CN201523385U - Fiber optic repeater compatible with homogeneous frequency mode and heterogeneous frequency mode - Google Patents
Fiber optic repeater compatible with homogeneous frequency mode and heterogeneous frequency mode Download PDFInfo
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- CN201523385U CN201523385U CN2009202216683U CN200920221668U CN201523385U CN 201523385 U CN201523385 U CN 201523385U CN 2009202216683 U CN2009202216683 U CN 2009202216683U CN 200920221668 U CN200920221668 U CN 200920221668U CN 201523385 U CN201523385 U CN 201523385U
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Abstract
The utility model relates to a fiber optic repeater compatible with the homogeneous frequency mode and heterogeneous frequency mode, which comprises a repeater local machine and a repeat remote machine connected through an optical fiber, wherein, the repeater local machine comprises a duplexer and an uplink low noise amplifier connected with an optical module, the repeater remote machine comprises a duplexer as well as an optical module, a downlink power amplifier and a duplexer connected in sequence with the uplink low noise amplifier, the fiber optic repeater further comprises a radio frequency switch unit, a radio frequency switch unit and a directional coupler, one end of the directional coupler is connected with the uplink low noise amplifier of the repeater local machine, the other end there of is connected with the radio frequency switch unit, the radio frequency switch unit is connected respectively with the duplexers and the optical modules, and the radio frequency switch unit is connected respectively with the two duplexers of the repeater remote machine and the uplink low noise amplifier. The repeater has the advantages of high level of isolation, small insertion loss, optimized output power, high switching reliability, low additional noise factor, and high response speed.
Description
Technical field
The utility model relates to the optical fiber repeater of same, the alien frequencies pattern compatibility that is used for Railroad Communication System.
Background technology
China is the country on many mountains, and geographical situation is very complicated, and numerous mountain areas, hills and tunnel are distributing on the railway line.Chinese Railway development in recent years is rapid, and the railway communication feeble field district and the blind area of being caused because of the tunnel, mountain area also constantly increase thereupon.And except the tunnel, mountain area, the economic constantly prosperity that railway is along the line, the high buildings and large mansions that the railway both sides emerge have also become the artificial barrier of signal of communication.Be accompanied by railway and raise speed one after another, railway transporting operation busy day by day covers network signal and to have higher requirement again.Railway overlay model along the line is covered as main with chain, communication equipment distributes along the line along railway.Optical fiber repeater is a transmission medium with optical fiber, utilizes the low loss characteristic of Optical Fiber Transmission, is very suitable for railway long range signals along the line and covers.Advantage such as optical fiber repeater has that repeater span is far away, signal quality is high, good operation stability, convenient engineering installation, Operation and Maintenance are simple is particularly suitable for solving railway feeble field district covering problem.But traditional optical fiber repeater can only carry out the amplification of alien frequencies signal on operation principle, can not realize the B standard and the C multiple display modes compatible of railway communication, has limited optical fiber direct amplification and has stood in the scope of application in the railway communication.
Summary of the invention
Deficiency in view of the prior art existence, it is a kind of under the situation that does not change original Wireless Telecom Equipment and communication mode that the utility model provides, the signal that extends the radio station covers, and eliminates communication blind district, realizes that equipment that signal feeble field district covers is promptly with the optical fiber repeater of, alien frequencies pattern compatibility.
The utility model for achieving the above object, the technical scheme that is adopted is: a kind of same, the optical fiber repeater of alien frequencies pattern compatibility, comprise the repeater near-end machine that is connected by optical fiber, the repeater remote termination, described repeater near-end machine comprises duplexer and the up low noise amplifier that is connected with optical module, described repeater remote termination comprises duplexer and the optical module that links to each other successively with up low noise amplifier, downlink power amplifier, duplexer, it is characterized in that: also comprise the radio-frequency (RF) switch unit, the radio-frequency (RF) switch unit, directional coupler, described directional coupler one end links to each other with the up low noise amplifier of repeater near-end machine, the other end is connected with the radio-frequency (RF) switch unit, the radio-frequency (RF) switch unit respectively with duplexer, optical module connects; Described radio-frequency (RF) switch unit is connected with two duplexers of repeater remote termination, up low noise amplifier respectively.
The beneficial effects of the utility model are: same, the compatible repeater of alien frequencies mainly relies on inner radio-frequency (RF) switch unit, in communication process, need the frequency of radio-frequency (RF) switch action little, most of communications status radio-frequency (RF) switch unit need not action, make communication process smooth more, strengthened system reliability.
