WO2016127367A1 - Dispositif de communication, système de communication, procédé d'envoi de signal et procédé de réception de signaux - Google Patents

Dispositif de communication, système de communication, procédé d'envoi de signal et procédé de réception de signaux Download PDF

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Publication number
WO2016127367A1
WO2016127367A1 PCT/CN2015/072919 CN2015072919W WO2016127367A1 WO 2016127367 A1 WO2016127367 A1 WO 2016127367A1 CN 2015072919 W CN2015072919 W CN 2015072919W WO 2016127367 A1 WO2016127367 A1 WO 2016127367A1
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Prior art keywords
signal
time slot
length
subband
filter
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Chinese (zh)
Inventor
吴丹
陈磊
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2015/072919 priority Critical patent/WO2016127367A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present invention relates to the field of communications, and in particular, to a communications device, a communications system, a signal transmitting method, and a signal receiving method.
  • Orthogonal Frequency Division Multiplexing is a widely used multi-carrier modulation technique. By dividing the data stream into multiple parallel sub-carriers, each sub-carrier can be used with lower frequency. The data rate, while generally achieving a higher transmission rate.
  • the main advantage of OFDM is that it can effectively combat frequency selective fading channels, and by introducing a cyclic prefix (CP), Inter Symbol Interference (ISI) can be eliminated.
  • CP cyclic prefix
  • ISI Inter Symbol Interference
  • OFDM Orthogonal frequency division multiplexing
  • IFFT Inverse Fast Fourier Transformation
  • CP CP addition
  • a low pass filter is used to limit the out-of-band leakage of the signal.
  • the above filtering is to filter the entire system bandwidth, and the out-of-band signal is limited.
  • the filtering suppresses the out-of-band, ISI is also introduced, which may cause the system performance to be degraded.
  • Embodiments of the present invention provide a communication device, a communication system, a signal transmission method, and a signal receiving method, which can reduce interference caused by a filter.
  • a first aspect of the present invention provides a communication device, including:
  • each subband configuration parameter includes a subcarrier spacing and a subband width ;
  • a guard interval adding module configured to add a guard interval to the to-be-transmitted signal on each sub-band;
  • the guard interval includes a first time slot and a second time slot; and the first time slot includes a tail of the to-be-transmitted signal a partial signal, the second time slot comprising a partial signal of the signal to be transmitted header or another partial signal of the tail;
  • a transmitting module configured to send a signal filtered by the filter.
  • the transmitting module is further configured to notify a user equipment of a length of the first time slot and a length of the second time slot, or Notifying the user equipment of the length of the first time slot and transmitting information related to the second time slot to the user equipment, so that the user equipment calculates the length of the second time slot;
  • the information includes the subcarrier spacing, the subband width, and the type of the filter for each subband.
  • the second time slot is separated by a subcarrier spacing, subband of the subband Depending on at least one of the width and filter type.
  • the length of the second time slot and the filter time domain The energy of the impulse response is primarily related; the energy portion of the filter impulse response is the portion of the impulse response for a continuous period of time in which the total energy exceeds a predetermined threshold.
  • the energy main portion of the filter time domain impulse response is different from the subband width and the filter type At least one factor is related; the larger the subband width, the smaller the length of the second time slot if the filter type is unchanged.
  • the subcarrier spacing is smaller, in the subband In the case where the width and the filter type are unchanged, the length of the second time slot is smaller.
  • the communications device further includes a merging module, configured to combine the filter-filtered signals on the at least one sub-band;
  • the module is configured to send a signal that is combined by the merge module.
  • the subband signal generating module is configured to: Decoding the transmission signal onto the corresponding sub-band; and performing inverse Fourier transform on the data to be transmitted mapped to the corresponding sub-band; the guard interval adding module is used for data of the corresponding sub-band after the inverse Fourier transform Add a guard interval.
  • the to-be-transmitted signal includes orthogonal frequency division multiplexing (OFDM) a symbol
  • the second time slot is located at a head of the OFDM symbol
  • the second time slot is filled with a signal whose tail of the OFDM symbol is equal to the length of the second time slot.
  • OFDM orthogonal frequency division multiplexing
  • the to-be-transmitted signal includes an OFDM symbol
  • the second A time slot is located at the end of the OFDM symbol
  • the second time slot is filled with a signal whose OFDM symbol header is equal to the length of the second time slot.
  • a second aspect of the present invention provides a communication device, including:
  • a receiving module configured to receive a signal including a guard interval, where the guard interval includes a first time slot and a second time slot, where the first time slot includes a partial signal of the tail of the received signal, and the second time slot Include a partial signal of the received signal header or another partial signal of the tail; the second time slot is located at the head or the tail of the received signal;
  • the de-protection interval module is configured to perform de-protection interval processing on the filtered received signal to obtain a signal after the de-protection interval.
  • the de-protection interval module pairs the filtered received signal Performing the de-protection interval specifically includes removing the first time slot from the filtered received signal, and removing a signal that the filtered received signal tail is equal to the length of the second time slot; if the second time slot is located at the The de-protection interval of the filtered received signal by the de-protection interval module specifically includes removing the first time slot and the second time slot from the filtered received signal.
  • the communications device further includes an FFT (Fast Fourier Transformation, A fast Fourier transform module is configured to perform a Fourier transform on the signal after the de-protection interval.
  • FFT Fast Fourier Transformation
  • the FFT-transformed output has a phase rotation of e -j2 ⁇ kL/M with respect to the input signal; wherein k represents a subcarrier number, M represents a total number of subcarriers, and L represents a length of the second time slot; and the communication device further includes a signal detection module. Used to compensate for phase rotation after FFT transformation.
  • a third aspect of the present invention provides a signal sending method, including:
  • each subband configuration parameter includes a subcarrier spacing and a subband width
  • the guard interval includes a first time slot of the first time slot and a second time slot;
  • the first time slot includes a part of the signal of the tail of the to-be-transmitted signal,
  • the second time slot includes a partial signal of the signal to be transmitted header or another partial signal of the tail;
  • the signal filtered by the filter is transmitted.
  • the signal sending method further includes: notifying the user equipment of the length of the first time slot and the length of the second time slot, or Notifying the user equipment of the length of the first time slot and transmitting information related to the second time slot to the user equipment, so that the user equipment calculates the length of the second time slot;
  • the information includes subcarrier spacing, subband width, and filter type for each subband.
  • the second time slot is separated by a subcarrier spacing, a subband of the subband Depending on at least one of the width and filter type.
  • the length of the second time slot and the filter time domain The main part of the energy of the impulse response is related; the main part of the energy of the impulse response of the filter is the portion of the impulse response for a continuous period of time in which the total energy exceeds a preset threshold.
