CN103747447B - Radio modem and power TD-LTE private network common antenna system and implementation method thereof - Google Patents
Radio modem and power TD-LTE private network common antenna system and implementation method thereof Download PDFInfo
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Abstract
The invention relates to radio modem and TD-LTE systems in the field of wireless communication, and specifically relates to a radio modem and power TD-LTE private network common antenna system and an implementation method thereof. The system comprises a radio modem base station and a power TD-LTE private network base station. A common combiner is arranged at the output ports of the radio modem base station and the power TD-LTE private network base station. The output of the common combiner is connected with an antenna for realizing a transceiver common antenna of the radio modem base station and the power TD-LTE private network base station. The invention also provides the implementation method of the radio modem and power TD-LTE private network common antenna system. According to the invention, by adding the combiner, radio frequency signals of the radio modem and the power TD-LTE are transmitted through a set of antennas. According to the invention, the existing base station site of the radio modem and an antenna feed system are utilized, the power TD-LTE and radio modem common site common antenna construction can be realized, and the network construction cost can be effectively reduced.
Description
Technical field
The present invention relates to data radio station in wireless communication field with td-lte system and in particular to a kind of data radio station with
The system of electric power td-lte private network shared antenna and its implementation.
Background technology
Wireless communication system shared antenna technology all makes in second filial generation wireless communication system, the third generation wireless communication system
With particularly with using shared antenna technology in multiple wireless communication systems of band operation, this technology is network operation unit
Reduce equipment cost and construction cost.
In electric power wireless private network field, plurality of communication systems shared antenna technology has not been used.Electric power wireless private network has at present
The plurality of communication systems such as data radio station, electric power td-lte private network, two systems are all no entrusted using country and are distributed to power industry and made
230mhz frequency range.
Yuan Jingdian, passes through in " research of many nets unification technique and application in indoor distribution " to increase combiner, device structure is shown
It is intended to as shown in Figure 1 it is achieved that the antenna feeder of the indoor distribution part of the communication system such as wcdma, phs, wlan shares.This technical side
The antenna-feedback system of data radio station is not included shared category by case.This technical scheme is common mainly for the antenna feeder of indoor distribution passage
With not pointing out that outdoor antenna feeder installation shares.
Patent No. zl200510037393.4, invention entitled " a kind of wcdma with frequency range gsm system shared antenna
Realization method and system ", its structural representation is as shown in Fig. 2 pass through to change base station equipment by wcdma base station and gsm base station
Itself, achieve wcdma base station and gsm base station shared antenna, this technical scheme is not by number in the case of not increasing combiner
The antenna-feedback system of platform of conducting electricity includes shared category.
At present shared antenna technology all do not consider data radio station, this increased cost to electric power wireless private network construction.
The present invention is collected the radiofrequency signal of data radio station and electric power td-lte private network to a set of antenna system using combiner, saves
Network construction cost.
Data radio station is applied for many years as a kind of mode of radio communication in power industry, main support electric power load control
Business, still has part data radio station at present in network operation, and no committee of frequency range country used distributes to power industry and used
230mhz frequency range.
With the development of radio communication new technique, power industry introduces td-lte technology, abbreviation electric power td-lte private network, master
Support the power businesses such as power information collection, on-line monitoring and distribution automation, frequency range used is no entrusted for country and distributed to
The 230mhz frequency range that power industry is used.In the electric power td-lte dedicated network process of construction based on 230mhz frequency range, need
Base station selection to be carried out and antenna feeder building-up work, and in the existing base station site of the 230mhz electric power data radio station network running and sky
Feedback system.All can increase input again by addressing and construction antenna-feedback system for electric power td-lte, is unfavorable for networking.
Content of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of data radio station and electric power td-lte private network sky altogether
The system of line and its implementation, the present invention passes through to increase combiner, and the radiofrequency signal of data radio station and electric power td-lte is led to
Cross a set of antenna to launch.The present invention utilizes the existing base station site of data radio station and antenna-feedback system, realize electric power td-lte with
The colocation site shared antenna of data radio station is built, and is effectively saved network construction cost.
The purpose of the present invention is to be realized using following technical proposals:
The present invention provides the system of a kind of data radio station and electric power td-lte private network shared antenna, and it thes improvement is that, institute
The system of stating includes data radio station base station and electric power td-lte private network base station, described data radio station base station and electric power td-lte private network base
Equipped at outlet port of standing is provided with shared combiner, and the delivery outlet of described shared combiner connects antenna, is used for realizing data radio station base station
Duplexer with electric power td-lte private network base station.