1, system's isolation height: same, the compatible repeater of alien frequencies schemes synthesis has been considered system's isolation, prevents that the situation of equipment self-excitation in the communication process from producing.Wherein inside, near-end radio-frequency (RF) switch unit is formed by the cascade of two-stage electronic switch, and uplink and downlink Signal Spacing degree is greater than 90dB.And near-end radio-frequency (RF) switch cell isolation degree is greater than 60dB, and comprehensive complete machine uplink and downlink Signal Spacing degree is greater than 150dB.And system descending gain 40dB (calculate the repeater of pressing power 10W); The system uplink gain also is 40dB.Comprehensive complete machine uplink and downlink gain is 80dB altogether.With isolation in, the compatible repeater of the alien frequencies scheme far above system gain, the equipment self-excitation in can avoiding using.
2, insert loss little, optimize power output: since in the past in the scheme radio-frequency (RF) switch be positioned over the repeater remote termination, radio-frequency (RF) switch need be born high-power, considers system's isolation again, so the insertion loss ratio of radio-frequency (RF) switch is bigger.After the amplification of downstream signal via descending power amplifier module, can lose more power, reduce the operating efficiency of equipment at the radio-frequency (RF) switch place.The far end radio frequency switch element adopts high-performance radio-frequency switch component, and it is big that radio-frequency (RF) switch is born power, and it is little that module is inserted loss, and is promptly little to the downstream signal influence, can not influence the complete machine down output power.Under equal conditions, increase the operating efficiency of equipment, enlarged the coverage of system.
3, switch reliability height: with, the compatible repeater of alien frequencies scheme utilization high-performance radio-frequency switch component, it is long that the switch number of times reaches millions of times, life-span, the reliability height.In regular maintenance, the mechanical type radio-frequency (RF) switch needs frequent maintenance and replacing as the rapid wear device.Radio-frequency (RF) switch just will cause communication not smooth as with the Primary Component in, the compatible repeater of the alien frequencies scheme in case damage, and influence the normal operation of row adjusting system.
4, the additional noise coefficient is little: a considerable advantage of optical fiber repeater is that noise factor is little, and the noise factor index directly influences the cascade number of repeater remote termination.And the wire covering along the line of Railroad Communication System requirement railway, especially require a plurality of remote termination cascades to extend the overlay area at the long tunnel place, therefore reduce noise factor and in the optical fiber repeater system, be very important.Same, the compatible repeater of alien frequencies scheme is selected the little radio-frequency switch circuit of noise factor for use, and other additional devices all adopt passive radio frequency device, and increase system noise that can be few as far as possible improves the coverage of system and the communication quality of enhanced system.
5, response speed is fast: same, the compatible repeater of alien frequencies scheme has high response speed.Be the microsecond level operate time of single electronics radio-frequency (RF) switch, and the radio frequency detecting unit is a Millisecond to the amplitude time decision of signal.Total response time of radio-frequency (RF) switch is a Millisecond, and hiatus not in the communication process is to not influence of communication process.
Description of drawings
Fig. 1 is the utility model system block diagram and as Figure of abstract.
Fig. 2 is the utility model near-end machine radio-frequency (RF) switch unit block diagram.
Fig. 3 is the utility model remote termination radio-frequency (RF) switch unit block diagram.
Fig. 4 is the utility model near-end machine radio-frequency (RF) switch element circuit schematic diagram.
Fig. 5 is the utility model remote termination radio-frequency (RF) switch element circuit schematic diagram.
