WO2017158910A1 - Système d'antenne active - Google Patents

Système d'antenne active Download PDF

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Publication number
WO2017158910A1
WO2017158910A1 PCT/JP2016/082388 JP2016082388W WO2017158910A1 WO 2017158910 A1 WO2017158910 A1 WO 2017158910A1 JP 2016082388 W JP2016082388 W JP 2016082388W WO 2017158910 A1 WO2017158910 A1 WO 2017158910A1
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WO
WIPO (PCT)
Prior art keywords
signal
antenna system
signal processing
transmission
antenna elements
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/JP2016/082388
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English (en)
Japanese (ja)
Inventor
修一 西村
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of WO2017158910A1 publication Critical patent/WO2017158910A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/11—Monitoring; Testing of transmitters for calibration
    • H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/15—Performance testing
    • H04B17/16—Test equipment located at the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity

Definitions

  • the present invention relates to an active antenna system.
  • This application claims priority based on Japanese Patent Application No. 2016-055414 filed on Mar. 18, 2016, and incorporates all the content described in the above Japanese application.
  • a radio transmission / reception unit that processes a signal of a radio frequency
  • a baseband signal processing unit that performs processing related to a baseband signal
  • An antenna system installed outdoors is connected to the RRH via a coaxial cable or the like.
  • a radio frequency transmission / reception signal transmitted / received by the antenna system is transmitted between the RRH and the antenna system via a coaxial cable or the like.
  • the RRH and the BBU are connected by an optical fiber cable or the like, and a digital baseband signal is transmitted between the two by optical communication or the like.
  • BBU is installed indoors and RRH is installed directly under the outdoor antenna system.
  • RRH is installed directly under the outdoor antenna system.
  • the RRH is provided with a maintenance port to which a cable for communication with the outside is connected by a connection method compliant with Ethernet (registered trademark), RC232C, or the like (see, for example, Patent Document 1).
  • Ethernet registered trademark
  • RC232C a connection method compliant with Ethernet (registered trademark), RC232C, or the like
  • this port is referred to as an inspection port.
  • the active antenna system includes a plurality of antenna elements, a plurality of signal processing units that process radio signals transmitted by the plurality of antenna elements, and the plurality of antenna elements and the plurality of signal processing units.
  • a plurality of signal extraction units that extract transmission signals output to the corresponding antenna elements from each of the signal processing units, and provided in the case.
  • an inspection port capable of outputting the extracted transmission signal to the outside of the housing.
  • the active antenna system includes a plurality of antenna elements and a plurality of radio transmission / reception units (corresponding to conventional RRHs) provided corresponding to the plurality of antenna elements. For this reason, the radio signal transmitted / received for each antenna element can be controlled, and the controllability is excellent, and it is possible to provide a new service that can improve the communication environment using this excellent controllability.
  • the active antenna system has a structure in which the wireless transmission / reception unit and the antenna element are integrated in the casing. For this reason, as with conventional RRHs, if the quality of the radio signal is confirmed at the output unit of the radio transmission / reception unit, the output unit of the radio transmission / reception unit cannot be easily accessed from the outside of the housing during inspection work. Problems arise.
  • an object of the present invention is to provide an active antenna system that can easily perform inspection work.
  • An active antenna system includes a plurality of antenna elements, a plurality of signal processing units that process radio signals transmitted by the plurality of antenna elements, the plurality of antenna elements, An active antenna system including a plurality of signal processing units, and a plurality of signal extraction units that extract transmission signals output to the corresponding antenna elements from the signal processing units.
  • An inspection port provided in the casing and capable of outputting the extracted transmission signal to the outside of the casing.
  • the inspection port that can output the transmission signal to the antenna element taken out by the signal extraction unit is provided in the housing in which the antenna element and the signal processing unit are accommodated.
  • the signal processing unit can be easily accessed from the outside of the housing. Thereby, the inspection work of an active antenna system can be performed easily.
  • the active antenna system further includes a combiner that combines two or more transmission signals extracted by the signal extraction units different from each other and outputs the combined signals to the inspection port.
  • a combiner that combines two or more transmission signals extracted by the signal extraction units different from each other and outputs the combined signals to the inspection port.
  • the active antenna system further includes a plurality of switches provided on paths connecting the signal extraction units and the combiner, and connecting and disconnecting the paths.
  • the transmission signal extracted from each signal extraction unit can be output to the outside from the inspection port via the combiner. it can.
  • by turning on a predetermined number of switches of 2 or more and turning off the other switches it is possible to synthesize an arbitrary predetermined number of transmission signals by a synthesizer and output it from the inspection port to the outside. .
  • the active antenna system further includes a control unit that individually controls the plurality of switches.
  • the signal output from the inspection port to the outside can be easily changed by individually controlling the plurality of switches by the control unit.