Further, described data radio station base station include exciter units, power amplifier, Base Band Unit, receiving unit,
Control unit and duplexer；Described exciter units, power amplifier, duplexer, receiving unit and Base Band Unit are sequentially connected
Form closed-loop path；Described control unit is connected with exciter units and receiving unit respectively；
Described exciter units are used for completing the modulation of radiofrequency signal；
The radiofrequency signal that described power amplifier is used for producing exciter units carries out power amplification, is then fed to double
Work device, is launched by antenna；
Described Base Band Unit is responsible for realizing Signal coding, analog digital conversion, and data terminal and is carried out data exchange；
Described receiving unit is responsible for the process of the demodulation audio signal of radiofrequency signal；Receiving unit is by penetrating that antenna receives
Deliver to Base Band Unit after frequency demodulated signal to process；
Described control unit is used for being responsible for the control of the machine working condition, including operating frequency, panel display and communication
The control of state；The isolation of transmission signal and receipt signal is responsible for by duplexer, carries out while ensureing transmitting and receive.
Further, described electric power td-lte private network base station includes connecting radio frequency remoto module rru and base band by optical fiber
Processing unit bbu；Single baseband processing unit bbu supports at least one radio frequency remoto module rru；Described baseband processing unit
Bbu is responsible for the process of baseband signal；Radio frequency remoto module rru is responsible for the conversion between baseband signal and analog radio-frequency signal；
Wave filter that described radio frequency remoto module rru includes being sequentially connected, power amplifier, transceiver, analog digital conversion
Device and digital processing unit.
Further, frequency range used by described data radio station base station is 230mhz frequency range, used by electric power td-lte private network base station
Frequency range is 230mhz frequency range；Described common antenna is included in antenna-feedback system, and described antenna-feedback system includes antenna, feeder line and coupling
Device, described antenna is responsible for launching and is received radio wave, and described feeder line is used for being responsible for the transmission wireless signal that receives of antenna extremely
Bonder, described bonder is responsible for for the two-way radiofrequency signal of data radio station and electric power td-lte private network synthesizing one in down direction
Road, is responsible for for a road mixed signal of data radio station base station and electric power td-lte private network base station being divided into two branch roads in up direction
Signal.
The present invention also provides the implementation method of a kind of data radio station and electric power td-lte private network communal-antenna system, and it improves it
Place is, described implementation method includes following processing modes:
(1) electric power td-lte private network is descending, comprising: network in the baseband processing unit bbu reception of electric power td-lte private network
The data of unit, completes to transmit a signal to radio frequency remoto module rru after baseband coding is processed in baseband processing unit bbu；Radio frequency
Digital processing unit in far-pulling module rru completes the digital intermediate frequency modulation treatment of signal, and by the digital medium-frequency signal after processing
Transmit to analog-digital converter；Analog-digital converter completes digital medium-frequency signal to the conversion of analog if signal, and by after conversion
Analog if signal transmits to transceiver；Transceiver completes analog if signal to the conversion of analog radio-frequency signal, and will
Analog radio-frequency signal after conversion transmits to power amplifier；Power amplifier completes to carry out low power analog radio-frequency signal
Power amplification, and the analog radio-frequency signal after power amplification is transmitted to wave filter；Before wave filter completes emission of radio frequency signals
Bandpass filtering, and by filtered signal transmission to shared antenna combiner；Electric power td-lte radio frequency is believed by common antenna combiner
Number and data radio station radiofrequency signal combining after transmit to antenna, launched by antenna；
(2) electric power td-lte private network base station is up, comprising: antenna is by the radio signal transmission receiving to shared antenna combining
Device；A road radiofrequency signal from antenna is divided into two-way radiofrequency signal by shared antenna combiner, and wherein one tunnel is transmitted to electric power td-
Wave filter in the radio frequency remoto module rru of lte private network base station；Wave filter completes the filter of electric power td-lte analog radio-frequency signal
Ripple, and by filtered signal transmission to power amplifier；Power amplifier completes to carry out low power analog radio-frequency signal
