signal to the second combiner;
  • the second combiner is configured to receive the first local oscillator signal sent by the first signal generator and the second local oscillator signal sent by the second signal generator, and The first local oscillator signal and the second local oscillator signal are combined to form a first combined signal, and then sent to the first splitter via the passive DAS line;
  • the first splitter is configured to receive the first combined signal, separate the signal in the first combined signal, and obtain the first local oscillator signal to the first Transmitting by the source mixer, acquiring the second local oscillator signal, and transmitting the signal to the second passive mixer;
  • the first passive mixer is specifically configured to receive the first local oscillator signal sent by the first splitter;
  • the third antenna is configured to receive a third uplink radio frequency signal having a first radio frequency band, and send the third uplink radio frequency signal having the first radio frequency band to the second passive mixer;
  • the second passive mixer is configured to receive the second local oscillator signal sent by the first splitter, and the third uplink radio frequency with the first radio frequency band sent by the third antenna Signaling, using the second local oscillator signal to perform a mixing process on the third uplink radio frequency signal having the first radio frequency band, forming an uplink radio frequency signal having a third radio frequency band, and transmitting the uplink radio frequency signal to the first combiner;
  • the third radio frequency band and the second radio frequency band do not overlap each other;
  • the first combiner is further configured to receive the uplink radio frequency signal with the third radio frequency band sent by the second passive mixer, and combine the uplink radio frequency signal with the third radio frequency band Transmitting, by the passive DAS line, the uplink radio frequency combining signal to the second splitter;
  • the second splitter is further configured to obtain the uplink radio frequency signal with the third radio frequency band and send the signal to the second mixer;
  • the second mixer is configured to receive the uplink radio frequency signal with the third radio frequency band sent by the second splitter;
  • the second mixer is further configured to perform mixing processing on the uplink radio frequency signal having the third radio frequency band by using the second local oscillator signal generated by the second signal generator to form the Sending a third uplink radio frequency signal of a radio frequency band to the destination; or
  • an embodiment of the present invention provides a signal transmission method, which is distributed days. Performed by a line system DAS, the DAS comprising: a near-end signal generating device, a passive DAS line, and a remote transmitting device, the near-end signal generating device comprising: a source, a first signal generator; and the remote transmitting device
  • the method includes: a first passive mixer and a first antenna; and the method includes:
  • the first signal generator generates a first local oscillator signal, and transmits the first local oscillator signal to the first passive mixer through the passive DAS line;
  • the first passive mixer receives the first local oscillator signal and a downlink radio frequency signal having a second radio frequency band;
  • the first passive mixer performs a mixing process on the received downlink radio frequency signal with the second radio frequency band by using the first local oscillator signal to form the first downlink with the first radio frequency band. Transmitting a radio frequency signal to the first antenna;
  • the first antenna transmits the received first downlink radio frequency signal having the first radio frequency band.
  • the near-end signal generating device further includes: a first mixer and a combiner; the remote transmitting device further includes: a splitter;
  • the sending, by the first signal generator, the first local oscillator signal to the first passive mixer includes:
  • the first signal generator sends the first local oscillator signal to the combiner, and the first local oscillator signal is sent by the combiner to the first passive mixer;
  • the method further includes:
  • the first mixer receives the first downlink radio frequency signal with the first radio frequency band sent by the source;
  • the first mixer performs a mixing process on the first downlink radio frequency signal by using the first local oscillator signal generated by the first signal generator, and the second radio frequency generated after mixing
  • the downlink radio frequency signal of the frequency band is sent to the combiner; or
  • the splitter Receiving, by the splitter, the downlink radio frequency combining signal, separating the received signal included in the downlink radio frequency combining signal, acquiring a downlink radio frequency signal having the second radio frequency band, and the first local oscillator Sending a signal to the first passive mixer;
  • the receiving, by the first passive mixer, the first local oscillator signal and the downlink radio frequency signal having the second radio frequency band specifically include:
  • the first passive mixer receives the first local oscillator signal sent by the splitter and the downlink radio frequency signal with a second radio frequency band.
  • the remote transmitting device further includes: a second antenna; the method further includes:
  • the combiner receives a second downlink radio frequency signal that is sent by the source and has a first radio frequency band, and combines the second downlink radio frequency signal and sends the second downlink radio frequency signal to the splitter in the downlink radio frequency combination signal;
  • the splitter obtains the second downlink radio frequency signal with the first radio frequency band and sends the second downlink radio frequency signal to the second antenna;
  • the second antenna transmits the second downlink radio frequency signal with the first radio frequency band.
  • the near-end signal generating device further includes: generating a second signal And the second transmitter;
  • the remote transmitting device further includes: a second passive mixer and a third antenna;
  • the method further includes:
  • the second signal generator generates a second local oscillator signal and transmits the second local oscillator signal to the combiner;
  • the second mixer receives a third downlink radio frequency signal that is sent by the source and has a first radio frequency band;
  • the second mixer receives the second local oscillator signal sent by the second signal generator, and mixes the third downlink radio frequency signal with the first radio frequency band by using the second local oscillator signal Processing, forming a downlink radio frequency signal having a third radio frequency band, and transmitting the signal to the combiner; or
  • the third downlink radio frequency signal having the first radio frequency band is mixed and processed by using the local oscillator signal generated by the second mixer to form a downlink radio frequency signal having a third radio frequency band, and then sent to the combiner Wherein the third radio frequency band and the first radio frequency band do not overlap each other;
  • the combiner receives the downlink radio frequency signal with the third radio frequency band and the second local oscillator signal sent by the second signal generator sent by the second mixer, and the received The downlink radio frequency signal of the three radio frequency bands and the second local oscillator signal combination are sent to the splitter in the downlink radio frequency combining signal;
  • the second passive mixer performs a mixing process on the downlink radio frequency signal having the third radio frequency band by using the second local oscillator signal to form a third downlink radio frequency signal with the first radio frequency band. Transmitting in the third antenna;
  • the third antenna transmits the received third downlink radio frequency signal having the first radio frequency band.
  • an embodiment of the present invention provides a signal transmission method, which is performed by a distributed antenna system DAS, where the DAS includes: a near-end signal receiving device, a passive DAS line, and a remote receiving device, and the near-end signal receiving
  • the device includes: a sink, a first signal generator, and a first mixer;
  • the remote receiving device includes: a first passive mixer and a first antenna; and the method includes:
  • the first signal generator generates a first local oscillator signal, and transmits the first local oscillator signal to the first passive mixer through the passive DAS line;
  • the first passive mixer receives the first local oscillator signal, and performs mixing processing on the first uplink radio frequency signal having the first radio frequency band by using the received first local oscillator signal to form a first An uplink radio frequency signal having a second radio frequency band is then sent to the first mixer through the passive DAS line;
  • the first mixer receives the uplink radio frequency signal having a second radio frequency band
  • the first mixer performs a mixing process on the received uplink radio frequency signal having the second radio frequency band by using the first local oscillator signal generated by the first signal generator to form the first radio frequency band.
  • the first uplink radio frequency signal is sent to the sink; or
  • the remote receiving device further includes: a second antenna, a first combiner; and the near-end signal receiving device further includes: a second Road device
  • the sending, by the first passive mixer, the uplink radio frequency signal with the second radio frequency band to the first mixer includes:
  • the method further includes:
  • the first combiner will receive the second uplink radio frequency signal with the first radio frequency band and the second radio frequency band sent by the first passive mixer.
  • Upstream radio frequency signal combining the second uplink radio frequency signal having the first radio frequency band and the uplink radio frequency signal having the second radio frequency band to form an uplink radio frequency combining signal, and then passing through the passive DAS line Transmitting by the second splitter; the first radio frequency band and the second radio frequency band do not overlap each other;
  • the uplink radio frequency combining signal Receiving, by the second splitter, the uplink radio frequency combining signal, separating the received signal in the uplink radio frequency combining signal, acquiring the second uplink radio frequency signal having the first radio frequency band, and then performing the Sending to the sink, acquiring the uplink radio frequency signal with the second radio frequency band, and sending the signal to the first mixer;
  • the receiving, by the first mixer, the uplink radio frequency signal with the second radio frequency band specifically includes:
  • the first mixer receives the uplink radio frequency signal with the second radio frequency band sent by the second splitter.
  • the near-end signal receiving device further includes: a second signal generator, a second combiner, and a second mixer; the remote receiving device further includes: a third antenna, a second passive mixer, and a a splitter
  • the sending, by the first signal generator, the first local oscillator signal specifically includes:
  • the first signal generator sends the first local oscillator signal to the second combiner
  • the method further includes:
  • the second signal generator generates a second local oscillator signal and transmits the second local oscillator signal to the second combiner;
  • the second combiner receives the first local oscillator signal sent by the first signal generator and the second local oscillator signal sent by the second signal generator, and the first local oscillator signal The vibration signal and the second local oscillation signal are combined to form a first combined signal, and then sent to the first splitter via the passive DAS line;
  • the second passive mixer receives the second local oscillator signal sent by the first splitter and the third uplink radio frequency signal with the first radio frequency band sent by the third antenna, and utilizes The second local oscillator signal performs a mixing process on the third uplink radio frequency signal having the first radio frequency band to form an uplink radio frequency signal having a third radio frequency band, and then sends the uplink radio frequency signal to the first combiner;
  • the third radio frequency band and the second radio frequency band do not overlap each other;
  • the first combiner receives the uplink radio frequency signal with the third radio frequency band sent by the second passive mixer, and combines the uplink radio frequency signal with the third radio frequency band in the uplink radio frequency
  • the combined signal is sent to the second splitter via the passive DAS line;
  • the second splitter obtains the uplink radio frequency signal with the third radio frequency band and sends the uplink radio frequency signal to the second mixer;
  • the second mixer receives the uplink radio frequency signal with the third radio frequency band sent by the second splitter;
  • the second mixer performs a mixing process on the uplink radio frequency signal having the third radio frequency band by using the second local oscillator signal generated by the second signal generator to form the first radio frequency band. Sending a third uplink RF signal to the destination; or
  • an embodiment of the present invention provides a distributed antenna system and a signal transmission method, where the distributed antenna system includes: a near-end signal generating device, a passive DAS line, and a remote transmitting device;
  • the device includes: a first signal generator, the remote transmitting device comprising: a first passive mixer and a first antenna; and the received variable frequency signal is processed by a remote passive mixer.
  • a passive mixer is disposed at the remote transmitting device, and the local oscillator signal transmitted to the passive mixer by other devices is used for mixing processing, that is, the mixer itself is not required to be powered.
  • the local oscillator signal is generated, thereby avoiding the existing active mixer that is implemented to the DAS remote Power supply, resulting in difficult construction and high cost.
  • DAS distributed antenna system
  • FIG. 2 is a structural diagram of a DAS according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of another DAS according to an embodiment of the present disclosure.
  • FIG. 4 is a structural diagram of another DAS according to an embodiment of the present invention.
  • FIG. 5 is a structural diagram of another DAS according to an embodiment of the present invention.
  • FIG. 6 is a structural diagram of another DAS according to an embodiment of the present invention.
  • FIG. 7 is a structural diagram of another DAS according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of another signal transmission method according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of another signal transmission method according to an embodiment of the present invention.
  • FIG. 10 is a structural diagram of another DAS according to an embodiment of the present invention.
  • FIG. 11 is a structural diagram of another DAS according to an embodiment of the present invention.
  • the basic idea of the present invention is to provide a passive mixer at the remote antenna, and use the local oscillator signal transmitted from the other device to the passive mixer for mixing processing, that is, the mixer itself is not required to be powered.
  • the local oscillator signal is generated in the case, which avoids the problem of inconvenient construction caused by the far-end mixer when the local oscillator signal is generated.
  • the DAS may include: a near-end signal generating device 10, and a passive DAS line. 20 and the remote transmitting device 30; wherein the near-end signal generating device 10 is located at the ingress port of the passive DAS line 20, and the remote transmitting device 30 is located at the egress port of the passive DAS line 20.
  • the ingress port and the egress port described in the above are relative to the transmission direction of the downlink radio frequency signal, and do not limit the specific location of the device.
  • the near-end signal generating device 10 is configured to generate a signal, and is located in the equipment room, and may include: any device that generates a signal, and a device that performs mixing, combining, and the like on the generated signal, and may include a source and a first signal.
  • the generator 101; wherein the source may refer to any device that generates a signal, such as a macro base station, a micro base station, a repeater, a radio frequency unit (RRU), a pico base station, a pico RRU, and the like.
  • RRU radio frequency unit
  • the passive DAS line 20 is configured to transmit the signal generated by the near end to the indoor antenna, and transmit the signal to the user through the indoor antenna to be transmitted to the indoor, which may be a circuit including a device such as a coupler and a power splitter.
  • the remote transmitting device 30 is configured to transmit a signal, and is located at an indoor ceiling or the like, and may include: a first passive mixer 301 and a first antenna 302; wherein an ingress port of the first antenna 302 and the first The output port of the source mixer 301 is connected.
  • the first signal generator 101 is configured to generate a first local oscillator signal and send the first local oscillator signal to the first passive mixer 301.
  • the first passive mixer 301 is configured to receive the first local oscillator signal and a downlink radio frequency signal having a second radio frequency band.
  • the downlink radio frequency signal of the second radio frequency band is: a signal generated by mixing the first local oscillation signal with a first downlink radio frequency signal of the first radio frequency band sent by the source;
  • the first radio frequency band and the second radio frequency band do not overlap each other.
  • the first passive mixer 301 is further configured to perform a mixing process on the received downlink radio frequency signal having the second radio frequency band by using the first local oscillator signal to form the first radio frequency band.
  • the first downlink radio frequency signal is backward to the first antenna 302 send.
  • the mixing processing may be an up-conversion processing or a down-conversion processing; the up-conversion processing may refer to: adding a frequency band of the first local oscillation signal to a second radio frequency band, and performing downlink radio frequency signals. The frequency band is moved to a first radio frequency band higher than the second radio frequency band; the down conversion processing may be: subtracting the frequency band of the first local oscillator signal from the second radio frequency band, and moving the frequency band of the downlink radio frequency signal to On the first RF band lower than the second RF band.
  • the first antenna 302 is configured to transmit the received first downlink radio frequency signal having the first radio frequency band.
  • the downlink RF signal and the local oscillator signal after the near-end mixing process may be combined and transmitted to the first passive mixer 301 via the passive DAS line;
  • the near-end signal generating device 10 may include: a combiner 102 and a first mixer 103; the remote transmitting device 30 further includes: a splitter 303;
  • the first signal generator 101 is specifically configured to send the first local oscillator signal to the combiner 102, and after the combined processing by the combiner 102, the passive DAS line 20 is used to The first passive mixer 301 transmits;
  • the first mixer 103 is configured to receive the first downlink radio frequency signal with the first radio frequency band sent by the source;
  • the first mixer 103 may be a passive mixer, and may also be an active mixer; when the first mixer 103 is a passive mixer, the first mixing Device 103, may be further configured to perform mixing processing on the first downlink radio frequency signal by using the first local oscillator signal generated by the first signal generator, and the second radio frequency band generated after mixing The downlink radio frequency signal is sent to the combiner;
  • the first mixer 103 may further mix the first downlink RF signal by using a local oscillator signal generated by the first mixer. Frequency processing, sending the downlink radio frequency signal with the second radio frequency band generated after mixing to the combiner.
  • the near-end can also be used.
  • the first mixer 103 in the signal generating device generates a local oscillator signal, and transmits the local oscillator signal to the first passive mixer 301, that is, the first passive mixer 301, which can also be used
  • the local oscillator signal generated by the first mixer 103 is received.
  • the local oscillator signal has the same function as the first local oscillator signal.
  • the downlink radio frequency signal with the second radio frequency band may be a signal suitable for transmission by the passive DAS line, that is, when the converted downlink radio frequency signal with the second radio frequency band is transmitted through the passive DAS line.
  • the attenuation is smaller than the attenuation when the first downlink radio frequency signal is transmitted through the passive DAS line, so that the fading during signal transmission is reduced, and the transmission distance of the signal is increased.
  • S2 is a high-frequency signal
  • S3 is a signal that is more suitable for transmission on a passive DAS line after frequency conversion.
  • the combiner 102 is configured to receive the downlink radio frequency signal having the second radio frequency band and the first local oscillator signal, and receive the downlink radio frequency signal with the second radio frequency band and the first The local oscillator signal is combined to form a downlink RF combining signal and then transmitted to the splitter through the passive DAS line.