  • the energy main portion of the filter time domain impulse response and the subband width and the filter class At least one of the factors is related; the larger the sub-band width, the smaller the length of the second time slot if the filter type is unchanged.
  • the subcarrier spacing is smaller, in the subband In the case where the width and the filter type are unchanged, the length of the second time slot is smaller.
  • the signal transmitting method further includes combining the filter-filtered signals on the at least one sub-band.
  • Processing the data to generate a signal to be transmitted on the at least one subband includes: mapping the to-be-transmitted signal to a corresponding sub-band after generating the to-be-transmitted signal on the at least one sub-band; and mapping The data of the corresponding sub-band is inverse-Fourier-transformed after the signal to be transmitted on at least one sub-band.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second time A slot is located at a header of the OFDM symbol
  • adding a guard interval to a signal to be transmitted on the at least one subband includes filling a signal in the second slot that is equal to a length of the second slot.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second time The slot is located at the end of the OFDM symbol
  • adding a guard interval to the to-be-transmitted signal on the at least one sub-band includes filling a signal in the second slot that is equal to the length of the second slot.
  • a fourth aspect of the present invention provides a signal receiving method, including:
  • the guard interval includes a first time slot and a second time slot; the second time slot is located at a head or a tail of the received signal; the first time slot includes the received signal a partial signal of the tail, the second time slot comprising a partial signal of the received signal header or another partial signal of the tail;
  • the filtered received signal is subjected to a de-protection interval process to obtain a signal after the de-protection interval.
  • the performing de-protection interval processing on the filtered received signal specifically includes: Removing the first time slot from the filtered received signal, and removing a signal of the filtered received signal tail equal to a length of the second time slot; if the second time slot is located at a tail of the received signal.
  • the performing the de-protection interval processing on the filtered received signal specifically includes removing the first time slot and the second time slot from the filtered received signal.
  • the signal receiving method further includes performing a Fourier transform on the signal after the de-protection interval If the second time slot is located at the head of the received signal, the FFT-converted output signal has a phase rotation of e -j2 ⁇ kL/M with respect to the input signal; wherein k represents a subcarrier number and M represents a subcarrier The total number, L, represents the length of the second time slot; if the second time slot is located at the head of the received signal, the signal receiving method further includes the step of compensating for the phase rotation.
  • a fifth aspect of the present invention provides a transmitting end communication device, including:
  • a processor configured to generate a to-be-transmitted signal on the at least one sub-band according to the at least one sub-band configuration parameter; a configuration parameter of each sub-band includes a sub-carrier spacing and a sub-band width; and the processor is further configured to use the at least one a guard interval is added to the to-be-transmitted signal on the sub-band; the guard interval includes a first time slot and a second time slot;
  • a filter for filtering a signal after the guard interval on the at least one sub-band
  • a transmitter configured to send the signal including the guard interval to the receiving device.
  • the transmitter is further configured to notify the receiving device of the length of the first time slot and the length of the second time slot, or Notifying the user equipment of the length of the first time slot and transmitting information related to the second time slot to the user equipment, so that the user equipment calculates the length of the second time slot;
  • the information includes the subcarrier spacing, subband width, and type of filter for each subband.
  • the length of the second time slot is separated by a subcarrier of the subband Depending on at least one of the width and filter type.
  • the length of the second time slot and the filter time domain impact The main part of the energy of the response is related; the main part of the energy of the filter impulse response is the portion of the impulse response for a continuous period of time in which the total energy exceeds a preset threshold.
  • the energy main portion of the filter time domain impulse response is different from the subband width and the filter type One factor is related; the larger the subband width is, the smaller the length of the second time slot is when the filter type is unchanged.
  • the subband width and the filter type are unchanged In case, the smaller the subcarrier spacing, the smaller the length of the second time slot.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second A time slot is located at a head of the OFDM symbol
  • the second time slot is filled with a signal whose tail of the OFDM symbol is equal to the length of the second time slot.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second A time slot is located at the end of the OFDM symbol
  • the second time slot is filled with a signal whose OFDM symbol header is equal to the length of the second time slot.
  • the filter is integrated in the processor.
  • a sixth aspect of the present invention provides a receiving end communication device, including:
  • a receiver configured to receive a signal including a guard interval, where the guard interval includes a first time slot and a second time slot, the second time slot being located at a head or a tail of the received signal; a part of the signal including the tail of the signal to be transmitted, the second time slot includes a part of the signal of the signal to be transmitted header or another part of the signal of the tail; a filter for filtering the received signal; and
  • the processor is configured to perform deprotection interval processing on the filtered received signal.
  • the processor performs a de-protection interval on the filtered received signal.
  • the processing specifically includes removing the first time slot from the filtered received signal, and removing a signal that the filtered received signal tail is equal to a second time slot length; if the second time slot is located in the receiving At the tail of the signal, the processor performing de-protection interval processing on the filtered received signal specifically includes removing the first time slot and the second time slot from the filtered received signal.
  • the processor is further configured to perform a Fourier transform on the signal after the de-protection interval;
  • the second time slot is located at the tail of the received signal, and the FFT-transformed output signal has a phase rotation of e -j2 ⁇ kL/M with respect to the input signal; wherein k represents a subcarrier number, and M represents a total number of subcarriers.
  • L indicates the length of the second time slot; if the second time slot is a prefix time slot, the processor is further configured to compensate the FFT-transformed phase rotation factor.
  • the filter is integrated in the processor.
  • a seventh aspect of the present invention provides a communication system, comprising: the transmitting end communication device according to any one of the possible aspects of the fifth aspect or the fifth aspect of the present invention, and any of the sixth or sixth aspect of the present invention A receiving end communication device as described in one possible implementation.
  • a first aspect of the present invention provides a communication device, including:
  • a subband signal generating module configured to generate a to-be-transmitted signal on the at least one subband according to the at least one subband configuration parameter;
  • the configuration parameter of each subband includes a subcarrier spacing and a subband width;
  • a guard interval adding module configured to add a guard interval to the to-be-transmitted signal on the at least one sub-band;
  • the guard interval includes a cyclic prefix and a second time slot;
  • a filter configured to perform a filtering operation on the guarded interval signal on the at least one subband.
  • the communications device further includes a transmitting module, configured to notify the user equipment of a length of the cyclic prefix and a length of the second time slot, or Transmitting information related to the second time slot to the user equipment, so that the user equipment can learn or calculate the length of the second time slot; the information related to the second time slot includes a sub-band sub- Carrier spacing and subband width.