Power amplification, and the analog radio-frequency signal after power amplification is transmitted to transceiver；Transceiver completes analog radio-frequency signal
To the conversion of analog if signal, and the analog if signal after conversion is transmitted to analog-digital converter；Analog-digital converter completes
Analog if signal to digital medium-frequency signal conversion, and by conversion after digital medium-frequency signal transmit to digital processing unit；Number
The demodulation that word processing device completes digital medium-frequency signal is processed, and by the signal transmission after demodulation to electric power td-lte private network base station
Baseband processing unit bbu；Baseband processing unit bbu completes baseband decoding and processes, and by the data transfer after processing to the first line of a couplet
Network element；
(3) data radio station base station down, comprising: data radio station base station Base Band Unit receive first line of a couplet network element data,
Base Band Unit is responsible for realizing Signal coding, analog digital conversion, and transmits a signal to exciter units；Exciter units are responsible for completing
The modulation of analog radio-frequency signal, and transmit a signal to power amplifier；Power amplifier completes the power of analog radio-frequency signal
Amplify, and analog radio-frequency signal is transmitted to duplexer；Duplexer completes the filtering of analog radio-frequency signal, and transmits a signal to
Shared antenna combiner；Shared antenna combiner is by after electric power td-lte private network base station radio-frequency signal and data radio station radiofrequency signal combining
Transmit to antenna, launched by antenna；
(4) data radio station base station is up, comprising: antenna is by the radio signal transmission receiving to shared antenna combiner；Altogether
A road radiofrequency signal from antenna is divided into two-way radiofrequency signal by antenna combiner, and wherein one tunnel is transmitted to data radio station base station
Duplexer；Duplexer completes the filtering of analog radio-frequency signal, and transmits a signal to receiving unit；Receiving unit completes to simulate
The demodulation of radiofrequency signal, and transmit a signal to Base Band Unit；Base Band Unit is responsible for realizing the analog digital conversion of signal and decoding, and
Send data to first line of a couplet network element.
Compared with the prior art, the beneficial effect that the present invention reaches is:
1st, the present invention has shared data radio station and the antenna system of electric power td-lte private network, reduces equipment cost and construction
Cost.
2 by the present invention in that can conveniently control data radio station with equipment such as rational common antenna combiner, wave filter
With the inter-system interference of electric power td-lte private network, increase the network performance of data radio station and electric power td-lte private network.
Brief description
Fig. 1 is the structural representation of many nets unification technique in indoor distribution of the prior art；
Fig. 2 is wcdma and the structural representation with frequency range gsm system shared antenna in prior art；
Fig. 3 is the structural representation with the system of td-lte private network shared antenna for the data radio station of present invention offer.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in further detail.
The data radio station of present invention offer and the structural representation of the system of td-lte private network shared antenna are as shown in figure 3, be
System includes data radio station base station and electric power td-lte private network base station, and described data radio station base station and electric power td-lte private network base station are defeated
Exit is provided with combiner, and the delivery outlet of described combiner connects antenna, is used for realizing data radio station base station and electric power td-lte
The transmitting-receiving shared antenna of private network base station.
Data radio station base station includes exciter units, power amplifier, Base Band Unit, receiving unit, control unit and double
Work device；Described exciter units, power amplifier, duplexer, receiving unit and Base Band Unit are in turn connected to form closed-loop path；
Described control unit is connected with exciter units and receiving unit respectively.Exciter units are responsible for completing the modulation of radiofrequency signal.
The radiofrequency signal that power amplifier is responsible for producing exciter units carries out power amplification, is then fed to duplexer, by antenna
Launch.Base Band Unit is responsible for realizing Signal coding, analog digital conversion, and data terminal and is carried out data exchange.Receiving unit is born
The process of the demodulation audio signal of duty radiofrequency signal.Base band list is delivered to after the radiofrequency signal demodulation that antenna is received by receiving unit
Unit is processed.Control unit is responsible for the control of the machine working condition, including operating frequency, panel display, communications status control
Deng.The isolation of transmission signal and receipt signal is responsible for by duplexer, carries out while ensureing transmitting and receive.