  • FIG. 1 is a block diagram illustrating a part of a base station apparatus including an active antenna system according to the first embodiment of the present invention.
  • the base station apparatus 1 is used as a base station apparatus in a wireless communication system for mobile phones to which LTE (Long Term Evolution) is applied, for example, and is connected to a plurality of mobile terminals (not shown) such as mobile phones and MIMO. (Multiple Input Multiple Output) It has a function of performing wireless communication by transmission.
  • LTE Long Term Evolution
  • MIMO Multiple Input Multiple Output
  • the base station apparatus 1 includes a baseband unit (BBU) 2, a remote radio head (RRH) 3, and an active antenna system 4 (hereinafter also simply referred to as an antenna system 4).
  • the BBU 2 is connected to the RRH 3 via a signal transmission line 5 such as an optical fiber cable, and has a function of transmitting and receiving a frame (CPRI frame) compliant with the CPRI (Common Public Radio Interface) to the RRH 3. ing.
  • the BBU 2 acquires a reception baseband signal (I / Q signal) that is a digital signal from the RRH 3 via the signal transmission path 5.
  • BBU2 has a function which produces
  • the BBU 2 has a function of generating a transmission baseband signal by performing digital modulation processing on transmission data given from an upper network (not shown).
  • the BBU 2 gives a digital transmission baseband signal obtained by modulating transmission data to the RRH 3 via the signal transmission path 5.
  • the RRH 3 is connected to the antenna system 4 by connecting the coaxial cables 6 and 7 extending from the RRH 3 to connection ports 6a and 7a provided in the casing 11 of the antenna system 4, and transmits and receives transmission / reception signals. Signal processing.
  • connection ports 6a and 7a of this embodiment is not shown in FIG. 1, a plurality of (for example, four) connection ports 6a and 7a are provided on the bottom surface 11a of the housing 11, respectively.
  • the same number of coaxial cables 6 and 7 extending from the RRH 3 are respectively connected to 7a.
  • the RRH 3 has a function of converting it into an analog radio frequency signal by performing various signal processing on the transmission baseband signal given from the BBU 2.
  • the RRH 3 supplies the converted analog radio frequency transmission signal to the antenna system 4 via the coaxial cable 6.
  • the RRH 3 has a function of converting a radio frequency reception signal supplied from the antenna system 4 through the coaxial cable 7 into a digital reception signal by performing various signal processing.
  • the RRH 3 gives the converted digital reception signal to the BBU 2.
  • the antenna system 4 is installed higher than the RRH 3 (such as on the roof of a building or on a steel tower).
  • the antenna system 4 includes a plurality of antenna elements 10 housed in a housing 11 for transmitting and receiving radio frequency signals.
  • the antenna system 4 of the present embodiment includes 4 ⁇ N antenna elements 10 (N is an integer equal to or greater than 1), with two antenna elements 10 having polarization directions orthogonal to each other as a set.
  • the antenna system 4 distributes a radio frequency transmission signal provided from the RRH 3 corresponding to each of the plurality of antenna elements 10 and transmits the radio signals from the antenna elements 10 as radio signals.
  • the antenna system 4 synthesizes radio frequency reception signals received by the plurality of antenna elements 10 as radio signals, and gives the synthesized radio frequency signal to the RRH 3.
  • the base station apparatus 1 converts a digital transmission signal into a radio frequency signal and transmits it to the mobile terminal, receives the radio frequency signal transmitted by the mobile terminal, and receives the received signal from the mobile terminal. get.
  • FIG. 2 is a block diagram of the antenna system 4.
  • the antenna system 4 includes the casing 11 and a plurality of antenna elements 10, a plurality of distribution / combiners 12, a plurality of signal processing modules 13, a control unit 14, and a combiner 15.
  • the distribution synthesizers 12 are provided in the casing 11 in the same number as the connection ports 6a (7a). Each distribution synthesizer 12 is connected to a set of connection ports 6 a and 7 a and is connected to a plurality of signal processing modules 13.
  • the plurality of signal processing modules 13 are respectively connected to the antenna elements 10 having the same polarization direction.
  • the antenna system 4 of this embodiment has a 4-branch MIMO function.
  • the distribution synthesizer 12 distributes the radio frequency transmission signal given from the RRH 3 via the connection port 6 a to each of the plurality of signal processing modules 13, and gives the distributed transmission signal to each signal processing module 13.
  • the distribution synthesizer 12 synthesizes reception signals received as radio signals by the plurality of antenna elements 10 and provides the synthesized radio frequency reception signal to the RRH 3 from the connection port 7a.
  • FIG. 3 is a block diagram of the signal processing module 13.
  • the signal processing module 13 includes two duplexers 21 and 22 and a signal processing unit 23.
  • the signal processing unit 23 includes a first phase shifter 27 and a first amplifier 28 in order to process a radio frequency signal (radio signal) transmitted by the antenna element 10 connected to the signal processing module 13.
  • the signal processing unit 23 includes a second phase shifter 29 and a second amplifier 30 in order to process a radio signal received by the antenna element 10 connected to the signal processing module 13.
  • One duplexer 21 is connected to the first phase shifter 27 and the second phase shifter 29 and is also connected to the distribution synthesizer 12 (see FIG. 2).
  • the other duplexer 22 is connected to the first amplifier 28 and the second amplifier 30 and to the antenna element 10 (see FIG. 2).
  • the duplexer 21 provides the first phase shifter 27 with the radio signal (radio frequency transmission signal) input from the distribution synthesizer 12.
  • the first phase shifter 27 adjusts the phase of the transmission signal given from the duplexer 21.