  • the length of the second time slot is determined by at least two factors of a subcarrier spacing, a subband width, and a filter type of the subband. set.
  • the length of the second time slot is determined by two sub-carrier spacings and sub-band widths of the sub-band to make sure.
  • the length of the second time slot is determined by three factors: a subcarrier spacing, a subband width, and a filter type. determine.
  • the length of the second time slot is determined according to a time domain diffusion degree of the filter; a filter time domain The extent of the time domain spread of the impulse response is related to the width of the subband.
  • the communications device further includes a merge module, configured to combine the filtered signals on the at least one subband.
  • the communications device further includes a subcarrier mapping module, And mapping a signal to be transmitted on the at least one sub-band.
  • the communications device further includes an IFFT transform module, configured to map the subcarrier mapping module The data of the corresponding sub-band is subjected to inverse Fourier transform, and the guard interval adding module is configured to add a guard interval process to the data of the corresponding sub-band after the inverse Fourier transform.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second A time slot is located at a head of the OFDM symbol
  • the second time slot is filled with a signal whose tail of the OFDM symbol is equal to the length of the second time slot.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second A time slot is located at the end of the OFDM symbol
  • the second time slot is filled with a signal whose OFDM symbol header is equal to the length of the second time slot.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second time slot is located at the tail of the OFDM symbol
  • the padding symbol in the second time slot is "0".
  • a second aspect of the present invention provides a communication device, including:
  • a receiving module configured to receive a signal including a guard interval;
  • the guard interval includes a cyclic prefix and a second time slot, where the second time slot is a special prefix time slot or a special suffix time slot;
  • the second time slot is a special suffix time slot, it is used to remove the cyclic prefix and the special suffix time slot.
  • the receiver further includes an FFT module, configured to perform a Fourier transform on the signal after the de-protection interval; if the second time slot is For the prefix slot, the FFT-transformed output signal has a phase rotation of e -j2 ⁇ kL/M with respect to the input signal; wherein k represents the subcarrier number, M represents the total number of subcarriers, and L represents the length of the second slot.
  • FFT module configured to perform a Fourier transform on the signal after the de-protection interval; if the second time slot is For the prefix slot, the FFT-transformed output signal has a phase rotation of e -j2 ⁇ kL/M with respect to the input signal; wherein k represents the subcarrier number, M represents the total number of subcarriers, and L represents the length of the second slot.
  • the receiver further includes a signal detecting module, if the second time slot is a prefix time slot, The signal detection module is configured to compensate the phase rotation factor after the FFT transformation.
  • the length of the second time slot is determined by at least two factors of a subcarrier spacing, a subband width, and a filter type of the subband .
  • the length of the second time slot is different from the subcarrier spacing and the subband width of the subband to make sure.
  • the length of the second time slot is determined by three factors: a subcarrier spacing, a subband width, and a filter type. determine.
  • the length of the second time slot is determined according to a time domain diffusion degree of the filter; a filter time domain The extent of the time domain spread of the impulse response is related to the width of the subband.
  • a third aspect of the present invention provides a signal sending method, including:
  • the configuration parameter of each sub-band includes a sub-carrier spacing and a sub-band width;
  • the guard interval includes a cyclic prefix and a second time slot
  • the signal sending method further includes: a length of the cyclic prefix and a length of the second time slot to notify the user equipment, or the second time
  • the slot related information is sent to the user equipment, so that the user equipment can learn or calculate the length of the second time slot;
  • the information related to the second time slot includes a subcarrier spacing and a subband width of each subband.
  • the length of the second time slot is determined by at least two factors of a subcarrier spacing, a subband width, and a filter type of the subband .
  • the length of the second time slot is determined by the sub-band Carrier spacing and subband width are determined by two factors.
  • the length of the second time slot is separated by a subcarrier, Subband width and filter type are determined by three factors.
  • the length of the second time slot is determined according to a time domain diffusion degree of the filter; a filter time domain The extent of the time domain spread of the impulse response is related to the width of the subband.
  • the signal transmitting method further includes combining the filtered signals on the at least one subband.
  • the signal sending method further includes generating at least one subband Mapping the to-be-transmitted signal on the at least one sub-band after the signal to be transmitted.
  • the signal sending method further includes: performing data of the corresponding subband after mapping the to-be-transmitted signal on the at least one sub-band Inverse Fourier transform.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second A time slot is located at a head of the OFDM symbol
  • adding a guard interval to the to-be-transmitted signal on the at least one sub-band includes filling a signal in the second time slot that is equal to a length of the second time slot.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second The time slot is located at the end of the OFDM symbol
  • adding a guard interval to the to-be-transmitted signal on the at least one sub-band includes filling a signal in the second time slot that is equal to the length of the second time slot.
  • the to-be-transmitted signal includes an OFDM symbol, where The second time slot is located at the end of the OFDM symbol, and the padding symbol in the second time slot is "0".
  • a fourth aspect of the present invention provides a signal receiving method, including:
  • the guard interval includes a cyclic prefix and a second time slot, and the second time slot is a special prefix time slot or a special suffix time slot;
  • the second time slot is a prefix time slot, used to remove the cyclic prefix from the received signal, and remove a signal whose tail of the received signal is equal to the length of the second time slot; or a special suffix in the second time slot In the case of a time slot, it is used to remove the cyclic prefix and the special suffix time slot.
  • the received signal includes a signal of at least one subband
  • the signal receiving method further includes determining a configuration parameter of the at least one subband, the configuration The parameters include subcarrier spacing and subband width.
  • the signal receiving method further includes selecting a suitable filter according to the configuration parameter of the at least one subband.
  • the signal receiving method further includes performing a Fourier transform on the signal after the de-protection interval; if the second time slot is a prefix time slot, The FFT-transformed output signal has a phase rotation of e -j2 ⁇ kL/M with respect to the input signal; where k represents the subcarrier number, M represents the total number of subcarriers, and L represents the length of the second slot.
  • the signal receiving method further includes performing an FFT transformation The latter phase rotation factor is compensated.
  • a fifth aspect of the present invention provides a communication device, including:
  • a processor configured to generate a to-be-transmitted signal on the at least one sub-band according to the at least one sub-band configuration parameter; a configuration parameter of each sub-band includes a sub-carrier spacing and a sub-band width; and the processor is further configured to use the at least one a guard interval is added to the to-be-transmitted signal on the sub-band; the guard interval includes a cyclic prefix and a second time slot; the processor includes a filter, configured to perform a guard-protected signal on the at least one sub-band Filtering operation; and
  • a transmitter configured to send the signal including the guard interval to the receiving device.