Frequency range used by electric power td-lte private network is 230mhz frequency range, and electric power td-lte private network base station includes optical fiber and connects radio frequency
Far-pulling module rru and baseband processing unit bbu, described radio frequency remoto module rru includes wave filter, the power amplification being sequentially connected
Device, transceiver, analog-digital converter, digital processing unit；Single baseband processing unit bbu supports at least one radio frequency remoto module
rru；Described baseband processing unit bbu is responsible for the process of baseband signal, and radio frequency remoto module rru is responsible for baseband signal and is penetrated with simulation
Conversion between frequency signal；
Antenna is included in antenna-feedback system, and described antenna-feedback system includes antenna, feeder line and bonder, antenna be responsible for transmitting and
Receive radio wave, feeder line is responsible for transmitting the wireless signal that receives of antenna to bonder, bonder down direction be responsible for by
The two-way radiofrequency signal of data radio station and electric power td-lte private network synthesizes a road, is responsible for data radio station and electric power in up direction
One tunnel mixed signal of td-lte private network is divided into two tributary signals.
The present invention also provides a kind of implementation method of the system of data radio station and electric power td-lte private network shared antenna, including with
Lower processing mode:
(1) electric power td-lte private network base station down, comprising: electric power td-lte private network baseband processing unit bbu receives the first line of a couplet
The data of network element, completes to transmit a signal to radio frequency remoto module rru after baseband coding is processed in baseband processing unit bbu；Penetrate
Digital processing unit in frequency far-pulling module rru completes the digital intermediate frequency modulation treatment of signal, and the digital intermediate frequency letter after processing
Number transmit to analog-digital converter；Analog-digital converter completes digital medium-frequency signal to the conversion of analog if signal, and after changing
Analog if signal transmit to transceiver；Transceiver completes analog if signal to the conversion of analog radio-frequency signal, and
Analog radio-frequency signal after conversion is transmitted to power amplifier；Power amplifier completes to enter low power analog radio-frequency signal
Row power amplification, and the analog radio-frequency signal after power amplification is transmitted to wave filter；Before wave filter completes emission of radio frequency signals
Bandpass filtering, and by filtered signal transmission to shared antenna combiner；Electric power td-lte radio frequency is believed by shared antenna combiner
Number and data radio station radiofrequency signal combining after transmit to antenna, launched by antenna.
(2) electric power td-lte private network base station is up, comprising: antenna is by the radio signal transmission receiving to shared antenna combining
Device；A road radiofrequency signal from antenna is divided into two-way radiofrequency signal by shared antenna combiner, and wherein one tunnel is transmitted to electric power td-
Wave filter in lte radio frequency remoto module rru；Wave filter completes the filtering of electric power td-lte analog radio-frequency signal, and will filter
Signal transmission afterwards is to power amplifier；Power amplifier completes for low power analog radio-frequency signal to carry out power amplification, and
Analog radio-frequency signal after power amplification is transmitted to transceiver；Transceiver completes analog radio-frequency signal to be believed to analog intermediate frequency
Number conversion, and by conversion after analog if signal transmit to analog-digital converter；Analog-digital converter completes analog if signal
To the conversion of digital medium-frequency signal, and the digital medium-frequency signal after conversion is transmitted to digital processing unit；Digital processing unit completes
The demodulation of digital medium-frequency signal is processed, and by the signal transmission after demodulation to electric power td-lte private network baseband processing unit bbu；
Baseband processing unit bbu completes baseband decoding etc. and processes, and will be first for supreme for the data transfer after processing networking.
(3) data radio station base station down, comprising: the Base Band Unit of data radio station base station receives the data of first line of a couplet network element, base
Tape cell is responsible for realizing Signal coding, analog digital conversion, and transmits a signal to exciter units；Exciter units are responsible for completing mould
Intend the modulation of radiofrequency signal, and transmit a signal to power amplifier；The power that power amplifier completes analog radio-frequency signal is put
Greatly, and by analog radio-frequency signal transmit to duplexer；Duplexer completes the filtering of analog radio-frequency signal, and transmits a signal to altogether
Antenna combiner；Shared antenna combiner transmits after electric power td-lte radiofrequency signal and data radio station radiofrequency signal combining to sky
Line, is launched by antenna.
(4) data radio station base station is up, comprising: antenna is by the radio signal transmission receiving to shared antenna combiner；Altogether
A road radiofrequency signal from antenna is divided into two-way radiofrequency signal by antenna combiner, and wherein one tunnel is transmitted to data radio station duplex
Device；Duplexer completes the filtering of analog radio-frequency signal, and transmits a signal to receiving unit；Receiving unit completes analog radio frequency letter
Number demodulation, and transmit a signal to Base Band Unit；Base Band Unit is responsible for realizing the analog digital conversion of signal and decoding, and by data
Transmission supreme networking unit.