Embodiment
As Fig. 1,2,3,4, shown in 5, with, the optical fiber repeater of alien frequencies pattern compatibility, comprise the repeater near-end machine 1 (HY-4154 type) that is connected by optical fiber, repeater remote termination 2 (HY-4155 type), repeater near-end machine 1 comprises duplexer 1-1 and the up low noise amplifier 1-3 that is connected with optical module 1-2, repeater remote termination 2 comprises duplexer 2-1 and the optical module 2-4 that links to each other successively with up low noise amplifier 2-5, downlink power amplifier 2-3, duplexer 2-2, it is characterized in that: also comprise radio-frequency (RF) switch unit 1-4, radio-frequency (RF) switch unit 2-6, directional coupler 1-5, described directional coupler 1-5 one end links to each other with the up low noise amplifier 1-3 of repeater near-end machine 1, the other end is connected with radio-frequency (RF) switch unit 1-4, radio-frequency (RF) switch unit 1-4 respectively with duplexer 1-1, optical module 1-2 connects; Described radio-frequency (RF) switch unit 2-6 is connected with the duplexer 2-1 duplexer 2-2 of repeater remote termination, up low noise amplifier 2-5 respectively.Radio-frequency (RF) switch unit 1-4 comprises radio-frequency (RF) switch chip 1-41, radio-frequency (RF) switch chip 1-42, control circuit, the power-sensing circuit that links to each other with power supply, described power-sensing circuit is connected with control circuit, control circuit is connected with radio-frequency (RF) switch chip 1-42, radio-frequency (RF) switch chip 1-41 respectively, and the F pin of radio-frequency (RF) switch chip 1-42 connects the descending 468MHz signal of RF1, E pin, and to meet RF4 be the descending 468MH of descending 458MHZ/
ZOutput signal, D pin link to each other with the C pin of radio-frequency (RF) switch chip 1-41, and radio-frequency (RF) switch chip 1-41A pin meets the descending 458MH of RF2
2It is up 458MH that signal, B pin meet RF3
ZOutput signal.Radio-frequency (RF) switch unit 2-6, comprise radio-frequency relay (2-61), power circuit, power-sensing circuit, control circuit, described power circuit is connected with radio-frequency relay 2-61, power-sensing circuit, control circuit respectively, described power-sensing circuit is connected with radio-frequency relay 2-61 by control circuit, and radio-frequency relay 2-61C pin meets the descending 458MH of RF1
ZSignal, B pin meet the up 458MH of RF2
ZIt is up 458MH that signal, A pin meet RF3
Z/ descending 458MH
ZOutput signal.
Same, alien frequencies compatible type optical fiber repeater near-end machine mainly comprise compositions such as directional coupler, webmaster access device.Together, the alien frequencies compatible type near-end machine and the common near-end machine main distinction are the radio frequency unit that it is inner.Together, alien frequencies compatible type near-end machine has increased radio-frequency (RF) switch unit 1-4 and directional coupler 1-5.Other parts are then consistent with common alien frequencies repeater near-end machine.Wherein radio-frequency (RF) switch unit 1-4 also is the small-signal radio-frequency (RF) switch, and the built-in signal detector is judged with frequency or alien frequencies signal, automatic switching signal passage.Have that response speed is fast, switch reliability height, insert the little characteristics of loss, realized with, alien frequencies dual-mode compatibility.Also used directional coupler in the near-end machine, the running number information that can directly export in the Railroad Communication System is given running number Rcv decoder equipment, has saved the antenna of running number Rcv decoder equipment.
The compatible type remote termination and the common remote termination main distinction also are the radio frequency unit that it is inner.The compatible type remote termination has increased radio-frequency (RF) switch unit 2-6.Radio-frequency (RF) switch unit 2-6 also becomes the large-signal radio-frequency (RF) switch, realizes the up/descending switching to the 458MHz signal, and maximum can be born the large-signal of 43dBm, and have insert loss little, up/characteristics that descending isolation is high.
1, the radio-frequency (RF) switch unit 1-4 circuit theory of near-end machine: during the device standby state, radio-frequency (RF) switch chip 1-41 (model: SKY13286) be in the AB connected state, radio-frequency (RF) switch chip 1-42 (model: SKY13286) be in the EF connected state.
Radiofrequency signal enters this modular unit from RF1 port or the RF2 port of Fig. 4 earlier, coupling is given RF power sensing circuit (model: AD8362) with signal through microstrip line power, power-sensing circuit is according to magnitude of voltage Vout of the corresponding output of different input radio frequency power, then this magnitude of voltage Vout is inputed to operational amplifier LM2904, LM2904 compares the size of Vout and reference voltage V 1+.
When Vout＞V1+, LM2904 control switch chip 1 switches to the AC connected state, and control switch chip 2 switches to the ED connected state.
When Vout＜V1+, LM2904 control switch chip 1 switches to the AB connected state, and control switch chip 2 switches to the EF connected state.
In the time of (0.1-2.0GHz), SKY13286 chip Specifeca tion speeification is: isolation (Isolation): 64dB; Insert loss (Insertion loss): 0.8dB; 1dB compression point input power (Input power for 1dB compression): 23dBm; Control voltage (Control voltages): 0.5～2.7V; Response time (TRISE)=3ns, have isolation height, response rapidly, insert loss little, bear high-power characteristics.
The radio-frequency power detection chip adopts the AD8362 chip of U.S. ADI company.AD8362 chip Specifeca tion speeification is:
Input dynamic range (Input dynamic range) :-52dBm～+ 8dBm in 50 Ω; Frequency range (Frequencyrange): 50Hz～3.8GHz; Error in judgement (Conformance error): 0.5dB; Have that input dynamic range is big, wide frequency range, characteristics that error in judgement is little.