  • the transmitter is further configured to notify the receiving device of the length of the cyclic prefix and the length of the second time slot, or The time slot related information is sent to the user equipment, so that the user equipment can learn or calculate the length of the second time slot; the information related to the second time slot includes the subcarrier spacing and the subband width of each subband. .
  • the length of the second time slot is determined by two factors of a subcarrier spacing and a subband width of the subband.
  • the length of the second time slot is determined by three factors: a subcarrier spacing, a subband width, and a filter type.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second A time slot is located at a head of the OFDM symbol
  • the second time slot is filled with a signal whose tail of the OFDM symbol is equal to the length of the second time slot.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second time The slot is located at the end of the OFDM symbol
  • the second slot is filled with a signal whose header of the OFDM symbol is equal to the length of the second slot.
  • a sixth aspect of the present invention provides a communication device, including:
  • a receiver configured to receive a signal including a guard interval;
  • the guard interval includes a cyclic prefix and a second time slot, the second time slot is a special prefix time slot or a special suffix time slot;
  • the receiver includes a filter, For filtering the signal including the guard interval;
  • the processor when the second time slot is a prefix time slot, is configured to remove the cyclic prefix from a received signal, and remove a signal whose tail of the received signal is equal to a length of the second time slot; or in the second time slot When it is a special suffix time slot, it is used to remove the cyclic prefix and the special suffix time slot.
  • the receiver receiving signal includes a signal of at least one subband
  • the processor is further configured to determine a configuration parameter of the at least one subband
  • the configuration parameters include subcarrier spacing and subband width.
  • the processor is further configured to perform a Fourier transform on the signal after the de-protection interval; if the second time slot is a prefix time slot, The FFT-transformed output signal has a phase rotation of e -j2 ⁇ kL/M with respect to the input signal; where k represents the subcarrier number, M represents the total number of subcarriers, and L represents the length of the second slot.
  • the processor is further configured to perform FFT The transformed phase rotation factor is compensated.
  • a seventh aspect of the present invention provides a communication device including a transmitter, a receiver, and a processor, the transmitter for transmitting a signal to be transmitted including at least one subcarrier, and the receiver for receiving at least one sub a signal to be received by the carrier; the processor includes a filter for performing filtering processing on the to-be-transmitted signal or the to-be-received signal, and the processor performs a guard interval processing on the to-be-transmitted signal or the to-be-processed
  • the received signal is subjected to a de-protection interval process, and the guard interval includes a cyclic prefix and a second time slot.
  • the second time slot is a special prefix time slot or a special suffix time slot.
  • the foregoing communication device and the signal transmitting and receiving method use a cyclic prefix to eliminate multipath interference, and use a special prefix time slot or a special suffix time slot to eliminate interference caused by filtering, which can effectively improve communication quality.
  • FIG. 1 is a functional block diagram of a communication device for transmitting downlink data according to Embodiment 1 of the present invention
  • 2 is a schematic structural diagram of an OFDM symbol, the head of the OFDM symbol having a cyclic prefix
  • 3A-3C are diagrams showing different time domain impulse responses of filters when different subcarrier spacings or subband widths are used;
  • Figure 4 shows a schematic diagram of the overlap between adjacent symbols
  • FIG. 5 is a diagram showing a comparison of BLER (Block Error Ratio) performance after adding only the first time slot and adding the first time slot and the second time slot;
  • BLER Block Error Ratio
  • FIG. 6 is a functional block diagram of a communication device for receiving downlink data according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic diagram of de-cyclicizing prefix and de-tailing data of an OFDM symbol when the communication device shown in FIG. 6 receives a signal;
  • FIG. 8 is a functional block diagram of a communication device for transmitting an uplink signal according to Embodiment 2 of the present invention.
  • FIG. 9 is a functional block diagram of a communication device for transmitting a signal according to Embodiment 3 of the present invention.
  • FIG. 10 is a schematic structural diagram of an OFDM symbol, the head and the tail of the OFDM symbol are respectively added with a cyclic prefix and a suffix;
  • FIG. 11 is a functional block diagram of a communication device for receiving a signal according to Embodiment 3 of the present invention.
  • FIG. 12 is a schematic diagram of de-ringing a prefix and a suffix of an OFDM symbol when the communication device shown in FIG. 11 receives a signal;
  • FIG. 13 is a flowchart of a signal sending method according to an embodiment of the present invention.
  • FIG. 14 is a flowchart of a signal receiving method according to an embodiment of the present invention.
  • FIG. 15 is a schematic structural diagram of a communication device for transmitting a signal according to an embodiment of the present invention.
  • FIG. 16 is a structural diagram of a communication device for receiving a signal according to an embodiment of the present invention.
  • FIG. 17 is a structural diagram of a communication system according to an embodiment of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • the communication device and the communication method in the embodiments of the present invention may employ techniques such as OFDM, Discrete Fourier Transform Extended OFDM (referred to as DFT-S-OFDM).
  • a communication device 100 can be configured to send a signal to a peer device, including an acquisition module 105 , a subband signal generation module 110 , a cyclic prefix module 140 , a filter 150 , a merge module 160 , and The transmitting module 170.
  • the communication device 100 is configured to send The line signal is sent to a receiving device (such as a user device).
  • the communication device 100 may also be configured to transmit an uplink signal.
  • the acquisition module 105 is configured to acquire data to be sent, and the subband signal generation module 110 is configured to process the to-be-sent data to generate a to-be-transmitted signal on one or more sub-bands.
  • the subband signal generating module 110 is configured to determine configuration parameters of each subband, and generate data to be sent of each subband.
  • the configuration parameters include parameters such as subcarrier spacing and subband width.
  • the effective data bandwidth of the system is 18 MHz, and is equally divided into two sub-bands, wherein the sub-band 1 has a sub-carrier spacing of 15 kHz, occupying a continuous 9 MHz bandwidth representing low frequency;
  • the subcarrier spacing of Band 2 is 30 KHz, taking up a continuous 9 MHz bandwidth representing high frequencies.
  • the subband signal generation module 110 includes a subcarrier mapping module 120 and an IFFT (Inverse Fast Fourier Transform) transform module 130.
  • IFFT Inverse Fast Fourier Transform
  • the subcarrier mapping module 120 is configured to map data to be sent to a specific subcarrier, and the correspondence between the to-be-transmitted data and a specific subcarrier is generally determined by a resource scheduling function in the communication system. For example, in a cellular communication system, a base station typically schedules its data onto specific subcarriers based on the channel state information of the terminal. The subcarriers of the unmapped data are padded with 0, so that the data length after padding 0 is equal to the number of IFFT transform points, and is ready for the next IFFT transform.