Finally it should be noted that: above example is only not intended to limit in order to technical scheme to be described, to the greatest extent
Pipe has been described in detail to the present invention with reference to above-described embodiment, and those of ordinary skill in the art are it is understood that still
The specific embodiment of the present invention can be modified or equivalent, and any without departing from spirit and scope of the invention
Modification or equivalent, it all should be covered in the middle of scope of the presently claimed invention.
Claims (4)
1. a kind of data radio station and the system of electric power td-lte private network shared antenna are it is characterised in that described system includes several conducting electricity
Stylobate station and electric power td-lte private network base station, described data radio station base station and electric power td-lte private network base station equipped at outlet port are provided with altogether
With combiner, the delivery outlet connection antenna of described shared combiner, it is used for realizing data radio station base station and electric power td-lte private network
The duplexer of base station；
Frequency range used by described data radio station base station is 230mhz frequency range, and frequency range used by electric power td-lte private network base station is 230mhz frequency
Section；Described common antenna is included in antenna-feedback system, and described antenna-feedback system includes antenna, feeder line and bonder, and described antenna is born
Duty transmitting and receive radio wave, described feeder line is used for being responsible for the transmission wireless signal that receives of antenna to bonder, described coupling
Clutch is responsible for for the two-way radiofrequency signal of data radio station and electric power td-lte private network synthesizing a road in down direction, in up direction
It is responsible for for a road mixed signal of data radio station base station and electric power td-lte private network base station being divided into two tributary signals.
2. the system as claimed in claim 1 is it is characterised in that described data radio station base station includes exciter units, power is put
Big device, Base Band Unit, receiving unit, control unit and duplexer；Described exciter units, power amplifier, duplexer, reception
Unit and Base Band Unit are in turn connected to form closed-loop path；Described control unit is connected with exciter units and receiving unit respectively
Connect；
Described exciter units are used for completing the modulation of radiofrequency signal；
The radiofrequency signal that described power amplifier is used for producing exciter units carries out power amplification, is then fed to duplex
Device, is launched by antenna；
Described Base Band Unit is responsible for realizing Signal coding, analog digital conversion, and data terminal and is carried out data exchange；
Described receiving unit is responsible for the process of the demodulation audio signal of radiofrequency signal；The radio frequency that antenna receives is believed by receiving unit
Number demodulation after deliver to Base Band Unit process；
Described control unit is used for being responsible for the control of the machine working condition, including operating frequency, panel display and communications status
Control；The isolation of transmission signal and receipt signal is responsible for by duplexer, carries out while ensureing transmitting and receive.
3. the system as claimed in claim 1 is it is characterised in that described electric power td-lte private network base station includes connecting by optical fiber
Radio frequency remoto module rru and baseband processing unit bbu；Single baseband processing unit bbu supports at least one radio frequency remoto module
rru；Described baseband processing unit bbu is responsible for the process of baseband signal；Radio frequency remoto module rru is responsible for baseband signal and is penetrated with simulation
Conversion between frequency signal；
Wave filter that described radio frequency remoto module rru includes being sequentially connected, power amplifier, transceiver, analog-digital converter and
Digital processing unit.