2, the function of the radio-frequency (RF) switch unit 1-4 of near-end machine: near-end machine radio-frequency (RF) switch unit 1-4 realizes one of same, that alien frequencies is compatible Primary Component.Inside, radio-frequency (RF) switch unit switch at ordinary times is in the connected state of AB, EF.Because the downstream signal power of near-end machine 458MHz is about 0～10dBm, upward signal power is about-20～-10dBm, when not having signal noise power be about-100～-80dBm.The signal detector of radio-frequency (RF) switch unit is monitored the amplitude of 458MHz signal at any time, and judging has no signal, if there is signal just can identify the upstream or downstream signal.
When detecting the 458MHz upward signal, radio-frequency (RF) switch keeps the connected state of original AB, EF constant, is in the mode of operation that alien frequencies duplex or joining common-frequency simplex travelling carriage are called out this moment.
When detecting the 458MHz downstream signal, radio-frequency (RF) switch is controlled connected state automatically and is become AC, ED, is in the mode of operation that the joining common-frequency simplex station console is called out this moment.Power supply (model: LM7805), control circuit (model: LM2904).
3, the radio-frequency (RF) switch unit 2-61 circuit theory of remote termination: during the device standby state, radio-frequency relay (model: 1S21218) be in the AB connected state.Radiofrequency signal enters this modular unit from the RF1 port of Fig. 6 earlier, coupling is given RF power sensing circuit (model: AD8362) with signal through microstrip line power, power-sensing circuit is according to magnitude of voltage Vout of the corresponding output of different input radio frequency power, then this magnitude of voltage Vout is inputed to operational amplifier LMV321, LMV321 compares the size of Vout and reference voltage V 1+.
When Vout＞V1+, LMV321 control switch chip 1 switches to the AC connected state.
When Vout＜V1+, LM2904 control switch chip 1 switches to the AB connected state.
The radio-frequency relay that Unit 1, radio-frequency (RF) switch unit adopts is that Beijing hundred million steps the 1S21218 radio-frequency relay of winning telecom technology co., ltd.In the time of (0.1-1.0GHz), 1S21218 relay Specifeca tion speeification is:
Isolation (Isolation): 80dB; Insert loss (Insertion loss): 0.2dB; 1dB compression point input power (Inputpower for 1dB compression): 50dBm; Control voltage (Control voltages): 11-14Vdc; Standing-wave ratio (VSWR): 1.10; Switching time (Switching Time): 15ms; Machinery switching times (Mechanical Life): greater than 1,000,000 times; Have isolation height, standing-wave ratio little, insert loss little, bear high-power characteristics.
The radio-frequency power detection chip adopts the AD8362 chip of U.S. ADI company.AD8362 chip Specifeca tion speeification is:
Input dynamic range (Input dynamic range) :-52dBm～+ 8dBm in 50 Ω; Frequency range (Frequencyrange): 50Hz～3.8GHz; Error in judgement (Conformance error): 0.5dB; Have that input dynamic range is big, wide frequency range, characteristics that error in judgement is little.
4, remote termination radio-frequency (RF) switch unit 2-6 function: the radio-frequency (RF) switch unit of optical fiber repeater remote termination also is that equipment is realized together, the compatible Primary Component of alien frequencies.Inside, radio-frequency (RF) switch unit switch at ordinary times is in
ABConnected state.The radio-frequency (RF) switch of remote termination has the signal amplitude detection function because the downstream signal power of remote termination 458MHz is about 30～43dBm, upward signal power is about-80～-30dBm, when not having signal noise power be about-100～-80dBm.The signal detector of radio-frequency (RF) switch unit is monitored the amplitude of 458MHz signal at any time, and judging has no signal, if there is signal just can identify the upstream or downstream signal.
When detecting the 458MHz upward signal, it is original that radio-frequency (RF) switch keeps
ABConnected state constant, be in the mode of operation that alien frequencies duplex or joining common-frequency simplex travelling carriage are called out this moment.
When detecting the 458MHz downstream signal, radio-frequency (RF) switch is controlled connected state automatically and is become
AC, be in the mode of operation that the joining common-frequency simplex station console is called out this moment.
The built-in directional coupler of optical fiber repeater near-end machine, this device are the 30dB directional coupler that Nanjing Saigew Microwave Science ﹠ Technology Co., Ltd. produces, model C UL-0410-30dB.The running number information that it can directly be exported in the Railroad Communication System is given running number Rcv decoder equipment, has saved the antenna of running number Rcv decoder equipment.