  • each subband needs to be consistent.
  • each valid data subcarrier is mapped to the scheduled location, and other subcarriers that are not mapped with valid data are padded with 0s.
  • the IFFT conversion module 130 is configured to perform IFFT transformation on the data after subcarrier mapping.
  • the data of each subband is mapped by the subcarrier mapping module 120 before being subjected to IFFT conversion.
  • the number of points of the IFFT transform is determined by the system bandwidth and the subcarrier spacing of the subbands. For In order to make the subsequent processing simple, the appropriate IFFT transform points can be selected, so that the signal sampling rates of different sub-bands after IFFT transform are the same. In the above example, the number of IFFT conversion points of the subband 1 is 2048, and the number of IFFT conversion points of the subband 2 is 1024. After the IFFT transform, the sampling rates of the two subbands are the same. Otherwise, before the data of different sub-bands is merged, it is necessary to increase the module of the variable sampling rate so that the sampling rates of the respective sub-bands are consistent.
  • the cyclic prefix module 140 adds a cyclic prefix to the IFFT-transformed data of the corresponding sub-band.
  • the role of the cyclic prefix CP is to counter the ISI caused by the channel multipath delay, and its length is usually set to a value larger than the maximum multipath delay of the channel.
  • the filtering in addition to inter-symbol interference caused by multipath, the filtering itself will also cause intersymbol interference.
  • the ISI intensity caused by filtering is mainly related to three factors:
  • Subcarrier spacing This is because the length of the OFDM symbols other than the CP is the reciprocal of the subcarrier spacing. Under the premise of the filter determination, the shorter the OFDM symbol, the stronger the ISI brought by the filter, and vice versa.
  • Subband width According to the basic principle of the filter, the wider the passband, the smaller the degree of time domain diffusion of the filter's time domain impulse response, and vice versa.
  • the cyclic prefix CP includes a first time slot CP_C and a second time slot CP_F, which can be used not only to combat multipath interference but also to counter the ISI caused by the filter.
  • Figure 2 shows the CP diagram of one of the subbands. The CP is divided into two parts, where the cyclic prefix CP_C represents the ISI used to combat the channel multipath, and the special prefix slot CP_F is used to counter the filter. ISI.
  • the CP-filled signal is a signal that replicates the OFDM symbol tail equal to the total length of the CP.
  • the length of CP_C can be set according to the prior art, for example, the length of CP_C can be set.
  • the value is set to be greater than the maximum multipath delay of the channel; the length of the CP_F may be determined by the communication device 100, and the receiving device is notified, or the parameter related to the length of the CP_F is sent to the receiving device, and the receiving device calculates the CP_F according to the parameter. length.
  • CP_F The purpose of CP_F is to counter the ISI interference introduced by the filter.
  • the length of the filter's time domain impulse response can be selected as the CP_F length.
  • CP_F will be very long, and the overhead will increase due to the excessive CP_F. Therefore, the present invention only considers the main part of the energy response of the filter by the time domain.
  • the length of CP_F can be chosen to be close to the main part of the energy of the filter impulse response to isolate the interference, while at the same time eliminating most of the ISI.
  • the main part of the energy is the most powerful part of the filter impulse response center.
  • the filter impulse response here refers to the impulse response of the filter of the transmitting end communication device, or the combined impulse response of the filter of the transmitting end communication device and the receiving end communication device.
  • Fig. 3A shows a filter impulse response with a sampling rate of 30.72 MHz and a subband width of 0.9 MHz.
  • the length of CP_F can be set to 40 sampling intervals to isolate the ISI interference caused by the filter.
  • Figure 3A shows the response of a filter with a subband width of 0.9 MHz
  • Figure 3B shows the impulse response of the same filter with a subband width of 1.8 MHz. The main part of the energy becomes narrower, so a shorter CP_F length can be used.
  • Filter type Although the sub-band width has a great influence on the main part of the filter energy, the impact response of the filter designed by different filter design methods and different filter design parameters will still be different.
  • the subcarrier spacing is also a factor in setting CP_F. This is because the ISI strengths that can be tolerated at different subcarrier intervals are different. In general, the smaller the subcarrier spacing, the longer the time domain symbol, and the interference between symbols without the filter being unchanged. The resulting ISI is smaller. At this point you can choose a smaller CP_F length to reduce overhead. As shown in FIG. 3C, the filter in FIG. 3A is still used. If the subcarrier spacing is small at this time, the length of CP_F can be reduced. For example, the length of CP_F is only set to 20 sampling intervals.
  • the length of CP_F is mainly determined by at least one of three factors: subband width, filter type, and subcarrier spacing. In actual implementation, it can be determined by the following methods:
  • the length of CP_F is determined by the width of the subband.
  • the subband width is the most important factor affecting CP_F.
  • the time domain impulse response energy of the filter corresponding to the subband width is mainly Partial decision.
  • the length of CP_F is determined by the subband width and the subcarrier spacing.
  • the length of CP_F is primarily determined by the subband width and subcarrier spacing. As shown in Table (1): CP_F lengths with different subcarrier spacings and different subband widths can be defined in advance. The CP_F length can be obtained by the configuration of subcarrier spacing and subband width. L ij is expressed in Table (1). The subcarrier spacing represented by the i-th row and the j-th column corresponds to the CP_F length corresponding to the sub-band width.
  • Table (1) Determine the CP_F length based on the subband width and subcarrier spacing
  • the length of CP_F is determined by the subband width and the filter type:
  • the length of the CP_F can be determined jointly according to the subband width and the filter type. As shown in Table (2): CP_F length under different sub-band widths and different filter types can be defined in advance, and CP_F length can be obtained by sub-band width and filter type configuration. L ij in Table (1) Indicates the CP_F length corresponding to the filter type and subband width indicated by the i-th row and the j-th column.
  • Table (2) Determine the CP_F length based on the subband width and filter type
  • CP_F The length of CP_F is determined by the subband width, subcarrier spacing and filter type:
  • the filter itself may have multiple options, in which case different CP_F lengths can be configured for different filters.
  • the length of CP_F is determined by three factors. The length of the CP_F corresponding to the p-th filter corresponding to the sub-carrier spacing and the sub-band width indicated by the i-th row and the j-th column is indicated. The length of CP_F is determined according to three parameters of subcarrier width, subcarrier spacing, and filter type.
  • CP_F The length of CP_F is determined by the subband width, subcarrier spacing and filter type.
  • the filter 150 filters each sub-band to control interference between sub-bands at an acceptable level. As shown in FIG. 4, after filtering, the OFDM symbols are expanded, and both sides are smeared and overlapped with adjacent symbols. This filtering causes ISI.