  • the splitter 303 is configured to receive the downlink radio frequency combining signal, separate the received signal included in the downlink radio frequency combining signal, acquire a downlink radio frequency signal having the second radio frequency band, and the The first local oscillator signal is then sent to the first passive mixer.
  • the first passive mixer 301 receives the first local oscillator signal and a downlink radio frequency signal having a second radio frequency band, specifically receiving the first part sent by the splitter a local oscillator signal and the downlink radio frequency signal having the second radio frequency band.
  • the DAS provided by the embodiment of the present invention can also support the same-frequency dual-stream transmission to realize the expansion of the DAS system, for example, a downlink RF signal and a converted downlink RF signal can be combined and transmitted.
  • the remote transmitting device 30 further includes: a second antenna 304;
  • the combiner 102 is further configured to receive a second downlink radio frequency signal that is sent by the source and has a first radio frequency band, and combine the second downlink radio frequency signal into the downlink radio frequency combination signal to the The splitter sends.
  • the second downlink radio frequency combining signal may be a signal formed by combining the first downlink radio frequency signal and the original signal in the downlink radio frequency combining signal.
  • the splitter 303 is further configured to acquire the second downlink radio frequency signal having the first radio frequency band and send the second downlink radio frequency signal to the second antenna.
  • the second antenna 304 is configured to transmit the second downlink radio frequency signal with the first radio frequency band.
  • the two channels of the same frequency are transmitted through the DAS system, and the system capacity is provided compared with the existing DAS system that only supports single stream transmission.
  • the DAS provided by the embodiment of the present invention can also support the transmission of the multi-stream same-frequency signal, for example, after at least two of the same-frequency downlink RF signals are respectively subjected to the mixing processing.
  • the generating device 10 may further include: a second signal generator 104, a second mixer 105;
  • the remote transmitting device 30 may further include: a second passive mixer 305 and a third antenna 306;
  • the second signal generator 104 is configured to generate a second local oscillator signal, and send the second local oscillator signal to the combiner 102;
  • the second mixer 105 is configured to receive a third downlink radio frequency signal that is sent by the source and has a first radio frequency band.
  • the second mixer 105 is further configured to receive the second signal generator to send
  • the second local oscillation signal is used to perform a mixing process on the third downlink radio frequency signal having the first radio frequency band by using the second local oscillation signal to form a downlink radio frequency signal having a third radio frequency band, and then The router sends; or,
  • the third downlink radio frequency signal having the first radio frequency band is mixed and processed by using the local oscillator signal generated by the second mixer to form a downlink radio frequency signal having a third radio frequency band, and then sent to the combiner
  • the third radio frequency band and the first radio frequency band do not overlap each other.
  • the combiner 102 is further configured to receive the downlink radio frequency signal with the third radio frequency band and the second local oscillator signal sent by the second signal generator sent by the second mixer, and receive the The downlink radio frequency signal having the third radio frequency band and the second local oscillation signal are combined and sent to the splitter in the downlink radio frequency combining signal.
  • the downlink radio frequency signal having the third radio frequency band and the second local oscillation signal are combined in the downlink radio frequency combining signal, which may be referred to as:
  • the downlink radio frequency signal having the third radio frequency band, the second local oscillator signal, and the original signal in the downlink radio frequency combining signal are combined to form a downlink radio frequency combining signal.
  • the splitter 303 is further configured to: acquire the downlink radio frequency signal having the third radio frequency band and the second local oscillator signal, and send the signal to the second passive mixer.
  • the second passive mixer 305 is configured to perform a mixing process on the downlink radio frequency signal having the third radio frequency band by using the second local oscillator signal to form the third downlink having the first radio frequency band.
  • the radio frequency signal is then sent to the third antenna.
  • the third antenna 306 is configured to transmit the received third downlink radio frequency signal having the first radio frequency band.
  • the description in the foregoing embodiment of the present invention is an example in which DAS supports the same-frequency dual-stream processing, and does not exclude more than two (ie, multi-stream) intra-frequency uplink radio signals.
  • the processing of more than two uplink radio frequency signals should also be included in the technical solution described in this embodiment.
  • the DAS can simultaneously transmit multiple co-frequency signals, which greatly provides the system capacity of the DAS.
  • the DAS may further include: a near-end signal receiving device 40, a passive DAS line 20, and a remote receiving device 50.
  • the near-end signal receiver 40 is located at the egress port of the passive DAS line 20, and the far-end receiving device 50 is located at the ingress port of the passive DAS line 20. It should be noted that the ingress port and the egress port are relative to the uplink radio frequency signal. Depending on the direction of transmission, it does not limit the specific location of the device.
  • the near-end signal receiving device 40 is configured to receive a signal, and is located in the equipment room, and may include: any device that receives the signal, and a device that performs mixing, combining, and the like on the received signal, and may include a sink and a first signal.
  • RRU radio frequency unit
  • the passive DAS line 20 is configured to transmit the signal generated by the near end to the indoor antenna, and transmit the signal to the user through the indoor antenna to be transmitted to the indoor, which may be a circuit including a device such as a coupler and a power splitter.
  • the remote receiving device 50 is configured to receive a signal, and is located at an indoor ceiling or the like, and may include: a first passive mixer 501 and a first antenna 502; wherein an outgoing port of the first antenna 502 and the first The ingress port of the source mixer 501 is connected.
  • the first signal generator 401 is configured to generate a first local oscillator signal, and send the first local oscillator signal to the first passive mixer through the passive DAS line;
  • the first antenna 502 is configured to receive a first uplink radio frequency signal having a first radio frequency band, and send the first uplink radio frequency signal having the first radio frequency band to the first passive mixer.
  • the first passive mixer 501 is configured to receive the first local oscillator signal, and use the received first local oscillator signal to mix the first uplink radio frequency signal having the first radio frequency band. Frequency processing to form an uplink RF signal having a second RF band Transmitting to the first mixer through the passive DAS line.
  • the first mixer 402 is configured to receive the uplink radio frequency signal with a second radio frequency band
  • the first mixer 402 is further configured to perform a mixing process on the received uplink radio frequency signal having the second radio frequency band by using the first local oscillator signal generated by the first signal generator to form the The first uplink radio frequency signal having the first radio frequency band is sent to the sink; or
  • the DAS provided by the embodiment of the present invention can also support the same-frequency dual-stream transmission to realize the expansion of the DAS system, for example, an uplink RF signal and a frequency-converted uplink RF signal can be combined and transmitted.
  • the remote receiving device 50 further includes: a second antenna 503, a first combiner 505;
  • the near-end signal receiving device 40 further includes: a second splitter 405;
  • the second antenna 503 is configured to receive a second uplink radio frequency signal having a first radio frequency band, and send the second uplink radio frequency signal having the first radio frequency band to the first combiner 505.
  • the first passive mixer 501 is specifically configured to send the uplink radio frequency signal with the second radio frequency band to the first combiner 505.
  • the first combiner 505 is configured to receive, by the second antenna, the second uplink radio frequency signal with the first radio frequency band and the first passive mixer 501
  • the uplink radio frequency signal of the second radio frequency band is combined with the second uplink radio frequency signal having the first radio frequency band and the uplink radio frequency signal having the second radio frequency band to form an uplink radio frequency combining signal, and then Passing a passive DAS line to the second splitter; the first radio frequency band and the second radio frequency band do not overlap each other;
  • the second splitter 405 is configured to receive the uplink radio frequency combining signal, and separate the received signal in the uplink radio frequency combining signal to obtain the first shot.
  • the second uplink radio frequency signal of the frequency band is sent to the sink, and the uplink radio frequency signal with the second radio frequency band is obtained and sent to the first mixer 402.
  • the first mixer 402 is configured to receive the uplink radio frequency signal with the second radio frequency band sent by the second splitter.
  • the DAS provided by the embodiment of the present invention can also support the transmission of the multi-stream same-frequency signal, for example, after at least two uplink-frequency RF signals of the same frequency are separately subjected to mixing processing.
  • Forming signals having different frequency bands and combining them to be sent to the near-end sink specifically, as shown in FIG. 7, the near-end signal receiving device further includes: a second signal generator 404, a second combiner 406, a second mixer 403; the remote receiving device further includes: a third antenna 507, a second passive mixer 503, a first splitter 506506;
  • the second signal generator 404 is configured to generate a second local oscillator signal, and send the second local oscillator signal to the second combiner 406;
  • the first signal generator 401 is specifically configured to send the first local oscillator signal to the second combiner 406;
  • the second combiner 406 is configured to receive the first local oscillator signal sent by the first signal generator 401 and the second local oscillator signal sent by the second signal generator 404, and Combining the first local oscillator signal and the second local oscillator signal to form a first combined signal and transmitting the first combined signal to the first splitter 506506 via the passive DAS line;
  • the first splitter 506506 is configured to receive the first combined signal, separate the signal in the first combined signal, and obtain the first local oscillator signal to the first passive
  • the mixer 501 transmits, acquires the second local oscillator signal, and sends the second local oscillator signal to the second passive mixer 503.
  • the first passive mixer 501 is specifically configured to receive the first local oscillator signal sent by the first splitter 506506;
  • the third antenna 507 is configured to receive a third uplink radio frequency signal having a first radio frequency band, and send the third uplink radio frequency signal having the first radio frequency band to the second passive mixer 503.
  • the second passive mixer 503 is configured to receive the second local oscillator signal sent by the first splitter 506506, and the first radio frequency band sent by the third antenna 507
  • the third uplink RF signal is used to perform a mixing process on the third uplink radio frequency signal having the first radio frequency band by using the second local oscillator signal to form an uplink radio frequency signal having a third radio frequency band, and then to the first combined path And sending, by the device 505, the third radio frequency band and the second radio frequency band do not overlap each other;
  • the first combiner 505 is further configured to receive the uplink radio frequency signal with the third radio frequency band sent by the second passive mixer 503, and combine the uplink radio frequency signal with the third radio frequency band Transmitting, in the uplink RF combining signal, the passive DAS line to the second splitter;
  • the second splitter 405 is further configured to obtain the uplink radio frequency signal with the third radio frequency band and send the signal to the second mixer 403.
  • the second mixer 403 is configured to receive the uplink radio frequency signal that is sent by the second splitter and has a third radio frequency band.
  • the second mixer 403 is further configured to perform mixing processing on the uplink radio frequency signal having the third radio frequency band by using the second local oscillator signal generated by the second signal generator 404 to form the The third uplink radio frequency signal having the first radio frequency band is sent to the destination; or
  • the description in the foregoing embodiment of the present invention is an example in which DAS supports the same-frequency dual-stream processing, and does not exclude more than two (ie, multi-stream) intra-frequency uplink radio signals.
  • the processing of more than two uplink radio frequency signals should also be included in the technical solution described in this embodiment.
  • the DAS can simultaneously transmit multiple co-frequency signals, which greatly provides the system capacity of the DAS.
  • the distributed antenna system DAS provided by the embodiment of the present invention may be applied to a wireless communication network, where the wireless communication network may include the DAS, and may also include a user equipment served by the passive DAS.
  • the wireless communication network may include the DAS, and may also include a user equipment served by the passive DAS.
  • the numbers “ ⁇ ”, “ ⁇ ”, “ ⁇ ”, “ ⁇ ” are just for the sake of clear description or distinction, and do not represent the pros and cons of the scheme.
  • an embodiment of the present invention provides a distributed antenna system, including: a near-end signal generating device, a passive DAS line, and a remote transmitting device, wherein the near-end signal generating device includes: a source, a first signal generator; the remote transmitting device includes: a first passive mixer and a first antenna; the first signal generator for generating a first local oscillator signal and passing the passive DAS The line transmits the first local oscillator signal to the first passive mixer; the first passive mixer is configured to receive the first local oscillator signal and a downlink radio frequency having a second radio frequency band The first passive mixer is further configured to perform a mixing process on the received downlink radio frequency signal having the second radio frequency band by using the first local oscillator signal to form the first radio frequency The first downlink radio frequency signal of the frequency band is sent to the first antenna, and the first antenna is configured to transmit the received first downlink radio frequency signal with the first radio frequency band.
  • the near-end signal generating device includes: a source, a first signal generator
  • a passive mixer is disposed at the remote transmitting device, and the local oscillator signal transmitted to the passive mixer by other devices is used for mixing processing, that is, the mixer itself is not required to be powered.
  • the local oscillator signal the existing implementation of power supply to the active mixer of the DAS remote is avoided, resulting in a construction difficulty and a high cost.
  • FIG. 8 is a schematic diagram of a signal transmission method according to an embodiment of the present invention, which is implemented by a DAS according to Embodiment 1, a near-end signal generating device, a passive DAS line, and a remote transmitting device, wherein the near-end signal is
  • the generating device includes: a source, a first signal generator; the remote transmitting device includes: a first passive mixer and a first antenna; as shown in FIG. 8, the method may include:
  • Step 101 The first signal generator generates a first local oscillator signal, and sends the first local oscillator signal to the first passive mixer through the passive DAS line.
  • Step 102 The first passive mixer receives the first local oscillator signal and a downlink radio frequency signal having a second radio frequency band.
  • the downlink radio frequency signal of the second radio frequency band is: the first local oscillator signal is mixed with the first downlink radio frequency signal of the first radio frequency band sent by the source. Generating a signal; and the first radio frequency band and the second radio frequency band do not overlap each other;
  • the downlink radio frequency signal with the second radio frequency band may be a signal suitable for transmission by the passive DAS line, that is, the downlink radio frequency signal with the second radio frequency band is less than the attenuation when transmitted by the passive DAS line.
  • the attenuation of the first downlink radio frequency signal when transmitted through the passive DAS line is such that fading during signal transmission is reduced, and the transmission distance of the signal is increased.
  • Step 103 The first passive mixer performs a mixing process on the received downlink radio frequency signal with the second radio frequency band by using the first local oscillator signal to form the first lower radio frequency band.
  • the radio frequency signal is sent to the first antenna.
  • the mixing processing may be an up-conversion processing or a down-conversion processing; the up-conversion processing may refer to: adding a frequency band of the first local oscillation signal to a second radio frequency band, and performing downlink radio frequency signals. The frequency band is moved to a first radio frequency band higher than the second radio frequency band; the down conversion processing may be: subtracting the frequency band of the first local oscillator signal from the second radio frequency band, and moving the frequency band of the downlink radio frequency signal to On the first RF band lower than the second RF band.
  • Step 104 The first antenna transmits the received first downlink radio frequency signal having the first radio frequency band.
  • the downlink RF signal and the local oscillator signal after the near-end mixing process may be combined and transmitted through the passive DAS line to the first passive mixer
  • the near-end signal generating device may include: a first mixer and a combiner; the remote transmitting device further includes: a splitter;
  • the sending, by the first signal generator, the first local oscillator signal to the first passive mixer includes:
  • the first signal generator sends the first local oscillator signal to the combiner, and the first local oscillator signal is sent by the combiner to the first passive mixer;
  • the method further includes:
  • the first mixer receives the first downlink radio frequency signal with the first radio frequency band sent by the source;
  • the first mixer performs a mixing process on the first downlink radio frequency signal by using the first local oscillator signal generated by the first signal generator, and the second radio frequency generated after mixing
  • the downlink radio frequency signal of the frequency band is sent to the combiner; or
  • the splitter Receiving, by the splitter, the downlink radio frequency combining signal, separating the received signal included in the downlink radio frequency combining signal, acquiring a downlink radio frequency signal having the second radio frequency band, and the first local oscillator Sending a signal to the first passive mixer;
  • the receiving, by the first passive mixer, the first local oscillator signal and the downlink radio frequency signal having the second radio frequency band specifically include:
  • the first passive mixer receives the first local oscillator signal sent by the splitter and the downlink radio frequency signal with a second radio frequency band.
  • the DAS provided by the embodiment of the present invention can also support the same-frequency dual-stream transmission, for example, a downlink RF signal and a converted downlink RF signal can be combined and transmitted.
  • the remote transmitting device is specifically configured.
  • the method may further include: a second antenna; the method may further include:
  • the combiner receives a second downlink radio frequency signal that is sent by the source and has a first radio frequency band, and combines the second downlink radio frequency signal and sends the second downlink radio frequency signal to the splitter in the downlink radio frequency combination signal;
  • the splitter obtains the second downlink radio frequency signal with the first radio frequency band and sends the second downlink radio frequency signal to the second antenna;
  • the second antenna transmits the second downlink radio frequency signal with the first radio frequency band.
  • the combining the first downlink radio frequency signal into the downlink radio frequency combining signal to form the second downlink radio frequency combining signal may include: using the first downlink radio frequency signal and the downlink radio frequency The original signals in the combined signal are combined to form a second downlink RF combined signal.