4. the implementation method of a kind of data radio station and electric power td-lte private network communal-antenna system is it is characterised in that described realization side
Method includes following processing modes:
(1) electric power td-lte private network is descending, comprising: the baseband processing unit bbu of electric power td-lte private network receives first line of a couplet network element
Data, completes to transmit a signal to radio frequency remoto module rru after baseband coding is processed in baseband processing unit bbu；Remote radio
Digital processing unit in module rru completes the digital intermediate frequency modulation treatment of signal, and the digital medium-frequency signal transmission after processing
To analog-digital converter；Analog-digital converter completes digital medium-frequency signal to the conversion of analog if signal, and by the simulation after conversion
Intermediate-freuqncy signal is transmitted to transceiver；Transceiver completes analog if signal to the conversion of analog radio-frequency signal, and will change
Analog radio-frequency signal afterwards transmits to power amplifier；Power amplifier completes for low power analog radio-frequency signal to carry out power
Amplify, and the analog radio-frequency signal after power amplification is transmitted to wave filter；Wave filter completes the band logical before emission of radio frequency signals
Filtering, and by filtered signal transmission to shared antenna combiner；Common antenna combiner by electric power td-lte radiofrequency signal and
Transmit to antenna after data radio station radiofrequency signal combining, launched by antenna；
(2) electric power td-lte private network base station is up, comprising: antenna is by the radio signal transmission receiving to shared antenna combiner；
A road radiofrequency signal from antenna is divided into two-way radiofrequency signal by shared antenna combiner, and wherein one tunnel is transmitted to electric power td-lte
Wave filter in the radio frequency remoto module rru of private network base station；Wave filter completes the filtering of electric power td-lte analog radio-frequency signal, and
By filtered signal transmission to power amplifier；Power amplifier completes for low power analog radio-frequency signal to carry out power to put
Greatly, and by the analog radio-frequency signal after power amplification transmit to transceiver；Transceiver completes analog radio-frequency signal to simulation
The conversion of intermediate-freuqncy signal, and the analog if signal after conversion is transmitted to analog-digital converter；Analog-digital converter completes in simulation
Frequency signal to digital medium-frequency signal conversion, and by conversion after digital medium-frequency signal transmit to digital processing unit；Digital processing
The demodulation that device completes digital medium-frequency signal is processed, and the base band by the signal transmission after demodulation to electric power td-lte private network base station
Processing unit bbu；Baseband processing unit bbu completes baseband decoding and processes, and will be first for supreme for the data transfer after processing networking；
(3) data radio station base station down, comprising: data radio station base station Base Band Unit receive first line of a couplet network element data, base band
Unit is responsible for realizing Signal coding, analog digital conversion, and transmits a signal to exciter units；Exciter units are responsible for completing to simulate
The modulation of radiofrequency signal, and transmit a signal to power amplifier；Power amplifier completes the power amplification of analog radio-frequency signal,
And transmit analog radio-frequency signal to duplexer；Duplexer completes the filtering of analog radio-frequency signal, and transmits a signal to common sky
Line combiner；Shared antenna combiner will transmit after electric power td-lte private network base station radio-frequency signal and data radio station radiofrequency signal combining
To antenna, launched by antenna；
(4) data radio station base station is up, comprising: antenna is by the radio signal transmission receiving to shared antenna combiner；Shared antenna
A road radiofrequency signal from antenna is divided into two-way radiofrequency signal by combiner, and wherein one tunnel is transmitted double to data radio station base station
Work device；Duplexer completes the filtering of analog radio-frequency signal, and transmits a signal to receiving unit；Receiving unit completes analog radio frequency
The demodulation of signal, and transmit a signal to Base Band Unit；Base Band Unit is responsible for realizing the analog digital conversion of signal and decoding, and by number
According to transmitting, supreme networking is first.
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| CN201310641902.9A CN103747447B (en) | 2013-12-03 | 2013-12-03 | Radio modem and power TD-LTE private network common antenna system and implementation method thereof |
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| CN201310641902.9A CN103747447B (en) | 2013-12-03 | 2013-12-03 | Radio modem and power TD-LTE private network common antenna system and implementation method thereof |
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| CN103747447B true CN103747447B (en) | 2017-01-25 |
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| CN105071827A (en) * | 2015-08-27 | 2015-11-18 | 成都众山科技有限公司 | Full-duplex data transfer radio |
| CN105208686B (en) * | 2015-10-15 | 2019-01-25 | 南京新联电子股份有限公司 | It polymerize multi-carrier-wave wireless wide band radio-frequency processing unit based on the discrete frequency point of 230MHz |
| CN105306764B (en) * | 2015-11-09 | 2018-01-30 | 中国电子科技集团公司第五十四研究所 | A kind of shortwave modem |
| CN105450188B (en) * | 2015-12-21 | 2019-07-16 | 武汉中元通信股份有限公司 | A kind of double power amplification combiners suitable for double-channel frequency hopping radio set |
| CN106936463B (en) * | 2015-12-30 | 2020-04-24 | 中兴通讯股份有限公司 | Duplex filtering device, RRU system and radio frequency system |
| CN106130621A (en) * | 2016-06-22 | 2016-11-16 | 贵州电网有限责任公司贵阳供电局 | A kind of 230MHz antenna transmission system and base station and control method thereof |
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