  • the merge module 160 adds the signals of the respective sub-bands. It should be pointed out that since each sub-band adopts different sub-carrier spacing and CP length parameters, the symbol lengths are no longer the same, and strict symbol synchronization cannot be achieved between sub-bands. In the case of merging, it is only necessary to add samples by sampling in chronological order, regardless of the symbol alignment relationship.
  • the transmitting module 170 is configured to send a signal synthesized by the combining module 160 to the receiving device, and notify the user equipment of the length of the cyclic prefix CP_C against the multipath interference and the length of the special prefix slot CP_F, or The parameters related to the length of the CP_C and the length of the CP_F are sent to the user equipment, and the user equipment can determine the length of the CP_C and the length of the CP_F according to the parameters.
  • the transmitting module 170 includes one or more antennas.
  • Figure 5 shows a simulation result. Compared with the scheme with only the first time slot CP_C, the performance of the BLER (Block Error Ratio) is significantly improved after the second time slot CP_F is added.
  • BLER Block Error Ratio
  • a communication device 200 is configured to receive a signal sent by the communication device 100.
  • the communication device 200 includes a receiving module 210, a filter 220, a de-cyclic prefix module 230, and an FFT (Fast Fourier Transformation). , Fast Fourier Transform) transform module 240 and signal detection module 250.
  • the communication device 200 is configured to receive a downlink signal. In other embodiments of the present invention, the communication device 200 may also be configured to receive an uplink signal.
  • the receiving module 210 is configured to receive a signal transmitted by the communication device 100, where the signal is a composite signal of each sub-band signal.
  • the receiving module 210 includes one or more antennas.
  • the receive signal of the receiving module 210 can be divided into one or more sub-band signals corresponding to the sub-band signals of the transmitting end, so that the sub-band signals are independently processed.
  • the filter 220 filters each subband signal.
  • the filter may be a matched filter corresponding to the transmitter filter, or any filter corresponding to the corresponding subband width.
  • the de-cycle prefix module 230 removes the CP_C against the channel multipath, while the CP_F of the CP backend is reserved. Correspondingly, the signal at the end of the OFDM symbol equal to the length of CP_F is also removed to maintain the original symbol length. As shown in Figure 7, after the CP is removed, the remaining signal portion of the FFT block contains the complete information of an OFDM symbol, and the trailing letter of the adjacent symbol. Most of the energy of the number is excluded from the FFT block.
  • the above-mentioned de-CP process is equivalent to performing a cyclic right shift of the L CP_F point for a valid symbol of the transmitting end, and L CP_F indicates the length of the CP-F. Therefore, the FFT transforms to the frequency domain symbol with respect to the signal at the transmitting end. Phase rotation. Where k is the subcarrier number and M is the total number of subcarriers.
  • the FFT module 240 is configured to perform FFT transformation on signals of the corresponding subbands.
  • the number of points of the FFT transformation is the same as that of the transmitting end.
  • the signal detection module 250 is configured to detect the quality of each sub-band signal and compensate for the phase rotation during signal detection.
  • a communication device 300 can be configured to send a signal to a peer device, including an acquisition module 360 for acquiring a signal to be transmitted, a subband signal generation module 370, and the subband signal generation module 370.
  • the subcarrier mapping module 310 for mapping data to be transmitted and the IFFT conversion module 320 for performing IFFT transformation on the mapped data are included.
  • the communication device 300 further includes a cyclic prefix module 330 for adding a cyclic prefix to the IFFT-transformed data, a filter 340, and a transmitting module 350 for transmitting signals.
  • the functions and principles of the modules of the communication device 300 are similar to those of the corresponding modules of the communication device 100 (see FIG. 1) in the first embodiment, and will not be described in detail.
  • the communication device 300 may be a user equipment UE, configured to send uplink data.
  • the data of multiple UEs is not combined and uplink transmission is performed separately.
  • the structure of the communication device at the receiving end is basically the same as that of the communication device 200 (see FIG. 6) described in the first embodiment, and details are not described herein.
  • a communication device 500 includes an acquisition module 505 , a sub-band signal generation module 510 , a cyclic prefix and suffix module 540 , a filter 550 , a merge module 560 , and a transmission module 570 .
  • the subband signal generating module 510 includes a subcarrier mapping module 520 and an IFFT transform module 530.
  • the communications device 500 is configured to send a downlink signal to a peer device (such as a user device). In other embodiments of the present invention, the communication device 500 can also be used to transmit an uplink signal.
  • the communication device 100 introduced in the above embodiment 1 adopts the ISI added by the cyclic prefix module 140 against the multipath and the ISI caused by the anti-filter; and the communication device 500 shown in FIG. 9 adopts the cyclic prefix and the suffix.
  • the module 540 is designed to counter the ISI caused by multipath and the ISI caused by the filter.
  • the method of adding the cyclic prefix CPre is to copy a segment of the signal at the end of the OFDM symbol to the front of the symbol; and adding the cyclic suffix CPost is to copy a segment of the signal of the OFDM symbol to the back of the symbol (see FIG. 10 for details), determining the length of the CPost.
  • the method is the same as the method for determining the length of the CP-F described in the first embodiment.
  • the cyclic suffix CPost may also be obtained without data copying of the OFDM symbol header, but directly adding "0", which may also have the effect of against the ISI introduced by the filtering.
  • the structure of the communication device 600 at the receiving end is as shown in FIG. 11, which includes a receiving module 610, a filter 620, a de-cyclic prefix and suffix module 630, an FFT conversion module 640, and a signal detecting module. 650.
  • the difference from the communication device 200 of the receiving end described in the first embodiment is that the de-cyclic prefix module is replaced with the de-cyclic prefix and suffix module 630.
  • the de-cyclic prefix and suffix are implemented by removing the cyclic prefix and the cyclic suffix of the received signal. After the de-cyclic prefix and the de-circulating suffix, the main part of the signal is completely preserved, and the tailing of the tail from the next symbol is removed from the main part of the energy.
  • the communication device at the transmitting end may be a network side device or a user equipment
  • the user equipment at the receiving end may be a user equipment or a network side device
  • the signal transmitted by the transmitting end and the receiving end may be an OFDM signal and a discrete Fourier transforms extend OFDM signals or other types of signals.
  • the communication device at the transmitting end adds a module by using a guard interval (such as the above The cyclic prefix module 140 or the cyclic prefix and suffix module 540) adds a guard interval to the signal to be transmitted, and the guard interval includes a first time slot against multipath interference (such as CP_C shown in FIG. 2 or FIG. 10). CPre) and a second time slot (such as CP_F as shown in FIG. 2 or CPost shown in FIG. 10) for combating interference caused by filtering.