  • the two channels of the same frequency are transmitted through the DAS system, and the system capacity is provided compared with the existing DAS system that only supports single stream transmission.
  • the DAS provided by the embodiment of the present invention can also support the transmission of the multi-stream same-frequency signal, for example, after at least two of the same-frequency downlink RF signals are respectively subjected to the mixing processing.
  • the signals are sent to the remote end, and the remote end is sent to the remote end according to the combined signal.
  • the remote end obtains the plurality of radio frequency signals, the remote end is transmitted through the multiple antennas.
  • the near-end signal generating device may further include: a second signal generator, the second mixer; the remote transmitting device further includes: a second passive mixer and a third antenna; the method may further include:
  • the second signal generator generates a second local oscillator signal and transmits the second local oscillator signal to the combiner;
  • the second mixer receives a third downlink radio frequency signal that is sent by the source and has a first radio frequency band;
  • the second mixer receives the second local oscillator signal sent by the second signal generator, and mixes the third downlink radio frequency signal with the first radio frequency band by using the second local oscillator signal Processing, forming a downlink radio frequency signal having a third radio frequency band, and transmitting the signal to the combiner; or
  • the third downlink radio frequency signal is subjected to a mixing process to form a downlink radio frequency signal having a third radio frequency band, and then sent to the combiner; wherein the third radio frequency band and the first radio frequency band do not overlap each other;
  • the combiner receives the downlink radio frequency signal with the third radio frequency band and the second local oscillator signal sent by the second signal generator sent by the second mixer, and the received The downlink radio frequency signal of the three radio frequency bands and the second local oscillator signal combination are sent to the splitter in the downlink radio frequency combining signal;
  • the second passive mixer performs a mixing process on the downlink radio frequency signal having the third radio frequency band by using the second local oscillator signal to form a third downlink radio frequency signal with the first radio frequency band. Transmitting in the third antenna;
  • the third antenna transmits the received third downlink radio frequency signal having the first radio frequency band.
  • One of the at least one third antenna transmits the received downlink radio frequency signal having the first radio frequency band.
  • the method for combining the received downlink radio frequency signal with the third radio frequency band and the second local oscillator signal in the downlink radio frequency combining signal to form the third downlink radio frequency combining signal may include: And receiving the received downlink radio frequency signal having the third radio frequency band, the second local oscillation signal, and the original signal in the downlink radio frequency combining signal to form a downlink radio frequency combining signal.
  • the description in the foregoing embodiment of the present invention is an example in which DAS supports the same-frequency dual-stream processing, and does not exclude more than two (ie, multi-stream) intra-frequency uplink radio signals.
  • the processing of more than two uplink radio frequency signals should also be included in the technical solution described in this embodiment.
  • the DAS can simultaneously transmit multiple co-frequency signals, which greatly provides the system capacity of the DAS.
  • FIG. 9 shows another signal transmission side provided by an embodiment of the present invention.
  • the method is performed by a distributed antenna system DAS, the DAS comprising: a near-end signal receiving device, a passive DAS line, and a remote receiving device, the near-end signal receiving device comprising: a sink, a first signal generator, and a first a mixer; the remote receiving device includes: a first passive mixer and a first antenna; as shown in FIG. 9, the method may include:
  • Step 201 The first signal generator generates a first local oscillator signal, and sends the first local oscillator signal to the first passive mixer through the passive DAS line.
  • Step 202 The first antenna receives the first uplink radio frequency signal having the first radio frequency band, and sends the first uplink radio frequency signal with the first radio frequency band to the first passive mixer.
  • Step 203 The first passive mixer receives the first local oscillator signal, and performs the mixing processing on the first uplink radio frequency signal having the first radio frequency band by using the received first local oscillator signal. Forming an uplink radio frequency signal having a second radio frequency band and transmitting the same to the first mixer through the passive DAS line.
  • Step 204 The first mixer receives the uplink radio frequency signal with the second radio frequency band, and uses the first local oscillator signal generated by the first signal generator to receive the received uplink radio frequency with the second radio frequency band.
  • the signal is subjected to a mixing process to form the first uplink radio frequency signal having the first radio frequency band, and then sent to the information sink; or
  • the DAS provided by the embodiment of the present invention can also support the same-frequency dual-stream transmission to realize the expansion of the DAS system, for example, an uplink RF signal and a frequency-converted uplink RF signal can be combined and transmitted.
  • the remote receiving device may further include: a second antenna, a first combiner; and the near-end signal receiving device may further include: a second splitter;
  • the sending, by the first passive mixer, the uplink radio frequency signal with the second radio frequency band to the first mixer includes:
  • the method further includes:
  • the first combiner will receive the second uplink radio frequency signal with the first radio frequency band and the second radio frequency band sent by the first passive mixer.
  • Upstream radio frequency signal combining the second uplink radio frequency signal having the first radio frequency band and the uplink radio frequency signal having the second radio frequency band to form an uplink radio frequency combining signal, and then passing through the passive DAS line Transmitting by the second splitter; the first radio frequency band and the second radio frequency band do not overlap each other;
  • the uplink radio frequency combining signal Receiving, by the second splitter, the uplink radio frequency combining signal, separating the received signal in the uplink radio frequency combining signal, acquiring the second uplink radio frequency signal having the first radio frequency band, and then performing the Sending to the sink, acquiring the uplink radio frequency signal with the second radio frequency band, and sending the signal to the first mixer;
  • the receiving, by the first mixer, the uplink radio frequency signal with the second radio frequency band specifically includes:
  • the first mixer receives the uplink radio frequency signal with the second radio frequency band sent by the second splitter.
  • the DAS provided by the embodiment of the present invention can also support the transmission of the multi-stream same-frequency signal, for example, after at least two uplink-frequency RF signals of the same frequency are separately subjected to mixing processing.
  • Forming signals having different frequency bands and combining them to be sent to the near-end sink in particular, the near-end signal receiving device may further include: a second signal generator, a second combiner, and a second mixer;
  • the remote receiving device may further include: a third antenna, a second passive mixer, and a first splitter;
  • the sending, by the first signal generator, the first local oscillator signal specifically includes:
  • the first signal generator sends the first local oscillator signal to the second combiner
  • the method further includes:
  • the second signal generator generates a second local oscillator signal and to the second combiner Transmitting the second local oscillator signal;
  • the second combiner receives the first local oscillator signal sent by the first signal generator and the second local oscillator signal sent by the second signal generator, and the first local oscillator signal The vibration signal and the second local oscillation signal are combined to form a first combined signal, and then sent to the first splitter via the passive DAS line;
  • the second passive mixer receives the second local oscillator signal sent by the first splitter and the third uplink radio frequency signal with the first radio frequency band sent by the third antenna, and utilizes The second local oscillator signal performs a mixing process on the third uplink radio frequency signal having the first radio frequency band to form an uplink radio frequency signal having a third radio frequency band, and then sends the uplink radio frequency signal to the first combiner;
  • the third radio frequency band and the second radio frequency band do not overlap each other;
  • the first combiner receives the uplink radio frequency signal with the third radio frequency band sent by the second passive mixer, and combines the uplink radio frequency signal with the third radio frequency band in the uplink radio frequency
  • the combined signal is sent to the second splitter via the passive DAS line;
  • the second splitter obtains the uplink radio frequency signal with the third radio frequency band and sends the uplink radio frequency signal to the second mixer;
  • the second mixer receives the uplink radio frequency signal with the third radio frequency band sent by the second splitter;
  • the second mixer performs a mixing process on the uplink radio frequency signal having the third radio frequency band by using the second local oscillator signal generated by the second signal generator to form the first radio frequency band. Sending a third uplink RF signal to the destination; or
  • the description in the foregoing embodiment of the present invention is an example in which DAS supports the same-frequency dual-stream processing, and does not exclude more than two (ie, multi-stream) intra-frequency uplink radio signals.
  • the processing of more than two uplink radio frequency signals should also be included in the technical solution described in this embodiment.
  • the DAS can simultaneously transmit multiple co-frequency signals, which greatly provides the system capacity of the DAS.
  • the distributed antenna system DAS provided by the embodiment of the present invention may be applied to a wireless communication network, where the wireless communication network may include the DAS, and may also include a user equipment served by the passive DAS.
  • the numerals "a”, “two", “three”, “four” and the like in the embodiments of the present application are merely for convenience of description or distinction, and do not represent the advantages and disadvantages of the scheme.
  • an embodiment of the present invention provides a signal transmission method, which is performed by a distributed antenna system DAS, where the DAS includes: a near-end signal generating device, a passive DAS line, and a remote transmitting device, wherein
  • the near-end signal generating device includes: a source, a first signal generator;
  • the remote transmitting device includes: a first passive mixer and a first antenna; and the first signal generator generates a first local oscillator signal, And transmitting, by the passive DAS line, the first local oscillator signal to the first passive mixer; the first passive mixer receiving the first local oscillator signal and having a second radio frequency a downlink radio frequency signal of the frequency band; the first passive mixer performs a mixing process on the received downlink radio frequency signal having the second radio frequency band by using the first local oscillator signal to form the first radio frequency
  • the first downlink radio frequency signal of the frequency band is sent to the first antenna, and the first antenna transmits the received first downlink radio frequency signal with the first radio frequency band.
  • a passive mixer is disposed at the remote transmitting device, and the local oscillator signal transmitted to the passive mixer by other devices is used for mixing processing, that is, the mixer itself is not required to be powered.
  • the local oscillator signal the existing implementation of power supply to the active mixer of the DAS remote is avoided, resulting in a construction difficulty and a high cost.
  • FIG. 10 is a structural diagram of a distributed antenna system DAS according to an embodiment of the present invention, for performing the method described in Embodiment 2.
  • the distributed antenna system DAS may include: 1001, communication unit 1002, transceiver 1003, memory 1004, passive DAS line 1005; the passive DAS line 1005 is used to implement the connection and mutual communication between these devices;
  • the processor 1001 may be a central processing unit (English: central processing unit, referred to as CPU).
  • the memory 1004 may be a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviation: RAM); or a non-volatile memory (English: non-volatile memory), for example Read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English: solid-state drive, abbreviation :SSD); or a combination of memories of the above kind and providing instructions and data to the processor 1001.
  • volatile memory such as a random access memory (English: random-access memory, abbreviation: RAM); or a non-volatile memory (English: non-volatile memory), for example Read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English: solid-state drive, abbreviation
  • the communication unit 1002 is configured to receive a first local oscillator signal and a downlink radio frequency signal having a second radio frequency band.
  • the downlink radio frequency signal of the second radio frequency band is: a signal generated by mixing the first local oscillation signal with a first downlink radio frequency signal of the first radio frequency band sent by the source;
  • the first radio frequency band and the second radio frequency band do not overlap each other;
  • the downlink radio frequency signal with the second radio frequency band may be a signal suitable for transmission by the passive DAS line, that is, the downlink radio frequency signal with the second radio frequency band is less than the attenuation when transmitted by the passive DAS line.
  • the attenuation of the first downlink radio frequency signal when transmitted through the passive DAS line is such that fading during signal transmission is reduced, and the transmission distance of the signal is increased.
  • the processor 1001 is configured to perform mixing processing on the downlink radio frequency signal with the second radio frequency band by using the first local oscillator signal received by the communication unit 1002 to form a first radio frequency band.
  • a downlink radio frequency signal wherein the downlink radio frequency signal of the second radio frequency band is: the first local oscillator signal and the first radio signal The signal generated after the first downlink RF signal of the frequency band is mixed; the first radio frequency band and the second radio frequency band do not overlap each other.
  • the mixing processing may be an up-conversion processing or a down-conversion processing; the up-conversion processing may refer to: adding a frequency band of the first local oscillation signal to a second radio frequency band, and performing downlink radio frequency signals. The frequency band is moved to a first radio frequency band higher than the second radio frequency band; the down conversion processing may be: subtracting the frequency band of the first local oscillator signal from the second radio frequency band, and moving the frequency band of the downlink radio frequency signal to On the first RF band lower than the second RF band.
  • the transceiver 1003 is configured to transmit the first downlink radio frequency signal having the first radio frequency band.
  • the communication unit 1002 is further configured to: before the receiving, by the communication unit 1002, the downlink radio frequency signal having the second radio frequency band, receive the first downlink radio frequency signal having the first radio frequency band;
  • the processor 1001 is further configured to perform a mixing process on the first downlink radio frequency signal received by the communication unit 1002 to form the downlink radio frequency signal having the second radio frequency band;
  • the communication unit 1002 is further configured to combine the downlink radio frequency signal having the second radio frequency band formed by the processor 1001 and the first local oscillation signal to form a downlink radio frequency combining signal;
  • the processor 1001 is further configured to separate signals in the downlink radio frequency combining signal formed by the communication unit 1002, and obtain the downlink with the second radio frequency band. a radio frequency signal and the first local oscillator signal.
  • the DAS provided by the embodiment of the present invention can also support the same-frequency dual-stream transmission.
  • the downlink radio frequency signal and the down-converted radio frequency signal can be combined and transmitted.
  • the communication unit 1002 And a second downlink radio frequency signal having a first radio frequency band, and combining the second downlink radio frequency signal having the first radio frequency band in the downlink radio frequency combining signal;
  • the processor 1001 is further configured to acquire the second downlink radio frequency signal having the first radio frequency band according to the downlink radio frequency combining signal;
  • the transceiver 1003 is further configured to transmit the second downlink radio frequency signal having the first radio frequency band.
  • the combining the first downlink radio frequency signal into the downlink radio frequency combining signal to form the second downlink radio frequency combining signal may include: using the first downlink radio frequency signal and the downlink radio frequency The original signals in the combined signal are combined to form a second downlink RF combined signal.
  • the two channels of the same frequency are transmitted through the DAS system, and the system capacity is provided compared with the existing DAS system that only supports single stream transmission.
  • the DAS provided by the embodiment of the present invention can also support the transmission of the multi-stream same-frequency signal, for example, after at least two of the same-frequency downlink RF signals are respectively subjected to the mixing processing.
  • the signals are formed in different frequency bands and then combined and sent to the remote end.
  • the remote end obtains a plurality of radio frequency signals according to the combined signal, and then transmits the signals through multiple antennas.
  • the communication unit 1002 is further configured to receive the first a second local oscillator signal and a third downlink radio frequency signal having a first radio frequency band;
  • the processor 1001 is further configured to perform a mixing process on the third downlink radio frequency signal with the first radio frequency band received by the communication unit 1002 to form a downlink radio frequency signal having a third radio frequency band;
  • the third radio frequency band and the first radio frequency band do not overlap each other;
  • the communication unit 1002 is further configured to combine the downlink radio frequency signal having the third radio frequency band and the second local oscillation signal into the downlink radio frequency combining signal;
  • the processor 1001 is further configured to acquire the foregoing according to the downlink radio frequency combining signal a downlink radio frequency signal having a third radio frequency band and the second local oscillation signal; performing a mixing process on the downlink radio frequency signal having the third radio frequency band by using the second local oscillation signal to form the first radio frequency The third downlink radio frequency signal of the frequency band;
  • the transceiver 1003 is further configured to transmit the third downlink radio frequency signal having the first radio frequency band.
  • the method for combining the received downlink radio frequency signal with the third radio frequency band and the second local oscillator signal in the downlink radio frequency combining signal to form the third downlink radio frequency combining signal may include: And receiving the received downlink radio frequency signal having the third radio frequency band, the second local oscillation signal, and the original signal in the downlink radio frequency combining signal to form a downlink radio frequency combining signal.
  • the description in the foregoing embodiment of the present invention is an example in which DAS supports the same-frequency dual-stream processing, and does not exclude more than two (ie, multi-stream) intra-frequency uplink radio signals.
  • the processing of more than two uplink radio frequency signals should also be included in the technical solution described in this embodiment.
  • the DAS can simultaneously transmit multiple co-frequency signals, which greatly provides the system capacity of the DAS.
  • FIG. 11 is a structural diagram of a distributed antenna system DAS according to an embodiment of the present invention, which is used to perform the method described in Embodiment 2.
  • the distributed antenna system DAS may include a processor 1101, a communication unit 1102, a transceiver 1103, a memory 1104, and a passive DAS line 1105; the passive DAS line 1105 is used to implement connection and mutual communication between the devices;
  • the processor 1101 may be a central processing unit (English: central processing unit, referred to as CPU).