  • the first phase shifter 27 provides the first amplifier 28 with the transmission signal whose phase has been adjusted.
  • the first amplifier 28 amplifies the power of the transmission signal given from the first phase shifter 27 and passes the amplified transmission signal to the duplexer 22 through the signal extraction unit 25.
  • the duplexer 22 outputs the transmission signal given from the first amplifier 28 to the antenna element 10.
  • a radio signal (radio frequency received signal) received by the antenna element 10 is given to the duplexer 22.
  • the duplexer 22 provides the input received signal to the second amplifier 30.
  • the second amplifier 30 amplifies the power of the input reception signal and supplies the second phase shifter 29 with the transmission signal whose power has been amplified.
  • the second phase shifter 29 adjusts the phase of the reception signal supplied from the second amplifier 30 and supplies the reception signal with the adjusted phase to the duplexer 21.
  • the duplexer 21 outputs the received signal given from the second phase shifter 29 to the distribution synthesizer 12.
  • each signal processing module 13 functions as an active antenna that can perform processing such as phase adjustment and power amplification on the transmission / reception signals transmitted and received by the plurality of antenna elements 10 for each antenna element 10. Processing can be performed.
  • the signal processing module 13 further includes a signal extraction unit 25 and a switch 26.
  • the signal extraction unit 25 is composed of, for example, a directional coupler, and is provided between the first amplifier 28 and the duplexer 22.
  • the signal extraction unit 25 extracts a transmission signal output from the signal processing unit 23 toward the antenna element 10. Specifically, the signal extraction unit 25 extracts a transmission signal whose power is amplified by the first amplifier 28 of the signal processing unit 23, and provides the transmission signal to the synthesizer 15 (see FIG. 2).
  • the switch 26 is provided on a path connecting the signal extraction unit 25 and the combiner 15, and connects and disconnects the path.
  • the switch 26 of the present embodiment is composed of, for example, a multi-port high-frequency switch, and has an a contact, a b contact, and a c contact.
  • the switch 26 is controlled by the control unit 14 (see FIG. 2) so as to be in one of an off state in which the a contact is connected to the b contact and an on state in which the a contact is connected to the c contact. Is done.
  • the contact a of the switch 26 is connected to the signal extraction unit 25. Further, for example, a terminator 31 is connected to the b contact of the switch 26, and the c contact of the switch 26 is connected to the synthesizer 15 (see FIG. 2).
  • the control unit 14 turns off the switch 26 (a contact is connected to the b contact) and terminates the signal extraction unit 25. Connected to the device 31.
  • the control unit 14 switches on the switch 26 (a state where the a contact is connected to the c contact).
  • the signal extraction unit 25 is connected to the combiner 15.
  • the control unit 14 is provided in the housing 11 and has a function of individually controlling the switches 26 of the signal processing modules 13.
  • the control unit 14 is connected to a control port 8 a provided on the bottom surface 11 a of the housing 11.
  • the control port 8a is a port compliant with, for example, Ethernet (registered trademark), and is connected to a control cable 8 extending from an external device 50 such as a measuring instrument or a notebook personal computer.
  • Control information for controlling the switch 26 of one or a plurality of signal processing modules 13 is input to the control unit 14 from the external device 50 through the control cable 8 and the control port 8a. Accordingly, the control unit 14 of the present embodiment individually controls the switch 26 of each signal processing module 13 based on the control information input from the external device 50 by connecting the control cable 8 to the control port 8a. It is like that.
  • the synthesizer 15 is provided in the housing 11 and has a function of synthesizing transmission signals extracted by the signal extraction units 25 of two or more different signal processing modules 13. Only one synthesizer 15 according to this embodiment is provided in the casing 11 and synthesizes transmission signals extracted from all the signal processing modules 13.
  • the synthesizer 15 is connected to a single inspection port 9a provided on the bottom surface (outer surface) 11a of the casing 11, and outputs the synthesized transmission signal to the inspection port 9a. Further, when the transmission signal extracted from the single signal processing module 13 is given, the synthesizer 15 outputs the transmission signal as it is to the inspection port 9a.
  • the inspection port 9a is a port compliant with, for example, Ethernet (registered trademark), and is connected to an inspection cable 9 extending from the external device 50 (see FIG. 1).
  • Ethernet registered trademark
  • the inspection port that can output the transmission signal to the antenna element 10 extracted by the signal extraction unit 25 to the outside in the casing 11 in which the antenna element 10 and the signal processing unit 23 are accommodated. Since 9a is provided, the signal processing unit 23 can be easily accessed from the outside of the housing 11 by connecting the inspection cable 9 of the external device 50 to the inspection port 9a. Thereby, the inspection work of the antenna system 4 can be performed easily.
  • a switch 26 for connecting / disconnecting the path is provided on a path connecting each signal extraction unit 25 and the combiner 15. For this reason, by turning on only one of the switches 26 and turning off all the other switches, the transmission signals taken out from the signal take-out sections 25 are sent from the inspection port 9a to the outside via the synthesizer 15. Can be output.
  • FIG. 4 is a block diagram of an antenna system 4 according to the second embodiment of the present invention.
  • the main difference between the antenna system 4 of the present embodiment and the first embodiment is that the synthesizer 15 (see FIG. 2) is not provided.