  • a guard interval such as the above The cyclic prefix module 140 or the cyclic prefix and suffix module 540
  • the guard interval includes a first time slot against multipath interference (such as CP_C shown in FIG. 2 or FIG. 10).
  • CPre CPre
  • CP_F as shown in FIG. 2 or CPost shown in FIG. 10
  • the receiving end communication device performs deprotection interval processing on the received signal by using a de-protection interval module (such as the above-described de-cyclic prefix module 230 or the de-cyclic prefix and suffix module 630), for example, the guard interval is a cyclic prefix CP (see FIG. 2).
  • the guard interval includes a cyclic prefix and a suffix (see FIG. 10)
  • the cyclic prefix and the suffix are removed ( See Figure 12).
  • the interference caused by the multipath of the channel can be reduced, the interference caused by the filtering can be reduced, and the communication quality can be effectively improved.
  • a method for transmitting a signal by using the foregoing communication device includes the following steps:
  • step S02 Process the data to be sent according to the at least one subband configuration parameter to generate a to-be-transmitted signal on the at least one subband; each subband configuration parameter includes a subcarrier spacing and a subband width, etc.; step S02 further includes :
  • the data to be sent is mapped to the corresponding subcarrier according to the scheduled result, and the subcarriers of the unmapped data are padded with 0, so that the data length after the padding is equal to the number of IFFT transform points, and is ready for the next IFFT transformation;
  • the IFFT transform is performed on the data of the corresponding subbands through the subcarrier mapping.
  • the number of points of the IFFT transform is determined by the system bandwidth and the subcarrier spacing of the subbands.
  • the principle is that the signal sampling rates of the different subbands after IFFT conversion are the same;
  • S03 Add a guard interval to the data of the corresponding sub-band after the IFFT transform.
  • the guard interval includes a cyclic prefix against multipath interference and a special prefix slot or special for combating interference caused by filtering.
  • S06 notify the receiving device of the length of the guard interval, the length of the guard interval including the length of the first time slot against multipath interference and the length of the second time slot used to counter the interference caused by the filtering; or the first Notifying the user equipment of the length of the time slot and transmitting information related to the second time slot to the user equipment, so that the user equipment can calculate the length of the second time slot;
  • the information related to the second time slot includes Information such as subcarrier spacing, subband width, and filter type for each subband.
  • a method for receiving a signal by using the foregoing communication device includes the following steps:
  • S11 receiving, by the transmitting end, a signal that includes a guard interval, where the guard interval includes a first time slot against multipath interference and a second time slot for preventing interference caused by filtering; the second time slot is located in the Receiving a header or a tail of the signal; the first time slot includes a partial signal of the tail of the received signal, and the second time slot includes a partial signal of the received signal header or another partial signal of the tail;
  • S12 Determine configuration parameters of at least one subband, where the configuration parameters include a subcarrier spacing and a subband width.
  • S13 Select an appropriate filter according to the configuration parameter of the at least one subband; if the subband configuration information has a corresponding relationship with the filter used by the transmitting end, the receiving end may select the same filter as the transmitting end according to the subband configuration information. In addition, the receiving end can also select the filter by itself.
  • the passband width of the filter should be equal to the subband width, and have a narrow transition band and appropriate out-of-band attenuation, so that the filtered signal contains less other Subband interference;
  • S15 Perform deprotection interval processing on the filtered signal, for example, when the guard interval is a cyclic prefix CP (see FIG. 2), remove the CP_C component of the cyclic prefix CP and remove the data of the tail equal to the length of the CP_F (see FIG. 6). ); or when the guard interval is the cyclic prefix CPre and the suffix CPost (see Figure 9), remove the cyclic prefix and suffix (see Figure 11);
  • S16 Perform FFT transformation on the signal of the corresponding subband; if the second time slot is the cyclic prefix CP_F, the FFT transforms to the signal of the frequency domain symbol relative to the transmitting end. Phase rotation; if the second time slot is the suffix CPost, no phase rotation is generated;
  • a transmitting communication device 100A is configured to transmit a signal to a peer device, including a transmitter 10A, a processor 20A, and a memory 30A.
  • the transmitter 10A is configured to transmit a signal including a guard interval; the guard interval includes a first time slot against multipath interference (CP_C as shown in FIG. 2 or CPre shown in FIG. 10) and used for anti-filtering
  • the second time slot of the interference (CP_F as shown in Figure 2 or CPost shown in Figure 10).
  • the second time slot is a special prefix time slot or a special suffix time slot, and can be set at the head or the tail of the signal to be transmitted.
  • the processor 20A is configured to generate a to-be-transmitted signal on the at least one sub-band according to the at least one sub-band configuration parameter; the configuration parameter of each sub-band includes a sub-carrier spacing and a sub-band width; the processor is further configured to: A guard interval is added to the to-be-transmitted signal on the at least one sub-band; the guard interval includes a cyclic prefix for combating multipath interference and a second time slot for combating interference caused by filtering.
  • the transmitting communication device 100A further includes a filter for performing a filtering operation on the signal including the guard interval.
  • the filter may be installed in the form of hardware in the transmitting communication device 100A; the filter may also be integrated in the processor 20A to process signals at the processor 20A The signal is filtered during the process.
  • the length of the second time slot is determined by at least one of a subcarrier spacing, a subband width, and a filter type of the subband.
  • the length of the second time slot is related to a main part of the energy of the filter time domain impulse response; the main part of the energy of the filter impulse response refers to a continuous time period in which the total energy exceeds a preset threshold value. Response section.
  • the energy main portion of the filter time domain impulse response is related to at least one of the subband width and the filter type; the larger the subband width is, the second is the filter type unchanged, the second The smaller the length of the time slot.
  • the memory 30A is used to store various parameters of a signal to be transmitted, a signal processing program, and the like.
  • the transmitter 10A is further configured to notify the receiving device of the length of the cyclic prefix and the length of the second time slot, or notify the user equipment of the length of the first time slot and associate with the second time slot.
  • the information is sent to the user equipment, so that the user equipment can calculate the length of the second time slot; the information related to the second time slot includes subcarrier spacing, subband width and filter type of each subband.
  • the to-be-transmitted signal includes an OFDM symbol
  • the second time slot is located at a header of the OFDM symbol
  • the second time slot is filled with the OFDM symbol tail equal to the second time slot length signal of.
  • the second time slot is located at a tail of the OFDM symbol, and the second time slot is filled with a signal that the OFDM symbol header is equal to the second time slot length or at the second time Fill the gap with 0.