  • the memory 1104 may be a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviation: RAM); or a non-volatile memory (English: non-volatile memory), for example Read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: Flash memory), hard disk (English: hard disk drive, abbreviated: HDD) or solid state drive (English: solid-state drive, abbreviated: SSD); or a combination of the above types of memory, and provides instructions and data to the processor 1101.
  • volatile memory such as a random access memory (English: random-access memory, abbreviation: RAM); or a non-volatile memory (English: non-volatile memory), for example Read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: Flash memory), hard disk (English: hard disk drive, abbreviated: HDD) or solid state drive (English: solid-state drive, abbreviated: SSD
  • the communication unit 1102 is configured to receive a first local oscillation signal, and send the first local oscillation signal to the transceiver 1103.
  • the transceiver 1103 is configured to receive a first uplink radio frequency signal having a first radio frequency band, and perform a mixing process on the first uplink radio frequency signal having the first radio frequency band by using the first local oscillator signal to form a first uplink radio frequency signal.
  • the processor 1101 is configured to perform a mixing process on the uplink radio frequency signal with the second radio frequency band formed by the transceiver 1103 to form the first uplink radio frequency signal having the first radio frequency band.
  • the DAS provided by the embodiment of the present invention can also support the same-frequency dual-stream transmission to realize the expansion of the DAS system, for example, an uplink RF signal and a frequency-converted uplink RF signal can be combined and transmitted.
  • the transceiver 1103 is further configured to receive a second uplink radio frequency signal having a first radio frequency band, and the second uplink radio frequency signal having the first radio frequency band and the uplink with the second radio frequency band The RF signal is combined to form an uplink RF combined signal; wherein the first RF band and the second RF band do not overlap each other;
  • the processor 1101 is further configured to separate signals in the uplink radio frequency combining signals received by the transceiver 1103, and acquire the second uplink radio frequency signals and the first radio frequency band.
  • the DAS provided by the embodiment of the present invention can also support the transmission of the multi-stream same-frequency signal, for example, after at least two uplink-frequency RF signals of the same frequency are separately subjected to mixing processing. Forming signals having different frequency bands and combining them to be sent to the near-end sink; in particular, the communication unit 1102 is further configured to receive the second local oscillator signal, and send the second local oscillator to the transceiver 1103. signal;
  • the transceiver 1103 is further configured to receive a third uplink radio frequency signal having a first radio frequency band, and perform a mixing process on the third uplink radio frequency signal having the first radio frequency band by using the second local oscillator signal, Forming an upstream RF signal with a third RF band No. the third radio frequency band and the second radio frequency band do not overlap each other;
  • the transceiver 1103 is further configured to combine the uplink radio frequency signal having the third radio frequency band into the uplink radio frequency combining signal;
  • the processor 1101 is further configured to separate signals in the uplink radio frequency combining signal to obtain the uplink radio frequency signal having the third radio frequency band;
  • the processor 1101 is further configured to perform a mixing process on the uplink radio frequency signal having the third radio frequency band to form the third uplink radio frequency signal having the first radio frequency band.
  • the description in the foregoing embodiment of the present invention is an example in which DAS supports the same-frequency dual-stream processing, and does not exclude more than two (ie, multi-stream) intra-frequency uplink radio signals.
  • the processing of more than two uplink radio frequency signals should also be included in the technical solution described in this embodiment.
  • the DAS can simultaneously transmit multiple co-frequency signals, which greatly provides the system capacity of the DAS.
  • the distributed antenna system DAS provided by the embodiment of the present invention may be applied to a wireless communication network, where the wireless communication network may include the DAS, and may also include a user equipment served by the passive DAS.
  • the numerals "a”, “two", “three”, “four” and the like in the embodiments of the present application are merely for convenience of description or distinction, and do not represent the advantages and disadvantages of the scheme.
  • an embodiment of the present invention provides a DAS, including: a processor, a communication unit, and a transceiver; the communication unit is configured to receive a first local oscillator signal and a downlink radio frequency signal having a second radio frequency band; a processor, configured to perform a mixing process on the downlink radio frequency signal with the second radio frequency band by using the first local oscillator signal received by the communication unit to form a first downlink radio frequency signal having a first radio frequency band
  • the downlink radio frequency signal of the second radio frequency band is: a signal generated after the first local oscillation signal is mixed with the first downlink radio frequency signal having the first radio frequency band; the first radio frequency band And the second radio frequency band does not overlap with each other; the transceiver is configured to transmit the first downlink radio frequency signal having the first radio frequency band.
  • a passive mixer is disposed at the remote transmitting device, and the local oscillator signal transmitted to the passive mixer by other devices is used for mixing processing, that is, the mixer itself is not required to be supplied.
  • the local oscillator signal is generated in the case of electricity, thereby avoiding the problem that the existing implementation supplies power to the active mixer at the remote end of the DAS, resulting in difficulty in construction and high cost.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate devices may or may not be physically separated, and the devices displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the software functional units described above are stored in a storage medium and include instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform portions of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, and the program code can be stored. Medium.
  • the program may be stored in a computer readable storage medium, which may include: a read only memory, a random access memory, a magnetic disk or an optical disk, and the like.

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Abstract

本发明公开了一种分布式天线系统及信号传输方法,涉及通信技术领域,以解决现有实现向DAS远端的有源混频器供电,导致的施工难度大、成本高的问题。本发明提供的DAS包括:信源、第一信号发生器;第一无源混频器以及第一天线;第一信号发生器,用于产生第一本振信号,并通过无源DAS线路向第一无源混频器发送第一本振信号;第一无源混频器,用于接收第一本振信号、以及具有第二射频频段的下行射频信号;第一无源混频器,还用于利用第一本振信号对接收到的具有第二射频频段的下行射频信号进行混频处理,形成具有第一射频频段的第一下行射频信号后向第一天线发送;第一天线,用于将接收到的具有第一射频频段的第一下行射频信号发射出去。

Description

一种分布式天线系统及信号传输方法
本申请要求于2015年06月29日提交中国专利局、申请号为201510368765.5、发明名称为“一种分布式天线系统及信号传输方法”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域,尤其涉及一种分布式天线系统及信号传输方法。
背景技术
为了解决室内覆盖问题,当前大部分城市的室内建筑物(如商场、电影院、体育馆、企业大型办公场所等)都部署有分布式天线系统(Distributed Antenna System,简称DAS)。其中,随着室内业务总量的不断设置,很多运营商亟需对现有DAS系统进行扩容。
目前,通常通过在DAS系统上传输双流或多流信号来提高DAS系统的系统容量,如在近端将基站发送的多路信号进行变频处理,形成具有不同频段的信号通过DAS线路传输至远端天线,在远端天线处将这些不同频段的信号解调处理通过多个天线发射出去,实现多路信号的传输,以此来扩大DAS系统的容量。
例如,图1为现有DAS传输两路信号的示意图;如图1所示,在近端设置一混频器和分路/合路器,利用混频器对其中一原路信号进行混频处理,形成与原信号S1不同的信号S2后传输至分路/合理器,由分路/合路器将另一原信号和混频后产生的信号S2合路后通过DAS线路发送至远端;远端设置有分路/合路器、有源混频器以及多个天线,分路/合路器接收DAS发送的信号后,过滤出原信号S1和变频后的信号S2,将原信号通过一天线发射出去,将信号S2发送至有源混频器,经有源混频器处理恢复成原信号S1后通过另一天线发射出去,以此实现双流传输,提供系统容量。
但是,现有DAS系统远端设置的混频器通常为有源混频器,需要近端的供电单元对其供电(如图1所示),而现有DAS中的DAS线路不能传输电信号,此时,若要实现传输电信号,则需要对现有DAS线路上的器件进行改造(如更换为有源器件)或者重新铺设电缆以便供电设备供电给有源混频器;然而,由于DAS线路上的无源器件均部署在室内天花板离等特殊位置,且供电单元位于机房内,与有源混频器距离较远,因此,对现有DAS线路上的器件进行改造(如更换为有源器件)或者铺设电缆的方式,会造成施工难度大、成本高的问题。
发明内容
为解决上述问题,本发明对现有DAS的传输架构进行了创新,提出了一种分布式天线系统及信号传输方法,以解决现有实现向DAS远端的有源混频器供电,导致的施工难度大、成本高的问题。
本发明的实施例采用如下技术方案:
第一方面,本发明实施例提供一种分布式天线系统DAS,包括:近端信号产生设备、无源DAS线路以及远端发射设备,所述近端信号产生设备包括:信源、第一信号发生器;所述远端发射设备包括:第一无源混频器以及第一天线;
所述第一信号发生器,用于产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;
所述第一无源混频器,用于接收所述第一本振信号、以及具有第二射频频段的下行射频信号;
所述第一无源混频器,还用于利用所述第一本振信号对接收到的所述具有第二射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第一下行射频信号后向所述第一天线发送;