  • the antenna system 4 of this embodiment includes the same number of inspection ports 9 a as the signal processing module 13. Thereby, the transmission signal taken out from each signal processing module 13 is individually output to the outside from the corresponding inspection port 9a. Since the other structure of this embodiment is the same as that of 1st Embodiment, description is abbreviate
  • each signal processing unit 23 can be easily accessed from the outside of the housing 11. be able to.
  • the switch 26 (see FIG. 3) is provided in the signal processing module 13, but a terminator may be detachably connected to each inspection port 9a instead of the switch 26. In this case, when connecting the inspection cable 9 to the inspection port 9a, it is only necessary to remove the terminator and connect the inspection cable 9.
  • FIG. 5 is a block diagram of an antenna system 4 according to the third embodiment of the present invention.
  • the main difference between the antenna system 4 of the present embodiment and the first embodiment is that a plurality of combiners 15 and a plurality of inspection ports 9a are provided.
  • the antenna system 4 of the present embodiment includes the same number (four) of combiners 15 and inspection ports 9a as the number of MIMO branches.
  • Each synthesizer 15 synthesizes the transmission signals extracted from the signal extraction units 25 of the plurality of signal processing modules 13 constituting one branch.
  • Each combiner 15 is connected to a single inspection port 9a, and outputs the combined transmission signal to the inspection port 9a.
  • Each synthesizer 15 receives the transmission signal extracted from any one of the signal processing modules 13 among the plurality of signal processing modules 13, and the inspection signal 9a corresponding to the transmission signal as it is. Output to. Since the other structure of this embodiment is the same as that of 1st Embodiment, description is abbreviate
  • the antenna system 4 of the present embodiment includes a combiner 15 and an inspection port 9a for each MIMO branch.
  • the combiner 15 and an inspection port are provided for each of two orthogonal polarization directions of the antenna element 10.
  • a port 9a may be provided.
  • a plurality of signal processing modules 13 arranged on the right side and the left side are output to the antenna elements 10 having the same polarization direction. For this reason, the transmission signals extracted from the plurality of signal processing modules 13 on the right side are combined by one synthesizer 15, and the transmission signals extracted from the plurality of signal processing modules 13 on the left side are combined by one other synthesizer 15. You may synthesize.
  • FIG. 6 is a block diagram showing a part of the base station apparatus 1 including the antenna system 4 according to the fourth embodiment of the present invention.
  • the main difference between the antenna system 4 of the present embodiment and the first embodiment is that the upstream end of the control cable 8 is connected to the RRH 3.
  • the control cable 8 extending from the RRH 3 is connected to the control port 8 a of the housing 11.
  • the RRH 3 controls information for controlling the switch 26 of one or a plurality of signal processing modules 13 with respect to the control unit 14 (see FIG. 2) in the housing 11 via the control cable 8 and the control port 8a.
  • the control part 14 of this embodiment controls the switch 26 of each signal processing module 13 with the control information input from RRH3 by connecting the control cable 8 to the control port 8a. Since the other structure of this embodiment is the same as that of 1st Embodiment, description is abbreviate
  • the antenna system 4 according to the fourth embodiment also has the same effects as the first embodiment.
  • FIG. 7 is a block diagram showing a part of the base station apparatus 1 including the active antenna system 4 according to the fifth embodiment of the present invention.
  • the antenna system 4 of the present embodiment is a modification of the fourth embodiment, and is mainly different from the fourth embodiment in that the antenna system 4 and the BBU 2 are directly connected without using the RRH 3. is there.
  • the BBU 2 of the present embodiment is connected to a connection port 17 provided in the housing 11 of the antenna system 4 via a signal transmission path 5 such as an optical fiber cable.
  • the connection port 17 is connected to an interface unit (not shown) for transmitting and receiving a frame conforming to the CPRI in the housing 11.
  • the BBU 2 gives a transmission baseband signal obtained by modulating transmission data given from an upper network (not shown) to the antenna system 4 via the signal transmission path 5. Further, the BBU 2 acquires a reception baseband signal (I / Q signal) that is a digital signal given from the antenna system 4 via the signal transmission path 5, and performs digital demodulation processing on the reception baseband signal. And has a function of generating received data. The BBU 2 gives received data obtained by demodulating the received baseband signal to the upper network.
  • the BBU 2 gives control information for controlling the switches 26 of the one or more signal processing modules 13 to the control unit 14 (see FIG. 2) in the housing 11 via the signal transmission path 5.
  • the control part 14 of this embodiment controls the switch 26 of each signal processing module 13 with the control information input from BBU2. Since the other structure of this embodiment is the same as that of 1st Embodiment, description is abbreviate
  • the antenna system 4 according to the fifth embodiment also has the same effects as the first embodiment.
  • Base station device Baseband unit (BBU) 3 Remote Radio Head (RRH) DESCRIPTION OF SYMBOLS 4 Active antenna system 5 Signal transmission path 6 Coaxial cable 6a Connection port 7 Coaxial cable 7a Connection port 8 Control cable 8a Connection port 9 Inspection cable 9a Inspection port 10 Antenna element 11 Case 11a Bottom surface 12 Divider / Synthesizer 13 Signal processing Module 14 Control unit 15 Synthesizer 17 Connection port 21 Duplexer 22 Duplexer 23 Signal processing unit 25 Signal extraction unit 26 Switch 27 First phase shifter 28 First amplifier 29 Second phase shifter 30 Second amplifier 31 Terminator 50 External device