  • a receiving end communication device 100B is configured to receive signals of a peer device, including a receiver 10B, a processor 20B, and a memory 30B.
  • the receiver 10B is configured to receive a signal including a guard interval; the guard interval includes a cyclic prefix for combating multipath interference and a second time slot for combating interference caused by filtering, the second time slot is A special prefix time slot or a special suffix time slot is provided at the head or the tail of the received signal.
  • the processor 20B when the second time slot is a prefix time slot, is configured to remove the cyclic prefix for combating multipath interference from the received signal, and remove the tail of the received signal equal to the length of the second time slot. a signal; or when the second time slot is a special suffix time slot, for removing the cyclic prefix and the special suffix time slot for combating multipath interference.
  • the receiving end communication device 100B further includes a filter for performing a filtering operation on the received signal including the guard interval.
  • the filter may be installed in the receiving end communication device 100B in hardware form; the filter may also be integrated in the processor 20B to filter the signal during processing of the signal by the processor 20B.
  • the memory 30B is used to store various parameters of a received signal, a signal processing program, and the like.
  • the receiver 10B receives a signal including at least one subband, and the processor is further configured to determine configuration parameters of the at least one subband, the configuration parameters including a subcarrier spacing and a subband width.
  • the processor is further configured to perform a Fourier transform on the signal after the de-protection interval; if the second time slot is a prefix time slot, the FFT-transformed output signal has an e- j2 ⁇ kL/M with respect to the input signal. Phase rotation; where k represents the subcarrier number, M represents the total number of subcarriers, and L represents the length of the second slot.
  • the processor is further configured to compensate for the phase-rotation factor after the FFT transformation if the second time slot is a prefix time slot.
  • a communication system includes a transmitting communication device 100A and a receiving communication device 100B, and the transmitting communication device 100A can be configured to transmit a signal including a guard interval; the guard interval includes The first time slot against the multipath interference and the second time slot used to counter the interference caused by the filtering, the second time slot is a special prefix time slot or a special suffix time slot; the receiving end communication device 100B can And receiving the signal including the guard interval and performing de-protection interval processing on the received signal.
  • the specific components and functions of the transmitting end communication device 100A and the receiving end communication device 100B are described in detail in the foregoing embodiments, and are not described again.
  • DFT-s-OFDM is a low PAPR signal transmission technology based on OFDM technology. Different from OFDM, DFT-s-OFDM needs to be processed before subcarrier mapping. The DFT transform is to be performed on the signal to be transmitted. Operations such as subcarrier mapping, IFFT conversion, and addition of a cyclic prefix are the same as those of the OFDM technique.
  • the technical solutions related to the present invention can be used in the DFT-s-OFDM technology, and the difference between the OFDM and the OFDM is only whether the signal to be transmitted in the sub-band signal generating module is DFT-transformed, and the other operations are two.
  • the people are all the same.
  • the processor may be a central processing unit (“CPU"), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and dedicated processors. Integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

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Abstract

L'invention concerne un dispositif de communication et un procédé d'envoi et de réception de signaux, lesquels utilisent un préfixe cyclique pour éliminer l'interférence de chemins multiples et utilisent une fenêtre de temps de préfixe spéciale ou une fenêtre de temps de postfixe spéciale pour éliminer l'interférence causée par le filtrage, améliorant ainsi la qualité de communication efficacement. Le dispositif de communication comprend un module de génération de signal de sous-bande, un module d'ajout d'intervalle de garde, un filtre et un module d'émission. Le module de génération de signal de sous-bande est configuré pour générer un signal à envoyer sur au moins une sous-bande en fonction d'au moins un paramètre de configuration de sous-bande, chaque paramètre de configuration de sous-bande comprenant un intervalle de sous-porteuse et une largeur de sous-bande ; le module d'ajout d'intervalle de garde est configuré pour ajouter un intervalle de garde au signal à envoyer sur la ou les sous-bandes, l'intervalle de garde comprenant un préfixe cyclique pour la résistance à l'interférence de chemins multiples et une deuxième fenêtre de temps pour la résistance à l'interférence causée par le filtrage ; le filtre est configuré pour filtrer le signal auquel l'intervalle de garde a été ajouté sur la ou les sous-bandes ; et le module d'émission est configuré pour notifier à un équipement d'utilisateur la longueur du préfixe cyclique pour la résistance à l'interférence de chemins multiples et la longueur de la deuxième fenêtre de temps.
PCT/CN2015/072919 2015-02-12 2015-02-12 Dispositif de communication, système de communication, procédé d'envoi de signal et procédé de réception de signaux Ceased WO2016127367A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113067663A (zh) * 2021-03-23 2021-07-02 海能达通信股份有限公司 一种通信方法、系统及相关设备及存储介质
CN114584174A (zh) * 2022-01-22 2022-06-03 北京睿信丰科技有限公司 基于频域聚焦与合成傅里叶变换的信号捕获方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1885844A (zh) * 2005-06-20 2006-12-27 中国科学院上海微系统与信息技术研究所 基于正交复用多载波传输降低峰均比的装置及其方法
CN101336006A (zh) * 2007-06-26 2008-12-31 上海无线通信研究中心 在传输时隙内多个随机接入信号的时分复用接入方法
US20120082274A1 (en) * 2010-10-01 2012-04-05 Intel Mobile Communications Technology Dresden GmbH Method for processing received ofdm data symbols and ofdm baseband receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1885844A (zh) * 2005-06-20 2006-12-27 中国科学院上海微系统与信息技术研究所 基于正交复用多载波传输降低峰均比的装置及其方法
CN101336006A (zh) * 2007-06-26 2008-12-31 上海无线通信研究中心 在传输时隙内多个随机接入信号的时分复用接入方法
US20120082274A1 (en) * 2010-10-01 2012-04-05 Intel Mobile Communications Technology Dresden GmbH Method for processing received ofdm data symbols and ofdm baseband receiver

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113067663A (zh) * 2021-03-23 2021-07-02 海能达通信股份有限公司 一种通信方法、系统及相关设备及存储介质
CN113067663B (zh) * 2021-03-23 2023-03-10 海能达通信股份有限公司 一种通信方法、系统及相关设备及存储介质
CN114584174A (zh) * 2022-01-22 2022-06-03 北京睿信丰科技有限公司 基于频域聚焦与合成傅里叶变换的信号捕获方法
CN114584174B (zh) * 2022-01-22 2022-12-06 北京睿信丰科技有限公司 基于频域聚焦与合成傅里叶变换的信号捕获方法

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