所述第一天线,用于将接收到的所述具有第一射频频段的第一下行射频信号发射出去。
在第一方面的第一种可实现方式中,结合第一方面,
所述近端信号产生设备还包括:第一混频器以及合路器;所述 远端发射设备还包括:所述分路器;
所述第一混频器,用于接收所述信源发出的所述具有第一射频频段的第一下行射频信号;
所述第一混频器,还用于利用所述第一信号发生器产生的所述第一本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;或者,
利用所述第一混频器产生的本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;
所述第一信号发生器,具体用于向所述合路器发送所述第一本振信号;
所述合路器,用于接收所述具有第二射频频段的下行射频信号和所述第一本振信号,将接收到的所述具有第二射频频段的下行射频信号和所述第一本振信号进行合路,形成下行射频合路信号后通过所述无源DAS线路向所述分路器发送;
所述分路器,用于接收所述下行射频合路信号,将接收到的所述下行射频合路信号中包含的信号分离,获取具有所述第二射频频段的下行射频信号和所述第一本振信号后向所述第一无源混频器发送;
所述第一无源混频器接收所述第一本振信号、以及具有第二射频频段的下行射频信号,具体为接收所述分路器发送的所述第一本振信号、以及所述具有第二射频频段的下行射频信号。
在第一方面的第二种可实现方式中,结合第一方面的第一种可实现方式,所述远端发射设备还包括:第二天线;
所述合路器,还用于接收所述信源发出的具有第一射频频段的第二下行射频信号,将所述第二下行射频信号合路在所述下行射频合路信号内向所述分路器发送;
所述分路器,还用于获取所述具有第一射频频段的第二下行射 频信号后向所述第二天线发送;
所述第二天线,用于将接收到所述具有第一射频频段的第二下行射频信号发射出去。
在第一方面的第三种可实现方式中,结合第一方面的第一种可实现方式或第一方面的第二种可实现方式,
所述近端信号产生设备还包括:第二信号发生器、第二混频器;所述远端发射设备还包括:第二无源混频器和第三天线;
所述第二信号发生器,用于产生第二本振信号,并向所述合路器发送所述第二本振信号;
所述第二混频器,用于接收所述信源发出的具有第一射频频段的第三下行射频信号;
所述第二混频器,还用于接收所述第二信号发生器发送的所述第二本振信号,利用所述第二本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;或者,
利用所述第二混频器产生的本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;其中,所述第三射频频段与所述第一射频频段互不重叠;
所述合路器,还用于接收所述第二混频器发送的所述具有第三射频频段的下行射频信号和所述第二信号发生器发送的第二本振信号,将接收到的所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号内向所述分路器发送;
所述分路器,还用于获取所述具有第三射频频段的下行射频信号和所述第二本振信号后向所述第二无源混频器中发送;
所述第二无源混频器,用于利用所述第二本振信号对所述具有第三射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第三下行射频信号后向所述第三天线中发送;
所述第三天线,用于将接收到的所述具有第一射频频段的第三 下行射频信号发射出去。
第二方面,本发明实施例提供一种分布式天线系统DAS,包括:近端信号接收设备、无源DAS线路以及远端接收设备,所述近端信号接收设备包括:信宿、第一信号发生器、第一混频器;所述远端接收设备包括:第一无源混频器以及第一天线;
所述第一信号发生器,用于产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;
所述第一天线,用于接收具有第一射频频段的第一上行射频信号,并向所述第一无源混频器发送所述具有第一射频频段的第一上行射频信号;
所述第一无源混频器,用于接收所述第一本振信号,利用接收到的所述第一本振信号,对所述具有第一射频频段的第一上行射频信号进行混频处理,形成具有第二射频频段的上行射频信号后通过所述无源DAS线路向所述第一混频器发送;
所述第一混频器,用于接收所述具有第二射频频段的上行射频信号;
所述第一混频器,还用于利用所述第一信号发生器产生的第一本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送;或者,
利用所述第一混频器产生的本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送。
在第二方面的第一种可实现方式中,结合第二方面,所述远端接收设备还包括:第二天线、第一合路器;所述近端信号接收设备还包括:第二分路器;
所述第二天线,用于接收具有第一射频频段的第二上行射频信号,并向所述第一合路器发送所述具有第一射频频段的第二上行射频信号;
所述第一无源混频器,具体用于向所述第一合路器发送所述具有第二射频频段的上行射频信号;
所述第一合路器,用于将接收所述第二天线发送的所述具有第一射频频段的第二上行射频信号、以及所述第一无源混频器发送的所述具有第二射频频段的上行射频信号,将所述具有第一射频频段的第二上行射频信号和所述具有第二射频频段的上行射频信号进行合路处理,形成上行射频合路信号后通过所述无源DAS线路向所述第二分路器发送;所述第一射频频段与所述第二射频频段互不重叠;
所述第二分路器,用于接收所述上行射频合路信号,将接收到的所述上行射频合路信号中的信号分离,获取所述具有第一射频频段的第二上行射频信号后向所述信宿发送,获取所述具有第二射频频段的上行射频信号后向所述第一混频器发送;
所述第一混频器,具体用于接收所述第二分路器发送的所述具有第二射频频段的上行射频信号。
在第二方面的第第二种可实现方式中,结合第二方面的第一种可实现方式或第二方面的第二种可实现方式,
所述近端信号接收设备还包括:第二信号发生器、第二合路器、第二混频器;所述远端接收设备还包括:第三天线、第二无源混频器、第一分路器;
所述第二信号发生器,用于产生第二本振信号,并向所述第二合路器发送所述第二本振信号;
所述第一信号发生器,具体用于向所述第二合路器发送所述第一本振信号;
所述第二合路器,用于接收所述第一信号发生器发送的所述第一本振信号、以及所述第二信号发生器发送的所述第二本振信号,并对所述第一本振信号和所述第二本振信号进行合路处理,形成第一合路信号后经所述无源DAS线路向所述第一分路器发送;
所述第一分路器,用于接收所述第一合路信号,将所述第一合路信号中的信号分离出来,获取所述第一本振信号后向所述第一无 源混频器发送,获取所述第二本振信号后向所述第二无源混频器发送;
所述第一无源混频器,具体用于接收所述第一分路器发送的所述第一本振信号;
所述第三天线,用于接收具有第一射频频段的第三上行射频信号,并向所述第二无源混频器发送所述具有第一射频频段的第三上行射频信号;
所述第二无源混频器,用于接收所述第一分路器发送的所述第二本振信号、以及所述第三天线发送的所述具有第一射频频段的第三上行射频信号,利用所述第二本振信号对所述具有第一射频频段的第三上行射频信号进行混频处理,形成具有第三射频频段的上行射频信号后向所述第一合路器发送;其中,所述第三射频频段与所述第二射频频段互不重叠;
所述第一合路器,还用于接收所述第二无源混频器发送的所述具有第三射频频段的上行射频信号,将所述具有第三射频频段的上行射频信号合路在所述上行射频合路信号内经所述无源DAS线路向所述第二分路器发送;
所述第二分路器,还用于获取所述具有第三射频频段的上行射频信号后向所述第二混频器发送;
所述第二混频器,用于接收所述第二分路器发送的所述具有第三射频频段的上行射频信号;
所述第二混频器,还用于利用所述第二信号发生器产生的所述第二本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送;或者,
利用所述第二混频器产生的本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送。
第三方面,本发明实施例提供一种信号传输方法,由分布式天 线系统DAS执行,所述DAS包括:近端信号产生设备、无源DAS线路以及远端发射设备,所述近端信号产生设备包括:信源、第一信号发生器;所述远端发射设备包括:第一无源混频器以及第一天线;所述方法包括:
所述第一信号发生器产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;
所述第一无源混频器接收所述第一本振信号、以及具有第二射频频段的下行射频信号;
所述第一无源混频器利用所述第一本振信号对接收到的所述具有第二射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第一下行射频信号后向所述第一天线发送;
所述第一天线将接收到的所述具有第一射频频段的第一下行射频信号发射出去。
在第三方面的第一种可实现方式中,结合第三方面,
所述近端信号产生设备还包括:第一混频器以及合路器;所述远端发射设备还包括:分路器;
所述第一信号发生器向所述第一无源混频器发送所述第一本振信号具体包括:
所述第一信号发生器向所述合路器发送所述第一本振信号,由所述合路器向所述第一无源混频器发送所述第一本振信号;
在所述第一无源混频器接收具有第二射频频段的下行射频信号之前,所述方法还包括:
所述第一混频器接收所述信源发出的所述具有第一射频频段的第一下行射频信号;
所述第一混频器利用所述第一信号发生器产生的所述第一本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;或者,
利用所述第一混频器产生的本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频 信号向所述合路器发送;
所述合路器接收所述具有第二射频频段的下行射频信号和所述第一本振信号,将接收到的所述具有第二射频频段的下行射频信号和所述第一本振信号进行合路,形成下行射频合路信号后通过所述无源DAS线路向所述分路器发送;
所述分路器接收所述下行射频合路信号,将接收到的所述下行射频合路信号中包含的信号分离,获取具有所述第二射频频段的下行射频信号和所述第一本振信号后向所述第一无源混频器发送;
所述第一无源混频器接收所述第一本振信号、以及具有第二射频频段的下行射频信号具体包括:
所述第一无源混频器接收所述分路器发送的所述第一本振信号、以及所述具有第二射频频段的下行射频信号。
在第三方面的第二种可实现方式中,结合第三方面的第一种可实现方式,所述远端发射设备还包括:第二天线;所述方法还包括:
所述合路器接收所述信源发出的具有第一射频频段的第二下行射频信号,将所述第二下行射频信号合路在所述下行射频合路信号内向所述分路器发送;
所述分路器获取所述具有第一射频频段的第二下行射频信号后向所述第二天线发送;
所述第二天线将接收到所述具有第一射频频段的第二下行射频信号发射出去。
在第三方面的第三种可实现方式中,结合第三方面的第一种可实现方式或第三方面的第二种可实现方式,所述近端信号产生设备还包括:第二信号发生器、第二混频器;所述远端发射设备还包括:第二无源混频器和第三天线;所述方法还包括:
所述第二信号发生器产生第二本振信号,并向所述合路器发送所述第二本振信号;
所述第二混频器接收所述信源发出的具有第一射频频段的第三下行射频信号;
所述第二混频器接收所述第二信号发生器发送的所述第二本振信号,利用所述第二本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;或者,
利用所述第二混频器产生的本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;其中,所述第三射频频段与所述第一射频频段互不重叠;
所述合路器接收所述第二混频器发送的所述具有第三射频频段的下行射频信号和所述第二信号发生器发送的第二本振信号,将接收到的所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号内向所述分路器发送;
所述分路器获取所述具有第三射频频段的下行射频信号和所述第二本振信号后向所述第二无源混频器中发送;
所述第二无源混频器利用所述第二本振信号对所述具有第三射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第三下行射频信号后向所述第三天线中发送;
所述第三天线将接收到的所述具有第一射频频段的第三下行射频信号发射出去。
第四方面,本发明实施例提供一种信号传输方法,由分布式天线系统DAS执行,所述DAS包括:近端信号接收设备、无源DAS线路以及远端接收设备,所述近端信号接收设备包括:信宿、第一信号发生器、第一混频器;所述远端接收设备包括:第一无源混频器以及第一天线;所述方法包括:
所述第一信号发生器产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;
所述第一天线接收具有第一射频频段的第一上行射频信号,并向所述第一无源混频器发送所述具有第一射频频段的第一上行射频信号;
所述第一无源混频器接收所述第一本振信号,利用接收到的所述第一本振信号,对所述具有第一射频频段的第一上行射频信号进行混频处理,形成具有第二射频频段的上行射频信号后通过所述无源DAS线路向所述第一混频器发送;
所述第一混频器接收所述具有第二射频频段的上行射频信号;
所述第一混频器利用所述第一信号发生器产生的第一本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送;或者,
利用所述第一混频器产生的本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送。
在第四方面的第一种可实现方式中,结合第四方面,所述远端接收设备还包括:第二天线、第一合路器;所述近端信号接收设备还包括:第二分路器;
所述第一无源混频器向所述第一混频器发送所述具有第二射频频段的上行射频信号具体包括:
所述第一无源混频器向所述第一合路器发送所述具有第二射频频段的上行射频信号;
所述方法还包括:
所述第二天线接收具有第一射频频段的第二上行射频信号,并向所述第一合路器发送所述具有第一射频频段的第二上行射频信号;
所述第一合路器将接收所述第二天线发送的所述具有第一射频频段的第二上行射频信号、以及所述第一无源混频器发送的所述具有第二射频频段的上行射频信号,将所述具有第一射频频段的第二上行射频信号和所述具有第二射频频段的上行射频信号进行合路处理,形成上行射频合路信号后通过所述无源DAS线路向所述第二分路器发送;所述第一射频频段与所述第二射频频段互不重叠;
所述第二分路器接收所述上行射频合路信号,将接收到的所述上行射频合路信号中的信号分离,获取所述具有第一射频频段的第二上行射频信号后向所述信宿发送,获取所述具有第二射频频段的上行射频信号后向所述第一混频器发送;
所述第一混频器接收所述具有第二射频频段的上行射频信号具体包括:
所述第一混频器接收所述第二分路器发送的所述具有第二射频频段的上行射频信号。
在第四方面的第第二种可实现方式中,结合第四方面的第一种可实现方式或第四方面的第二种可实现方式,
所述近端信号接收设备还包括:第二信号发生器、第二合路器、第二混频器;所述远端接收设备还包括:第三天线、第二无源混频器、第一分路器;
所述第一信号发生器发送所述第一本振信号具体包括:
所述第一信号发生器向所述第二合路器发送所述第一本振信号;
所述方法还包括:
所述第二信号发生器产生第二本振信号,并向所述第二合路器发送所述第二本振信号;
所述第二合路器接收所述第一信号发生器发送的所述第一本振信号、以及所述第二信号发生器发送的所述第二本振信号,并对所述第一本振信号和所述第二本振信号进行合路处理,形成第一合路信号后经所述无源DAS线路向所述第一分路器发送;
所述第一分路器接收所述第一合路信号,将所述第一合路信号中的信号分离出来,获取所述第一本振信号后向所述第一无源混频器发送,获取所述第二本振信号后向所述第二无源混频器发送;
所述第三天线接收具有第一射频频段的第三上行射频信号,并向所述第二无源混频器发送所述具有第一射频频段的第三上行射频信号;
所述第二无源混频器接收所述第一分路器发送的所述第二本振信号、以及所述第三天线发送的所述具有第一射频频段的第三上行射频信号,利用所述第二本振信号对所述具有第一射频频段的第三上行射频信号进行混频处理,形成具有第三射频频段的上行射频信号后向所述第一合路器发送;其中,所述第三射频频段与所述第二射频频段互不重叠;
所述第一合路器接收所述第二无源混频器发送的所述具有第三射频频段的上行射频信号,将所述具有第三射频频段的上行射频信号合路在所述上行射频合路信号内经所述无源DAS线路向所述第二分路器发送;
所述第二分路器获取所述具有第三射频频段的上行射频信号后向所述第二混频器发送;
所述第二混频器接收所述第二分路器发送的所述具有第三射频频段的上行射频信号;
所述第二混频器利用所述第二信号发生器产生的所述第二本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送;或者,
利用所述第二混频器产生的本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送。
由上可知,本发明实施例提供一种分布式天线系统及信号传输方法,所述分布式天线系统包括:近端信号产生设备、无源DAS线路以及远端发射设备;所述近端信号产生设备包括:第一信号发生器,所述远端发射设备包含:第一无源混频器以及第一天线;利用远端的无源混频器对接收到的变频信号进行处理。与现有DAS相比,在远端发射设备处设置一无源混频器,利用其它设备传送至该无源混频器的本振信号进行混频处理,即不需要混频器自身在供电的情况下产生本振信号,从而避免了现有实现向DAS远端的有源混频器 供电,导致的施工难度大、成本高的问题。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为现有分布式天线系统DAS的结构图;
图2为本发明实施例提供的一种DAS的结构图;
图3为本发明实施例提供的另一种DAS的结构图;
图4为本发明实施例提供的另一种DAS的结构图;
图5为本发明实施例提供的另一种DAS的结构图;
图6为本发明实施例提供的另一种DAS的结构图;
图7为本发明实施例提供的另一种DAS的结构图;
图8为本发明实施例提供的另一种信号传输方法的流程图;
图9为本发明实施例提供的另一种信号传输方法的流程图;
图10为本发明实施例提供的另一种DAS的结构图;
图11为本发明实施例提供的另一种DAS的结构图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明的基本思想是:在远端天线处设置一无源混频器,利用其它设备传送至该无源混频器的本振信号进行混频处理,即不需要混频器自身在供电的情况下产生本振信号,避免了远端的混频器在产生本振信号时需要近端供电导致的施工不便的问题。下面对本发明实施例提供的分布式天线系统及信号传输方法进行介绍。
实施例一
图2为本发明实施例提供的一种分布式天线系统(Distributed Antenna System,简称DAS)的结构图,如图2所示,该DAS可以包含包括:近端信号产生设备10、无源DAS线路20以及远端发射设备30;其中,近端信号产生设备10位于无源DAS线路20的入端口,远端发射设备30位于无源DAS线路20的出端口;需要说明的是,本发明实施例中所述的入端口和出端口是相对于下行射频信号的传输方向而定的,并不对设备的具体位置进行限制。
所述近端信号发生设备10用于产生信号,位于机房,可以包含:产生信号的任一设备、以及对产生的信号进行混频、合路等处理的设备,可以包括信源、第一信号发生器101;其中,信源可以指产生信号的任一设备,如宏基站、微基站、直放站、射频单元(pico remote radio unit,RRU)、微微基站、微微RRU等设备。
所述无源DAS线路20用于将近端产生的信号传输到室内天线,经室内天线发送给用户近端信号传输至室内,可以为包含耦合器和功分器等器件在内的线路。
所述远端发射设备30用于发射信号,位于室内天花板等位置,可以包含:第一无源混频器301以及第一天线302;其中,第一天线302的入端口与所述第一无源混频器301的出端口连接。
所述第一信号发生器101,用于产生第一本振信号,并向所述第一无源混频器301发送所述第一本振信号。
所述第一无源混频器301,用于接收所述第一本振信号、以及具有第二射频频段的下行射频信号。
其中,所述第二射频频段的下行射频信号为:所述第一本振信号与所述信源发出的具有第一射频频段的第一下行射频信号混频后产生的信号;且所述第一射频频段与所述第二射频频段互不重叠。