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un système d'antenne active qui comprend une pluralité d'éléments d'antenne, une pluralité d'unités de traitement de signal qui effectuent un traitement sur des signaux radioélectriques à émettre respectivement par la pluralité d'éléments d'antenne, et un boîtier qui accueille la pluralité d'éléments d'antenne et la pluralité d'unités de traitement de signal. Le système d'antenne active comprend les éléments suivants : une pluralité d'unités d'obtention de signal qui obtiennent, de la part des unités de traitement de signal respectives, les signaux d'émission à délivrer aux éléments d'antenne correspondants ; et un orifice d'inspection qui se trouve dans le boîtier et qui peut délivrer les signaux d'émission obtenus vers l'extérieur du boîtier.
PCT/JP2016/082388 2016-03-18 2016-11-01 Système d'antenne active Ceased WO2017158910A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016055414A JP2017169173A (ja) 2016-03-18 2016-03-18 アクティブアンテナシステム
JP2016-055414 2016-03-18

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WO2017158910A1 true WO2017158910A1 (fr) 2017-09-21

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Publication number Priority date Publication date Assignee Title
WO2019127470A1 (fr) 2017-12-29 2019-07-04 华为技术有限公司 Procédé et appareil de détection de connexion de canal radiofréquence

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010226631A (ja) * 2009-03-25 2010-10-07 Kyocera Corp 通信機器
JP2011254415A (ja) * 2010-06-04 2011-12-15 Sumitomo Electric Ind Ltd 無線装置及び無線基地局装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010226631A (ja) * 2009-03-25 2010-10-07 Kyocera Corp 通信機器
JP2011254415A (ja) * 2010-06-04 2011-12-15 Sumitomo Electric Ind Ltd 無線装置及び無線基地局装置

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