所述第一无源混频器301,还用于利用所述第一本振信号对接收到的所述具有第二射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第一下行射频信号后向所述第一天线302 发送。
其中,所述混频处理可以是上变频处理,也可以是下变频处理;所述上变频处理可以指:将第一本振信号的频段与第二射频频段进行相加,将下行射频信号的频段搬移到比第二射频频段更高的第一射频频段上;所述下变频处理可以指:将第一本振信号的频段与第二射频频段进行相减,将下行射频信号的频段搬移到比第二射频频段较低的第一射频频段上。
例如,若第一射频频段为F1=[1.850-1.860]GHz,第二射频频段F2=[0.850-0.860]GHz,则第一无源混频器301可以利用第一本振信号F=1GHz将具有第二射频频段F2=[0.850-0.860]GHz的信号上变频到频段F1=[1.850-1.860]GHz上。
若第一射频频段为F1=[1.850-1.860]GHz,第二射频频段F2=[2.050-2.060]GHz,则第一无源混频器301可以利用第一本振信号F=0.200GHz将具有第二射频频段F2=[2.050-2.060]GHz下变频到频段F1=[1.850-1.860]GHz上。
所述第一天线302,用于将接收到的所述具有第一射频频段的第一下行射频信号发射出去。
可选的,本发明实施例中,可以将近端混频处理后的下行射频信号和本振信号合路在一起经无源DAS线路传输给第一无源混频器301;具体的,如图3所示,所述近端信号产生设备10可以包括:合路器102以及第一混频器103;所述远端发射设备30还包括:分路器303;
所述第一信号发生器101,具体用于向所述合路器102发送所述第一本振信号,经所述合路器102合路处理后经所述无源DAS线路20向所述第一无源混频器301发送;
所述第一混频器103,用于接收所述信源发出的所述具有第一射频频段的第一下行射频信号;
其中,所述第一混频器103可以为无源混频器,还可以为有源混频器;当所述第一混频器103为无源混频器时,所述第一混频器 103,还可以用于利用所述第一信号发生器产生的所述第一本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;
当所述第一混频器103为有源混频器,所述第一混频器103还可以利用所述第一混频器产生的本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送。
需要说明的是,当所述第一混频器103为有源混频器时,由于第一混频器103自身可以产生本振信号,所以,在本发明实施例中,还可以由近端信号产生设备中的第一混频器103产生本振信号,并向所述第一无源混频器301发送所述本振信号,即所述第一无源混频器301,还可以用于接收所述第一混频器103产生的本振信号,对于第一无源混频器301,该本振信号的作用和第一本振信号相同。
可选的,所述具有第二射频频段的下行射频信号可以为比较适合无源DAS线路传输的信号,即变频后的具有第二射频频段的下行射频信号经所述无源DAS线路传输时的衰减要小于所述第一下行射频信号经所述无源DAS线路传输时的衰减,以使得信号传输时的衰落减少,提高信号的传输距离。如,S2是高频信号,S3是变频后的比较适合无源DAS线路传输的信号。
所述合路器102,用于接收所述具有第二射频频段的下行射频信号和所述第一本振信号,将接收到的所述具有第二射频频段的下行射频信号和所述第一本振信号进行合路,形成下行射频合路信号后通过所述无源DAS线路向所述分路器发送。
所述分路器303,用于接收所述下行射频合路信号,将接收到的所述下行射频合路信号中包含的信号分离,获取具有所述第二射频频段的下行射频信号和所述第一本振信号后向所述第一无源混频器发送。
所述第一无源混频器301接收所述第一本振信号、以及具有第二射频频段的下行射频信号,具体为接收所述分路器发送的所述第 一本振信号、以及所述具有第二射频频段的下行射频信号。
进一步的,本发明实施例提供的DAS,还可以支持同频双流传输,以实现对DAS系统的扩容,如:可以将一路下行射频信号和经变频后的一下行射频信号合在一起进行传输,具体的,如图3所示,所述远端发射设备30还包括:第二天线304;
所述合路器102,还用于接收所述信源发出的具有第一射频频段的第二下行射频信号,将所述第二下行射频信号合路在所述下行射频合路信号内向所述分路器发送。
其中,所述第二下行射频合路信号可以为:将所述第一下行射频信号与所述下行射频合路信号中原有的信号合路在一起形成的信号。
所述分路器303,还用于获取所述具有第一射频频段的第二下行射频信号后向所述第二天线发送。
所述第二天线304,用于将接收到所述具有第一射频频段的第二下行射频信号发射出去。
如此,将两路同频信号经DAS系统发射出去,与现有仅支持单流传输的DAS系统相比,提供了系统容量。
进一步的,为了更好的提高DAS系统的传输容量,本发明实施例提供的DAS还可以支持多流同频信号的传输,如:将至少两路同频下行射频信号分别经混频处理后,形成具有不同频段的信号后合路在一起发送至远端,远端根据合路信号获得多个射频信号后,经多个天线发射出去;具体的,如图4所示,所述近端信号产生设备10还可以包括:第二信号发生器104、第二混频器105;所述远端发射设备30还可以包括:第二无源混频器305和第三天线306;
所述第二信号发生器104,用于产生第二本振信号,并向所述合路器102发送所述第二本振信号;
所述第二混频器105,用于接收所述信源发出的具有第一射频频段的第三下行射频信号。
所述第二混频器105,还用于接收所述第二信号发生器发送的 所述第二本振信号,利用所述第二本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;或者,
利用所述第二混频器产生的本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;其中,所述第三射频频段与所述第一射频频段互不重叠。
所述合路器102,还用于接收所述第二混频器发送的所述具有第三射频频段的下行射频信号和所述第二信号发生器发送的第二本振信号,将接收到的所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号内向所述分路器发送。
其中,需要说明的是,上述将接收到的所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号中可以指:将接收到的所述具有第三射频频段的下行射频信号、所述第二本振信号与所述下行射频合路信号中原有的信号合路在一起重新形成下行射频合路信号。
所述分路器303,还用于获取所述具有第三射频频段的下行射频信号和所述第二本振信号后向所述第二无源混频器中发送。
所述第二无源混频器305,用于利用所述第二本振信号对所述具有第三射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第三下行射频信号后向所述第三天线中发送。
所述第三天线306,用于将接收到的所述具有第一射频频段的第三下行射频信号发射出去。
可以理解的是,本发明上述实施例中的描述是以DAS支持同频双流的处理作为示例,并不排除大于两个(即多流)同频上行射频信号的情况。其中,大于两个上行射频信号的处理也应包含在本实施例所描述的技术方案内,如此,DAS可以同时发射多个同频信号,大大提供了DAS的系统容量。
在通信过程中,作为发送下行信号的逆过程,分布式天线系统 还可以用于接收上行信号,对上行信号进行处理。可以理解的是,对上行信号的处理可以是对下行信号处理的逆过程,也可以有一定的不同。存在不同时,对上行信号处理的模块和对下行信号处理的模块可以有一定的不同。具体的,如图5所示,所述DAS还可以包括:近端信号接收设备40、无源DAS线路20以及远端接收设备50,
其中,近端信号接收器40位于无源DAS线路20的出端口,远端接收设备50位于无源DAS线路20的入端口;需要说明的是,上述入端口和出端口是相对于上行射频信号的传输方向而定的,并不对设备的具体位置进行限制。
所述近端发信号接收设备40用于接收信号,位于机房,可以包含:接收信号的任一设备、以及对接收的信号进行混频、合路等处理的设备,可以包括信宿、第一信号发生器401、第一混频器402;其中,信宿是指可以接收信号的任一设备,如宏基站、微基站、直放站、射频单元(pico remote radio unit,RRU)、微微基站、微微RRU等设备。
所述无源DAS线路20用于将近端产生的信号传输到室内天线,经室内天线发送给用户近端信号传输至室内,可以为包含耦合器和功分器等器件在内的线路。
所述远端接收设备50用于接收信号,位于室内天花板等位置,可以包含:第一无源混频器501以及第一天线502;其中,第一天线502的出端口与所述第一无源混频器501的入端口连接。
所述第一信号发生器401,用于产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;
所述第一天线502,用于接收具有第一射频频段的第一上行射频信号,并向所述第一无源混频器发送所述具有第一射频频段的第一上行射频信号。
所述第一无源混频器501,用于接收所述第一本振信号,利用接收到的所述第一本振信号,对所述具有第一射频频段的第一上行射频信号进行混频处理,形成具有第二射频频段的上行射频信号后 通过所述无源DAS线路向所述第一混频器发送。
所述第一混频器402,用于接收所述具有第二射频频段的上行射频信号;
所述第一混频器402,还用于利用所述第一信号发生器产生的第一本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送;或者,
利用所述第一混频器产生的本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送。
进一步的,本发明实施例提供的DAS,还可以支持同频双流传输,以实现对DAS系统的扩容,如:可以将一路上行射频信号和经变频后的一上行射频信号合在一起进行传输,具体的,如图6所示,所述远端接收设备50还包括:第二天线503、第一合路器505;所述近端信号接收设备40还包括:第二分路器405;
所述第二天线503,用于接收具有第一射频频段的第二上行射频信号,并向所述第一合路器505发送所述具有第一射频频段的第二上行射频信号;
所述第一无源混频器501,具体用于向所述第一合路器505发送所述具有第二射频频段的上行射频信号;
所述第一合路器505,用于将接收所述第二天线发送的所述具有第一射频频段的第二上行射频信号、以及所述第一无源混频器501发送的所述具有第二射频频段的上行射频信号,将所述具有第一射频频段的第二上行射频信号和所述具有第二射频频段的上行射频信号进行合路处理,形成上行射频合路信号后通过所述无源DAS线路向所述第二分路器发送;所述第一射频频段与所述第二射频频段互不重叠;
所述第二分路器405,用于接收所述上行射频合路信号,将接收到的所述上行射频合路信号中的信号分离,获取所述具有第一射 频频段的第二上行射频信号后向所述信宿发送,获取所述具有第二射频频段的上行射频信号后向所述第一混频器402发送;
所述第一混频器402,具体用于接收所述第二分路器发送的所述具有第二射频频段的上行射频信号。
进一步的,为了更好的提高DAS系统的传输容量,本发明实施例提供的DAS还可以支持多流同频信号的传输,如:将至少两路同频上行射频信号分别经混频处理后,形成具有不同频段的信号后合路在一起发送至近端信宿;具体的,如图7所示,所述近端信号接收设备还包括:第二信号发生器404、第二合路器406、第二混频器403;所述远端接收设备还包括:第三天线507、第二无源混频器503、第一分路器506506;
所述第二信号发生器404,用于产生第二本振信号,并向所述第二合路器406发送所述第二本振信号;
所述第一信号发生器401,具体用于向所述第二合路器406发送所述第一本振信号;
所述第二合路器406,用于接收所述第一信号发生器401发送的所述第一本振信号、以及所述第二信号发生器404发送的所述第二本振信号,并对所述第一本振信号和所述第二本振信号进行合路处理,形成第一合路信号后经所述无源DAS线路向所述第一分路器506506发送;
所述第一分路器506506,用于接收所述第一合路信号,将所述第一合路信号中的信号分离出来,获取所述第一本振信号后向所述第一无源混频器501发送,获取所述第二本振信号后向所述第二无源混频器503发送;
所述第一无源混频器501,具体用于接收所述第一分路器506506发送的所述第一本振信号;
所述第三天线507,用于接收具有第一射频频段的第三上行射频信号,并向所述第二无源混频器503发送所述具有第一射频频段的第三上行射频信号;
所述第二无源混频器503,用于接收所述第一分路器506506发送的所述第二本振信号、以及所述第三天线507发送的所述具有第一射频频段的第三上行射频信号,利用所述第二本振信号对所述具有第一射频频段的第三上行射频信号进行混频处理,形成具有第三射频频段的上行射频信号后向所述第一合路器505发送;其中,所述第三射频频段与所述第二射频频段互不重叠;
所述第一合路器505,还用于接收所述第二无源混频器503发送的所述具有第三射频频段的上行射频信号,将所述具有第三射频频段的上行射频信号合路在所述上行射频合路信号内经所述无源DAS线路向所述第二分路器发送;
所述第二分路器405,还用于获取所述具有第三射频频段的上行射频信号后向所述第二混频器403发送;
所述第二混频器403,用于接收所述第二分路器发送的所述具有第三射频频段的上行射频信号;
所述第二混频器403,还用于利用所述第二信号发生器404产生的所述第二本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送;或者,
利用所述第二混频器403产生的本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送。
可以理解的是,本发明上述实施例中的描述是以DAS支持同频双流的处理作为示例,并不排除大于两个(即多流)同频上行射频信号的情况。其中,大于两个上行射频信号的处理也应包含在本实施例所描述的技术方案内,如此,DAS可以同时发射多个同频信号,大大提供了DAS的系统容量。
需要说明的是,本发明实施例提供的分布式天线系统DAS,可以应用于无线通信网络中,该无线通信网络可以包括该DAS,还可以包括被该无源DAS服务的用户设备。此外,本申请实施例中的 “一”、“二”、“三”、“四”等数字,仅为了便于清楚的描述或是区分,并不代表方案的优劣。
由上可知,本发明实施例提供一种分布式天线系统,包括:近端信号产生设备、无源DAS线路以及远端发射设备,其特征在于,所述近端信号产生设备包括:信源、第一信号发生器;所述远端发射设备包括:第一无源混频器以及第一天线;所述第一信号发生器,用于产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;所述第一无源混频器,用于接收所述第一本振信号、以及具有第二射频频段的下行射频信号;所述第一无源混频器,还用于利用所述第一本振信号对接收到的所述具有第二射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第一下行射频信号后向所述第一天线发送;所述第一天线,用于将接收到的所述具有第一射频频段的第一下行射频信号发射出去。与现有DAS相比,在远端发射设备处设置一无源混频器,利用其它设备传送至该无源混频器的本振信号进行混频处理,即不需要混频器自身在供电的情况下产生本振信号,从而避免了现有实现向DAS远端的有源混频器供电,导致的施工难度大、成本高的问题。
实施例二
图8为本发明实施例提供的一种信号传输方法,由实施例一所述的DAS执行,近端信号产生设备、无源DAS线路以及远端发射设备,其特征在于,所述近端信号产生设备包括:信源、第一信号发生器;所述远端发射设备包括:第一无源混频器以及第一天线;如图8所示,所述方法可以包括:
步骤101:第一信号发生器产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号。
步骤102:第一无源混频器接收所述第一本振信号、以及具有第二射频频段的下行射频信号。
其中,所述第二射频频段的下行射频信号为:所述第一本振信号与所述信源发出的具有第一射频频段的第一下行射频信号混频后 产生的信号;且所述第一射频频段与所述第二射频频段互不重叠;
可选的,所述具有第二射频频段的下行射频信号可以为比较适合无源DAS线路传输的信号,即具有第二射频频段的下行射频信号经所述无源DAS线路传输时的衰减要小于所述第一下行射频信号经所述无源DAS线路传输时的衰减,以使得信号传输时的衰落减少,提高信号的传输距离。
步骤103:第一无源混频器利用所述第一本振信号对接收到的所述具有第二射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第一下行射频信号后向所述第一天线发送。
其中,所述混频处理可以是上变频处理,也可以是下变频处理;所述上变频处理可以指:将第一本振信号的频段与第二射频频段进行相加,将下行射频信号的频段搬移到比第二射频频段更高的第一射频频段上;所述下变频处理可以指:将第一本振信号的频段与第二射频频段进行相减,将下行射频信号的频段搬移到比第二射频频段较低的第一射频频段上。
例如,若第一射频频段为F1=[1.850-1.860]GHz,第二射频频段F2=[0.850-0.860]GHz,则第一无源混频器301可以利用第一本振信号F=1GHz将具有第二射频频段F2=[0.850-0.860]GHz的信号上变频到频段F1=[1.850-1.860]GHz上。
若第一射频频段为F1=[1.850-1.860]GHz,第二射频频段F2=[2.050-2.060]GHz,则第一无源混频器301可以利用第一本振信号F=0.200GHz将具有第二射频频段F2=[2.050-2.060]GHz下变频到频段F1=[1.850-1.860]GHz上。
步骤104:第一天线将接收到的所述具有第一射频频段的第一下行射频信号发射出去。
可选的,本发明实施例中,可以将近端混频处理后的下行射频信号和本振信号合路在一起经无源DAS线路传输,给第一无源混频器,具体的,所述近端信号产生设备可以包括:第一混频器以及合路器;所述远端发射设备还包括:分路器;
所述第一信号发生器向所述第一无源混频器发送所述第一本振信号具体包括:
所述第一信号发生器向所述合路器发送所述第一本振信号,由所述合路器向所述第一无源混频器发送所述第一本振信号;
在所述第一无源混频器接收具有第二射频频段的下行射频信号之前,所述方法还包括:
所述第一混频器接收所述信源发出的所述具有第一射频频段的第一下行射频信号;
所述第一混频器利用所述第一信号发生器产生的所述第一本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;或者,
利用所述第一混频器产生的本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;
所述合路器接收所述具有第二射频频段的下行射频信号和所述第一本振信号,将接收到的所述具有第二射频频段的下行射频信号和所述第一本振信号进行合路,形成下行射频合路信号后通过所述无源DAS线路向所述分路器发送;
所述分路器接收所述下行射频合路信号,将接收到的所述下行射频合路信号中包含的信号分离,获取具有所述第二射频频段的下行射频信号和所述第一本振信号后向所述第一无源混频器发送;
所述第一无源混频器接收所述第一本振信号、以及具有第二射频频段的下行射频信号具体包括:
所述第一无源混频器接收所述分路器发送的所述第一本振信号、以及所述具有第二射频频段的下行射频信号。
进一步的,本发明实施例提供的DAS,还可以支持同频双流传输,如可以将一路下行射频信号和经变频后的一下行射频信号合在一起进行传输,具体的,所述远端发射设备还可以包括:第二天线;所述方法还可以包括:
所述合路器接收所述信源发出的具有第一射频频段的第二下行射频信号,将所述第二下行射频信号合路在所述下行射频合路信号内向所述分路器发送;
所述分路器获取所述具有第一射频频段的第二下行射频信号后向所述第二天线发送;
所述第二天线将接收到所述具有第一射频频段的第二下行射频信号发射出去。
其中,所述将所述第一下行射频信号合路在所述下行射频合路信号内,形成第二下行射频合路信号可以包括:将所述第一下行射频信号与所述下行射频合路信号中原有的信号合路在一起重新形成第二下行射频合路信号。
如此,将两路同频信号经DAS系统发射出去,与现有仅支持单流传输的DAS系统相比,提供了系统容量。
进一步的,为了更好的提高DAS系统的传输容量,本发明实施例提供的DAS还可以支持多流同频信号的传输,如:将至少两路同频下行射频信号分别经混频处理后,形成具有不同频段的信号后合路在一起发送至远端,远端根据合路信号获得多个射频信号后,经多个天线发射出去;具体的,所述近端信号产生设备还可以包括:第二信号发生器、第二混频器;所述远端发射设备还包括:第二无源混频器和第三天线;所述方法还可以包括:
所述第二信号发生器产生第二本振信号,并向所述合路器发送所述第二本振信号;
所述第二混频器接收所述信源发出的具有第一射频频段的第三下行射频信号;
所述第二混频器接收所述第二信号发生器发送的所述第二本振信号,利用所述第二本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;或者,
利用所述第二混频器产生的本振信号对所述具有第一射频频段 的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;其中,所述第三射频频段与所述第一射频频段互不重叠;
所述合路器接收所述第二混频器发送的所述具有第三射频频段的下行射频信号和所述第二信号发生器发送的第二本振信号,将接收到的所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号内向所述分路器发送;
所述分路器获取所述具有第三射频频段的下行射频信号和所述第二本振信号后向所述第二无源混频器中发送;
所述第二无源混频器利用所述第二本振信号对所述具有第三射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第三下行射频信号后向所述第三天线中发送;
所述第三天线将接收到的所述具有第一射频频段的第三下行射频信号发射出去。所述至少一个第三天线中的一个将接收到的所述具有第一射频频段的下行射频信号发射出去。
其中,所述将接收到的所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号内,形成第三下行射频合路信号可以包括:将接收到的所述具有第三射频频段的下行射频信号、所述第二本振信号与所述下行射频合路信号中原有的信号合路在一起重新形成下行射频合路信号。
可以理解的是,本发明上述实施例中的描述是以DAS支持同频双流的处理作为示例,并不排除大于两个(即多流)同频上行射频信号的情况。其中,大于两个上行射频信号的处理也应包含在本实施例所描述的技术方案内,如此,DAS可以同时发射多个同频信号,大大提供了DAS的系统容量。
在通信过程中,作为发送下行信号的逆过程,分布式天线系统还可以用于接收上行信号,对上行信号进行处理。可以理解的是,对上行信号的处理可以是对下行信号处理的逆过程,也可以有一定的不同。例如,图9示出了本发明实施例提供的另一种信号传输方 法,由分布式天线系统DAS执行,所述DAS包括:近端信号接收设备、无源DAS线路以及远端接收设备,所述近端信号接收设备包括:信宿、第一信号发生器、第一混频器;所述远端接收设备包括:第一无源混频器以及第一天线;如图9所示,所述方法可以包括:
步骤201:第一信号发生器产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号。
步骤202:第一天线接收具有第一射频频段的第一上行射频信号,并向所述第一无源混频器发送所述具有第一射频频段的第一上行射频信号。
步骤203:第一无源混频器接收所述第一本振信号,利用接收到的所述第一本振信号,对所述具有第一射频频段的第一上行射频信号进行混频处理,形成具有第二射频频段的上行射频信号后通过所述无源DAS线路向所述第一混频器发送。
步骤204:第一混频器接收所述具有第二射频频段的上行射频信号;利用所述第一信号发生器产生的第一本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送;或者,
利用所述第一混频器产生的本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送。
进一步的,本发明实施例提供的DAS,还可以支持同频双流传输,以实现对DAS系统的扩容,如:可以将一路上行射频信号和经变频后的一上行射频信号合在一起进行传输,具体的,所述远端接收设备还可以包括:第二天线、第一合路器;所述近端信号接收设备还可以包括:第二分路器;
所述第一无源混频器向所述第一混频器发送所述具有第二射频频段的上行射频信号具体包括:
所述第一无源混频器向所述第一合路器发送所述具有第二射频频段的上行射频信号;
所述方法还包括:
所述第二天线接收具有第一射频频段的第二上行射频信号,并向所述第一合路器发送所述具有第一射频频段的第二上行射频信号;
所述第一合路器将接收所述第二天线发送的所述具有第一射频频段的第二上行射频信号、以及所述第一无源混频器发送的所述具有第二射频频段的上行射频信号,将所述具有第一射频频段的第二上行射频信号和所述具有第二射频频段的上行射频信号进行合路处理,形成上行射频合路信号后通过所述无源DAS线路向所述第二分路器发送;所述第一射频频段与所述第二射频频段互不重叠;
所述第二分路器接收所述上行射频合路信号,将接收到的所述上行射频合路信号中的信号分离,获取所述具有第一射频频段的第二上行射频信号后向所述信宿发送,获取所述具有第二射频频段的上行射频信号后向所述第一混频器发送;
所述第一混频器接收所述具有第二射频频段的上行射频信号具体包括:
所述第一混频器接收所述第二分路器发送的所述具有第二射频频段的上行射频信号。
进一步的,为了更好的提高DAS系统的传输容量,本发明实施例提供的DAS还可以支持多流同频信号的传输,如:将至少两路同频上行射频信号分别经混频处理后,形成具有不同频段的信号后合路在一起发送至近端信宿;具体的,所述近端信号接收设备还可以包括:第二信号发生器、第二合路器、第二混频器;所述远端接收设备还可以包括:第三天线、第二无源混频器、第一分路器;
所述第一信号发生器发送所述第一本振信号具体包括:
所述第一信号发生器向所述第二合路器发送所述第一本振信号;
所述方法还包括:
所述第二信号发生器产生第二本振信号,并向所述第二合路器 发送所述第二本振信号;
所述第二合路器接收所述第一信号发生器发送的所述第一本振信号、以及所述第二信号发生器发送的所述第二本振信号,并对所述第一本振信号和所述第二本振信号进行合路处理,形成第一合路信号后经所述无源DAS线路向所述第一分路器发送;
所述第一分路器接收所述第一合路信号,将所述第一合路信号中的信号分离出来,获取所述第一本振信号后向所述第一无源混频器发送,获取所述第二本振信号后向所述第二无源混频器发送;
所述第三天线接收具有第一射频频段的第三上行射频信号,并向所述第二无源混频器发送所述具有第一射频频段的第三上行射频信号;
所述第二无源混频器接收所述第一分路器发送的所述第二本振信号、以及所述第三天线发送的所述具有第一射频频段的第三上行射频信号,利用所述第二本振信号对所述具有第一射频频段的第三上行射频信号进行混频处理,形成具有第三射频频段的上行射频信号后向所述第一合路器发送;其中,所述第三射频频段与所述第二射频频段互不重叠;
所述第一合路器接收所述第二无源混频器发送的所述具有第三射频频段的上行射频信号,将所述具有第三射频频段的上行射频信号合路在所述上行射频合路信号内经所述无源DAS线路向所述第二分路器发送;
所述第二分路器获取所述具有第三射频频段的上行射频信号后向所述第二混频器发送;
所述第二混频器接收所述第二分路器发送的所述具有第三射频频段的上行射频信号;
所述第二混频器利用所述第二信号发生器产生的所述第二本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送;或者,
利用所述第二混频器产生的本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送。
可以理解的是,本发明上述实施例中的描述是以DAS支持同频双流的处理作为示例,并不排除大于两个(即多流)同频上行射频信号的情况。其中,大于两个上行射频信号的处理也应包含在本实施例所描述的技术方案内,如此,DAS可以同时发射多个同频信号,大大提供了DAS的系统容量。
需要说明的是,本发明实施例提供的分布式天线系统DAS,可以应用于无线通信网络中,该无线通信网络可以包括该DAS,还可以包括被该无源DAS服务的用户设备。此外,本申请实施例中的“一”、“二”、“三”、“四”等数字,仅为了便于清楚的描述或是区分,并不代表方案的优劣。
由上可知,本发明实施例提供一种信号传输方法,由分布式天线系统DAS执行,所述DAS包括:近端信号产生设备、无源DAS线路以及远端发射设备,其特征在于,所述近端信号产生设备包括:信源、第一信号发生器;所述远端发射设备包括:第一无源混频器以及第一天线;所述第一信号发生器产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;所述第一无源混频器接收所述第一本振信号、以及具有第二射频频段的下行射频信号;所述第一无源混频器利用所述第一本振信号对接收到的所述具有第二射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第一下行射频信号后向所述第一天线发送;所述第一天线将接收到的所述具有第一射频频段的第一下行射频信号发射出去。与现有DAS相比,在远端发射设备处设置一无源混频器,利用其它设备传送至该无源混频器的本振信号进行混频处理,即不需要混频器自身在供电的情况下产生本振信号,从而避免了现有实现向DAS远端的有源混频器供电,导致的施工难度大、成本高的问题。
实施例三
图10示出了本发明实施例提供的一种分布式天线系统DAS的结构图,用于执行实施例二所述的方法,如图10所示,所述分布式天线系统DAS可以包括:处理器1001,通信单元1002,收发器1003,存储器1004、无源DAS线路1005;所述无源DAS线路1005用于实现这些设备之间的连接和相互通信;
处理器1001可能是一个中央处理器(英文:central processing unit,简称为CPU)。
存储器1004,可以是易失性存储器(英文:volatile memory),例如随机存取存储器(英文:random-access memory,缩写:RAM);或者非易失性存储器(英文:non-volatile memory),例如只读存储器(英文:read-only memory,缩写:ROM),快闪存储器(英文:flash memory),硬盘(英文:hard disk drive,缩写:HDD)或固态硬盘(英文:solid-state drive,缩写:SSD);或者上述种类的存储器的组合,并向处理器1001提供指令和数据。
所述通信单元1002,用于接收第一本振信号以及具有第二射频频段的下行射频信号。
其中,所述第二射频频段的下行射频信号为:所述第一本振信号与所述信源发出的具有第一射频频段的第一下行射频信号混频后产生的信号;且所述第一射频频段与所述第二射频频段互不重叠;
可选的,所述具有第二射频频段的下行射频信号可以为比较适合无源DAS线路传输的信号,即具有第二射频频段的下行射频信号经所述无源DAS线路传输时的衰减要小于所述第一下行射频信号经所述无源DAS线路传输时的衰减,以使得信号传输时的衰落减少,提高信号的传输距离。
所述处理器1001,用于利用所述通信单元1002接收到的所述第一本振信号对所述具有第二射频频段的下行射频信号进行混频处理,形成具有第一射频频段的第一下行射频信号;其中,所述第二射频频段的下行射频信号为:所述第一本振信号与所述具有第一射 频频段的第一下行射频信号混频后产生的信号;所述第一射频频段与所述第二射频频段互不重叠。
其中,所述混频处理可以是上变频处理,也可以是下变频处理;所述上变频处理可以指:将第一本振信号的频段与第二射频频段进行相加,将下行射频信号的频段搬移到比第二射频频段更高的第一射频频段上;所述下变频处理可以指:将第一本振信号的频段与第二射频频段进行相减,将下行射频信号的频段搬移到比第二射频频段较低的第一射频频段上。
例如,若第一射频频段为F1=[1.850-1.860]GHz,第二射频频段F2=[0.850-0.860]GHz,则第一无源混频器301可以利用第一本振信号F=1GHz将具有第二射频频段F2=[0.850-0.860]GHz的信号上变频到频段F1=[1.850-1.860]GHz上。
若第一射频频段为F1=[1.850-1.860]GHz,第二射频频段F2=[2.050-2.060]GHz,则第一无源混频器301可以利用第一本振信号F=0.200GHz将具有第二射频频段F2=[2.050-2.060]GHz下变频到频段F1=[1.850-1.860]GHz上。
所述收发器1003,用于将所述具有第一射频频段的第一下行射频信号发射出去。
可选的,所述通信单元1002,还用于在所述通信单元1002接收具有第二射频频段的下行射频信号之前,接收具有第一射频频段的第一下行射频信号;
所述处理器1001,还用于对所述通信单元1002接收到的第一下行射频信号进行混频处理,形成所述具有第二射频频段的下行射频信号;
所述通信单元1002,还用于将接收将所述处理器1001形成的所述具有第二射频频段的下行射频信号和所述第一本振信号进行合路,形成下行射频合路信号;
所述处理器1001,还用于对所述通信单元1002形成的下行射频合路信号中的信号进行分离,获取所述具有第二射频频段的下行 射频信号和所述第一本振信号。
进一步的,本发明实施例提供的DAS,还可以支持同频双流传输,如可以将一路下行射频信号和经变频后的一下行射频信号合在一起进行传输,具体的,所述通信单元1002,还用于接收具有第一射频频段的第二下行射频信号,将所述具有第一射频频段的第二下行射频信号合路在所述下行射频合路信号内;
所述处理器1001,还用于根据所述下行射频合路信号获取所述具有第一射频频段的第二下行射频信号;
所述收发器1003,还用于将所述具有第一射频频段的第二下行射频信号发射出去。
其中,所述将所述第一下行射频信号合路在所述下行射频合路信号内,形成第二下行射频合路信号可以包括:将所述第一下行射频信号与所述下行射频合路信号中原有的信号合路在一起重新形成第二下行射频合路信号。
如此,将两路同频信号经DAS系统发射出去,与现有仅支持单流传输的DAS系统相比,提供了系统容量。
进一步的,为了更好的提高DAS系统的传输容量,本发明实施例提供的DAS还可以支持多流同频信号的传输,如:将至少两路同频下行射频信号分别经混频处理后,形成具有不同频段的信号后合路在一起发送至远端,远端根据合路信号获得多个射频信号后,经多个天线发射出去;具体的,所述通信单元1002,还用于接收第二本振信号以及具有第一射频频段的第三下行射频信号;
所述处理器1001,还用于对所述通信单元1002接收到的所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号;其中,所述第三射频频段与所述第一射频频段互不重叠;
所述通信单元1002,还用于将所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号内;
所述处理器1001,还用于根据所述下行射频合路信号获取所述 具有第三射频频段的下行射频信号和所述第二本振信号;用所述第二本振信号对所述具有第三射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第三下行射频信号;
所述收发器1003,还用于将所述具有第一射频频段的第三下行射频信号发射出去。
其中,所述将接收到的所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号内,形成第三下行射频合路信号可以包括:将接收到的所述具有第三射频频段的下行射频信号、所述第二本振信号与所述下行射频合路信号中原有的信号合路在一起重新形成下行射频合路信号。
可以理解的是,本发明上述实施例中的描述是以DAS支持同频双流的处理作为示例,并不排除大于两个(即多流)同频上行射频信号的情况。其中,大于两个上行射频信号的处理也应包含在本实施例所描述的技术方案内,如此,DAS可以同时发射多个同频信号,大大提供了DAS的系统容量。
在通信过程中,作为发送下行信号的逆过程,分布式天线系统还可以用于接收上行信号,对上行信号进行处理。可以理解的是,对上行信号的处理可以是对下行信号处理的逆过程,也可以有一定的不同。例如,图11示出了本发明实施例提供的一种分布式天线系统DAS的结构图,用于执行实施例二所述的方法,如图11所示,所述分布式天线系统DAS可以包括:处理器1101,通信单元1102,收发器1103,存储器1104、无源DAS线路1105;所述无源DAS线路1105用于实现这些设备之间的连接和相互通信;
处理器1101可能是一个中央处理器(英文:central processing unit,简称为CPU)。
存储器1104,可以是易失性存储器(英文:volatile memory),例如随机存取存储器(英文:random-access memory,缩写:RAM);或者非易失性存储器(英文:non-volatile memory),例如只读存储器(英文:read-only memory,缩写:ROM),快闪存储器(英文: flash memory),硬盘(英文:hard disk drive,缩写:HDD)或固态硬盘(英文:solid-state drive,缩写:SSD);或者上述种类的存储器的组合,并向处理器1101提供指令和数据。
所述通信单元1102,用于接收第一本振信号,并向所述收发器1103发送所述第一本振信号;
所述收发器1103,用于接收具有第一射频频段的第一上行射频信号,并利用所述第一本振信号对所述具有第一射频频段的第一上行射频信号进行混频处理,形成具有第二射频频段的上行射频信号;
所述处理器1101,用于对所述收发器1103形成的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号。
进一步的,本发明实施例提供的DAS,还可以支持同频双流传输,以实现对DAS系统的扩容,如:可以将一路上行射频信号和经变频后的一上行射频信号合在一起进行传输,具体的,所述收发器1103,还用于接收具有第一射频频段的第二上行射频信号,将所述具有第一射频频段的第二上行射频信号和所述具有第二射频频段的上行射频信号进行合路处理,形成一路上行射频合路信号;其中,所述第一射频频段与所述第二射频频段互不重叠;
所述处理器1101,还用于对所述收发器1103接收到的所述上行射频合路信号中的信号进行分离,获取所述具有第一射频频段的第二上行射频信号和。
进一步的,为了更好的提高DAS系统的传输容量,本发明实施例提供的DAS还可以支持多流同频信号的传输,如:将至少两路同频上行射频信号分别经混频处理后,形成具有不同频段的信号后合路在一起发送至近端信宿;具体的,所述通信单元1102,还用于接收第二本振信号,并向所述收发器1103发送所述第二本振信号;
所述收发器1103,还用于接收具有第一射频频段的第三上行射频信号,并利用所述第二本振信号对所述具有第一射频频段的第三上行射频信号进行混频处理,形成具有第三射频频段的上行射频信 号;其中,所述第三射频频段与所述第二射频频段互不重叠;
所述收发器1103,还用于将所述具有第三射频频段的上行射频信号合路在所述上行射频合路信号内;
所述处理器1101,还用于对所述上行射频合路信号中的信号进行分离,获取所述具有第三射频频段的上行射频信号;
所述处理器1101,还用于对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号。
可以理解的是,本发明上述实施例中的描述是以DAS支持同频双流的处理作为示例,并不排除大于两个(即多流)同频上行射频信号的情况。其中,大于两个上行射频信号的处理也应包含在本实施例所描述的技术方案内,如此,DAS可以同时发射多个同频信号,大大提供了DAS的系统容量。
需要说明的是,本发明实施例提供的分布式天线系统DAS,可以应用于无线通信网络中,该无线通信网络可以包括该DAS,还可以包括被该无源DAS服务的用户设备。此外,本申请实施例中的“一”、“二”、“三”、“四”等数字,仅为了便于清楚的描述或是区分,并不代表方案的优劣。
由上可知,本发明实施例提供一种DAS,包括:处理器,通信单元,收发器;所述通信单元,用于接收第一本振信号以及具有第二射频频段的下行射频信号;所述处理器,用于利用所述通信单元接收到的所述第一本振信号对所述具有第二射频频段的下行射频信号进行混频处理,形成具有第一射频频段的第一下行射频信号;其中,所述第二射频频段的下行射频信号为:所述第一本振信号与所述具有第一射频频段的第一下行射频信号混频后产生的信号;所述第一射频频段与所述第二射频频段互不重叠;所述收发器,用于将所述具有第一射频频段的第一下行射频信号发射出去。与现有DAS相比,在远端发射设备处设置一无源混频器,利用其它设备传送至该无源混频器的本振信号进行混频处理,即不需要混频器自身在供 电的情况下产生本振信号,从而避免了现有实现向DAS远端的有源混频器供电,导致的施工难度大、成本高的问题。
在本申请所提供的几个实施例中,应该理解到,所揭露的系统,设备和方法,可以通过其它的方式实现。例如,以上所描述的设备实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。
所述作为分离设备说明的单元可以是或者也可以不是物理上分开的,作为单元显示的设备可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外,在本发明各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理包括,也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现,也可以采用硬件加软件功能单元的形式实现。
上述以软件功能单元的形式实现的集成的单元,可以存储在一个计算机可读取存储介质中。上述软件功能单元存储在一个存储介质中,包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器,或者网络设备等)执行本发明各个实施例所述方法的部分步骤。而前述的存储介质包括:U盘、移动硬盘、只读存储器(Read-Only Memory,简称ROM)、随机存取存储器(Random Access Memory,简称RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件(例如处理器)来完 成,该程序可以存储于一计算机可读存储介质中,存储介质可以包括:只读存储器、随机存储器、磁盘或光盘等。
最后应说明的是:以上实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (14)

  1. 一种分布式天线系统DAS,包括:近端信号产生设备、无源DAS线路以及远端发射设备,其特征在于,所述近端信号产生设备包括:信源、第一信号发生器;所述远端发射设备包括:第一无源混频器以及第一天线;
    所述第一信号发生器,用于产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;
    所述第一无源混频器,用于接收所述第一本振信号、以及具有第二射频频段的下行射频信号;
    所述第一无源混频器,还用于利用所述第一本振信号对接收到的所述具有第二射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第一下行射频信号后向所述第一天线发送;
    所述第一天线,用于将接收到的所述具有第一射频频段的第一下行射频信号发射出去。
  2. 根据权利要求1所述的DAS,其特征在于,
    所述近端信号产生设备还包括:第一混频器以及合路器;所述远端发射设备还包括:所述分路器;
    所述第一混频器,用于接收所述信源发出的所述具有第一射频频段的第一下行射频信号;
    所述第一混频器,还用于利用所述第一信号发生器产生的所述第一本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;或者,
    利用所述第一混频器产生的本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;
    所述第一信号发生器,具体用于向所述合路器发送所述第一本振信号;
    所述合路器,用于接收所述具有第二射频频段的下行射频信号和所述第一本振信号,将接收到的所述具有第二射频频段的下行射频信 号和所述第一本振信号进行合路,形成下行射频合路信号后通过所述无源DAS线路向所述分路器发送;
    所述分路器,用于接收所述下行射频合路信号,将接收到的所述下行射频合路信号中包含的信号分离,获取具有所述第二射频频段的下行射频信号和所述第一本振信号后向所述第一无源混频器发送;
    所述第一无源混频器接收所述第一本振信号、以及具有第二射频频段的下行射频信号,具体为接收所述分路器发送的所述第一本振信号、以及所述具有第二射频频段的下行射频信号。
  3. 根据权利要求2所述的DAS,其特征在于,所述远端发射设备还包括:第二天线;
    所述合路器,还用于接收所述信源发出的具有第一射频频段的第二下行射频信号,将所述第二下行射频信号合路在所述下行射频合路信号内向所述分路器发送;
    所述分路器,还用于获取所述具有第一射频频段的第二下行射频信号后向所述第二天线发送;
    所述第二天线,用于将接收到所述具有第一射频频段的第二下行射频信号发射出去。
  4. 根据权利要求2或3所述的DAS,其特征在于,
    所述近端信号产生设备还包括:第二信号发生器、第二混频器;所述远端发射设备还包括:第二无源混频器和第三天线;
    所述第二信号发生器,用于产生第二本振信号,并向所述合路器发送所述第二本振信号;
    所述第二混频器,用于接收所述信源发出的具有第一射频频段的第三下行射频信号;
    所述第二混频器,还用于接收所述第二信号发生器发送的所述第二本振信号,利用所述第二本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;或者,
    利用所述第二混频器产生的本振信号对所述具有第一射频频段 的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;其中,所述第三射频频段与所述第一射频频段互不重叠;
    所述合路器,还用于接收所述第二混频器发送的所述具有第三射频频段的下行射频信号和所述第二信号发生器发送的第二本振信号,将接收到的所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号内向所述分路器发送;
    所述分路器,还用于获取所述具有第三射频频段的下行射频信号和所述第二本振信号后向所述第二无源混频器中发送;
    所述第二无源混频器,用于利用所述第二本振信号对所述具有第三射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第三下行射频信号后向所述第三天线中发送;
    所述第三天线,用于将接收到的所述具有第一射频频段的第三下行射频信号发射出去。
  5. 一种分布式天线系统DAS,包括:近端信号接收设备、无源DAS线路以及远端接收设备,其特征在于,所述近端信号接收设备包括:信宿、第一信号发生器、第一混频器;所述远端接收设备包括:第一无源混频器以及第一天线;
    所述第一信号发生器,用于产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;
    所述第一天线,用于接收具有第一射频频段的第一上行射频信号,并向所述第一无源混频器发送所述具有第一射频频段的第一上行射频信号;
    所述第一无源混频器,用于接收所述第一本振信号,利用接收到的所述第一本振信号,对所述具有第一射频频段的第一上行射频信号进行混频处理,形成具有第二射频频段的上行射频信号后通过所述无源DAS线路向所述第一混频器发送;
    所述第一混频器,用于接收所述具有第二射频频段的上行射频信号;
    所述第一混频器,还用于利用所述第一信号发生器产生的第一本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送;或者,
    利用所述第一混频器产生的本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送。
  6. 根据权利要求5所述的DAS,其特征在于,所述远端接收设备还包括:第二天线、第一合路器;所述近端信号接收设备还包括:第二分路器;
    所述第二天线,用于接收具有第一射频频段的第二上行射频信号,并向所述第一合路器发送所述具有第一射频频段的第二上行射频信号;
    所述第一无源混频器,具体用于向所述第一合路器发送所述具有第二射频频段的上行射频信号;
    所述第一合路器,用于将接收所述第二天线发送的所述具有第一射频频段的第二上行射频信号、以及所述第一无源混频器发送的所述具有第二射频频段的上行射频信号,将所述具有第一射频频段的第二上行射频信号和所述具有第二射频频段的上行射频信号进行合路处理,形成上行射频合路信号后通过所述无源DAS线路向所述第二分路器发送;所述第一射频频段与所述第二射频频段互不重叠;
    所述第二分路器,用于接收所述上行射频合路信号,将接收到的所述上行射频合路信号中的信号分离,获取所述具有第一射频频段的第二上行射频信号后向所述信宿发送,获取所述具有第二射频频段的上行射频信号后向所述第一混频器发送;
    所述第一混频器,具体用于接收所述第二分路器发送的所述具有第二射频频段的上行射频信号。
  7. 根据权利要求5或6所述的DAS,其特征在于,
    所述近端信号接收设备还包括:第二信号发生器、第二合路器、 第二混频器;所述远端接收设备还包括:第三天线、第二无源混频器、第一分路器;
    所述第二信号发生器,用于产生第二本振信号,并向所述第二合路器发送所述第二本振信号;
    所述第一信号发生器,具体用于向所述第二合路器发送所述第一本振信号;
    所述第二合路器,用于接收所述第一信号发生器发送的所述第一本振信号、以及所述第二信号发生器发送的所述第二本振信号,并对所述第一本振信号和所述第二本振信号进行合路处理,形成第一合路信号后经所述无源DAS线路向所述第一分路器发送;
    所述第一分路器,用于接收所述第一合路信号,将所述第一合路信号中的信号分离出来,获取所述第一本振信号后向所述第一无源混频器发送,获取所述第二本振信号后向所述第二无源混频器发送;
    所述第一无源混频器,具体用于接收所述第一分路器发送的所述第一本振信号;
    所述第三天线,用于接收具有第一射频频段的第三上行射频信号,并向所述第二无源混频器发送所述具有第一射频频段的第三上行射频信号;
    所述第二无源混频器,用于接收所述第一分路器发送的所述第二本振信号、以及所述第三天线发送的所述具有第一射频频段的第三上行射频信号,利用所述第二本振信号对所述具有第一射频频段的第三上行射频信号进行混频处理,形成具有第三射频频段的上行射频信号后向所述第一合路器发送;其中,所述第三射频频段与所述第二射频频段互不重叠;
    所述第一合路器,还用于接收所述第二无源混频器发送的所述具有第三射频频段的上行射频信号,将所述具有第三射频频段的上行射频信号合路在所述上行射频合路信号内经所述无源DAS线路向所述第二分路器发送;
    所述第二分路器,还用于获取所述具有第三射频频段的上行射频 信号后向所述第二混频器发送;
    所述第二混频器,用于接收所述第二分路器发送的所述具有第三射频频段的上行射频信号;
    所述第二混频器,还用于利用所述第二信号发生器产生的所述第二本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送;或者,
    利用所述第二混频器产生的本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送。
  8. 一种信号传输方法,由分布式天线系统DAS执行,所述DAS包括:近端信号产生设备、无源DAS线路以及远端发射设备,其特征在于,所述近端信号产生设备包括:信源、第一信号发生器;所述远端发射设备包括:第一无源混频器以及第一天线;其特征在于,所述方法包括:
    所述第一信号发生器产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;
    所述第一无源混频器接收所述第一本振信号、以及具有第二射频频段的下行射频信号;
    所述第一无源混频器利用所述第一本振信号对接收到的所述具有第二射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第一下行射频信号后向所述第一天线发送;
    所述第一天线将接收到的所述具有第一射频频段的第一下行射频信号发射出去。
  9. 根据权利要求8所述的信号传输方法,其特征在于,所述近端信号产生设备还包括:第一混频器以及合路器;所述远端发射设备还包括:分路器;
    所述第一信号发生器向所述第一无源混频器发送所述第一本振信号具体包括:
    所述第一信号发生器向所述合路器发送所述第一本振信号,由所述合路器向所述第一无源混频器发送所述第一本振信号;
    在所述第一无源混频器接收具有第二射频频段的下行射频信号之前,所述方法还包括:
    所述第一混频器接收所述信源发出的所述具有第一射频频段的第一下行射频信号;
    所述第一混频器利用所述第一信号发生器产生的所述第一本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;或者,
    利用所述第一混频器产生的本振信号对所述第一下行射频信号进行混频处理,将混频后产生的所述具有第二射频频段的下行射频信号向所述合路器发送;
    所述合路器接收所述具有第二射频频段的下行射频信号和所述第一本振信号,将接收到的所述具有第二射频频段的下行射频信号和所述第一本振信号进行合路,形成下行射频合路信号后通过所述无源DAS线路向所述分路器发送;
    所述分路器接收所述下行射频合路信号,将接收到的所述下行射频合路信号中包含的信号分离,获取具有所述第二射频频段的下行射频信号和所述第一本振信号后向所述第一无源混频器发送;
    所述第一无源混频器接收所述第一本振信号、以及具有第二射频频段的下行射频信号具体包括:
    所述第一无源混频器接收所述分路器发送的所述第一本振信号、以及所述具有第二射频频段的下行射频信号。
  10. 根据权利要求9所述的信号传输方法,其特征在于,所述远端发射设备还包括:第二天线;所述方法还包括:
    所述合路器接收所述信源发出的具有第一射频频段的第二下行射频信号,将所述第二下行射频信号合路在所述下行射频合路信号内向所述分路器发送;
    所述分路器获取所述具有第一射频频段的第二下行射频信号后 向所述第二天线发送;
    所述第二天线将接收到所述具有第一射频频段的第二下行射频信号发射出去。
  11. 根据权利要求9或10所述的信号传输方法,其特征在于,所述近端信号产生设备还包括:第二信号发生器、第二混频器;所述远端发射设备还包括:第二无源混频器和第三天线;所述方法还包括:
    所述第二信号发生器产生第二本振信号,并向所述合路器发送所述第二本振信号;
    所述第二混频器接收所述信源发出的具有第一射频频段的第三下行射频信号;
    所述第二混频器接收所述第二信号发生器发送的所述第二本振信号,利用所述第二本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;或者,
    利用所述第二混频器产生的本振信号对所述具有第一射频频段的第三下行射频信号进行混频处理,形成具有第三射频频段的下行射频信号后向所述合路器发送;其中,所述第三射频频段与所述第一射频频段互不重叠;
    所述合路器接收所述第二混频器发送的所述具有第三射频频段的下行射频信号和所述第二信号发生器发送的第二本振信号,将接收到的所述具有第三射频频段的下行射频信号和所述第二本振信号合路在所述下行射频合路信号内向所述分路器发送;
    所述分路器获取所述具有第三射频频段的下行射频信号和所述第二本振信号后向所述第二无源混频器中发送;
    所述第二无源混频器利用所述第二本振信号对所述具有第三射频频段的下行射频信号进行混频处理,形成所述具有第一射频频段的第三下行射频信号后向所述第三天线中发送;
    所述第三天线将接收到的所述具有第一射频频段的第三下行射频信号发射出去。
  12. 一种信号传输方法,由分布式天线系统DAS执行,所述DAS包括:近端信号接收设备、无源DAS线路以及远端接收设备,所述近端信号接收设备包括:信宿、第一信号发生器、第一混频器;所述远端接收设备包括:第一无源混频器以及第一天线;其特征在于,所述方法包括:
    所述第一信号发生器产生第一本振信号,并通过所述无源DAS线路向所述第一无源混频器发送所述第一本振信号;
    所述第一天线接收具有第一射频频段的第一上行射频信号,并向所述第一无源混频器发送所述具有第一射频频段的第一上行射频信号;
    所述第一无源混频器接收所述第一本振信号,利用接收到的所述第一本振信号,对所述具有第一射频频段的第一上行射频信号进行混频处理,形成具有第二射频频段的上行射频信号后通过所述无源DAS线路向所述第一混频器发送;
    所述第一混频器接收所述具有第二射频频段的上行射频信号;
    所述第一混频器利用所述第一信号发生器产生的第一本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送;或者,
    利用所述第一混频器产生的本振信号对接收到的所述具有第二射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第一上行射频信号后向所述信宿发送。
  13. 根据权利要求12所述的信号传输方法,其特征在于,所述远端接收设备还包括:第二天线、第一合路器;所述近端信号接收设备还包括:第二分路器;
    所述第一无源混频器向所述第一混频器发送所述具有第二射频频段的上行射频信号具体包括:
    所述第一无源混频器向所述第一合路器发送所述具有第二射频频段的上行射频信号;
    所述方法还包括:
    所述第二天线接收具有第一射频频段的第二上行射频信号,并向所述第一合路器发送所述具有第一射频频段的第二上行射频信号;
    所述第一合路器将接收所述第二天线发送的所述具有第一射频频段的第二上行射频信号、以及所述第一无源混频器发送的所述具有第二射频频段的上行射频信号,将所述具有第一射频频段的第二上行射频信号和所述具有第二射频频段的上行射频信号进行合路处理,形成上行射频合路信号后通过所述无源DAS线路向所述第二分路器发送;所述第一射频频段与所述第二射频频段互不重叠;
    所述第二分路器接收所述上行射频合路信号,将接收到的所述上行射频合路信号中的信号分离,获取所述具有第一射频频段的第二上行射频信号后向所述信宿发送,获取所述具有第二射频频段的上行射频信号后向所述第一混频器发送;
    所述第一混频器接收所述具有第二射频频段的上行射频信号具体包括:
    所述第一混频器接收所述第二分路器发送的所述具有第二射频频段的上行射频信号。
  14. 根据权利要求13所述的信号传输方法,其特征在于,所述近端信号接收设备还包括:第二信号发生器、第二合路器、第二混频器;所述远端接收设备还包括:第三天线、第二无源混频器、第一分路器;
    所述第一信号发生器发送所述第一本振信号具体包括:
    所述第一信号发生器向所述第二合路器发送所述第一本振信号;
    所述方法还包括:
    所述第二信号发生器产生第二本振信号,并向所述第二合路器发送所述第二本振信号;
    所述第二合路器接收所述第一信号发生器发送的所述第一本振信号、以及所述第二信号发生器发送的所述第二本振信号,并对所述第一本振信号和所述第二本振信号进行合路处理,形成第一合路信号 后经所述无源DAS线路向所述第一分路器发送;
    所述第一分路器接收所述第一合路信号,将所述第一合路信号中的信号分离出来,获取所述第一本振信号后向所述第一无源混频器发送,获取所述第二本振信号后向所述第二无源混频器发送;
    所述第三天线接收具有第一射频频段的第三上行射频信号,并向所述第二无源混频器发送所述具有第一射频频段的第三上行射频信号;
    所述第二无源混频器接收所述第一分路器发送的所述第二本振信号、以及所述第三天线发送的所述具有第一射频频段的第三上行射频信号,利用所述第二本振信号对所述具有第一射频频段的第三上行射频信号进行混频处理,形成具有第三射频频段的上行射频信号后向所述第一合路器发送;其中,所述第三射频频段与所述第二射频频段互不重叠;
    所述第一合路器接收所述第二无源混频器发送的所述具有第三射频频段的上行射频信号,将所述具有第三射频频段的上行射频信号合路在所述上行射频合路信号内经所述无源DAS线路向所述第二分路器发送;
    所述第二分路器获取所述具有第三射频频段的上行射频信号后向所述第二混频器发送;
    所述第二混频器接收所述第二分路器发送的所述具有第三射频频段的上行射频信号;
    所述第二混频器利用所述第二信号发生器产生的所述第二本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送;或者,
    利用所述第二混频器产生的本振信号对所述具有第三射频频段的上行射频信号进行混频处理,形成所述具有第一射频频段的第三上行射频信号后向所述信宿发送。
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