Directional coupler is between up low noise amplifier unit and near-end radio-frequency (RF) switch unit.The near-end radio-frequency (RF) switch is in when receiving up running number information
AB,
EFConnected state, the far end radio frequency switch is in
ABConnected state.When descending emission homogenous frequency signal, utilize the isolation of radio-frequency (RF) switch can effectively avoid of the interference of descending homogenous frequency signal to up running number information.Power supply (model: LM7805), control circuit (model: LMV321).
5, together the optical fiber repeater operation principle of alien frequencies pattern compatibility: the radio-frequency (RF) switch operating frequency is little, and the receiving and transmitting signal isolation is big.In railway wireless dispatching system, most of communications status does not make radio-frequency (RF) switch move, and has simplified communication process.Following table is the pairing radio-frequency (RF) switch states of various communications status.
(1), pilot frequency communication process
A, downstream signal: the descending 468MHz signal that station radio set sends is coupled to optical fiber repeater near-end machine, via the radio-frequency (RF) switch of near-end machine
EFPassage is transmitted into signal and is transmitted to remote termination in the optical fiber by electricity/light conversion.The signal of telecommunication that remote termination is converted to by light/electricity amplifies 468MHz passage by duplexer to antenna or leaky cable through descending power amplifier module again, and radiation covers feeble field zone by force then.
B, upward signal: the up 458MHz signal that locomotive station sends is amplified by up LNA module through circulator after being received by the optical fiber repeater remote termination via antenna again, signal is transmitted into is transmitted to the near-end machine in the optical fiber by electricity/light conversion.The near-end machine amplifies signal by light/electricity conversion again, via the radio-frequency (RF) switch unit of near-end machine
ABPassage enters duplexer, is coupled to station radio set.
(2), with the frequency communication process
A, downstream signal: the descending 458MHz signal that station radio set sends is coupled to optical fiber repeater near-end machine, via the radio-frequency (RF) switch of near-end machine
ACWith
EDPassage, and by the conversion of electricity/light signal is transmitted into and is transmitted to remote termination in the optical fiber; Remote termination passes through the radio-frequency (RF) switch of the 458MHz passage of duplexer to remote termination through descending power amplifier module amplification again by the signal of telecommunication that light/electricity is converted to, via it
ACPassage, then via the 458MHz passage of another duplexer to antenna or leaky cable, radiation covers feeble field zone by force.
B, upward signal: after the up 458MHz signal that locomotive station sends is received by the optical fiber repeater remote termination via antenna, to the radio-frequency (RF) switch of remote termination, via it
ABPassage is amplified by up LNA module again, signal is transmitted into is transmitted to the near-end machine in the optical fiber by electricity/light conversion.The near-end machine amplifies signal by light/electricity conversion again, via the radio-frequency (RF) switch unit of near-end machine
ABPassage enters duplexer, is coupled to station radio set.
Claims (3)
- One kind with, the optical fiber repeater of alien frequencies pattern compatibility, comprise the repeater near-end machine (1) that is connected by optical fiber, repeater remote termination (2), described repeater near-end machine (1) comprises duplexer (1-1) and the up low noise amplifier (1-3) that is connected with optical module (1-2), described repeater remote termination (2) comprises duplexer (2-1) and the optical module (2-4) that links to each other successively with up low noise amplifier (2-5), downlink power amplifier (2-3), duplexer (2-2), it is characterized in that: also comprise radio-frequency (RF) switch unit (1-4), radio-frequency (RF) switch unit (2-6), directional coupler (1-5), described directional coupler (1-5) end links to each other with the up low noise amplifier (1-3) of repeater near-end machine (1), the other end is connected with radio-frequency (RF) switch unit (1-4), radio-frequency (RF) switch unit (1-4) respectively with duplexer (1-1), optical module (1-2) connects; Described radio-frequency (RF) switch unit (2-6) is connected with duplexer (2-1), duplexer (2-2), the up low noise amplifier (2-5) of repeater remote termination respectively.
- 2. according to claim 1 same, the optical fiber repeater of alien frequencies pattern compatibility, it is characterized in that: described radio-frequency (RF) switch unit (1-4) comprises the radio-frequency (RF) switch chip (1-41) that links to each other with power supply, radio-frequency (RF) switch chip (1-42), control circuit, power-sensing circuit, described power-sensing circuit is connected with control circuit, control circuit respectively with radio-frequency (RF) switch chip (1-42), radio-frequency (RF) switch chip (1-41) is connected, the F pin of radio-frequency (RF) switch chip (1-42) connects the descending 468MHz signal of RF1, it is the descending 468MHZ output signal of descending 458MHZ/ that the E pin meets RF4, the D pin links to each other with the C pin of radio-frequency (RF) switch chip (1-41), and radio-frequency (RF) switch chip (1-41) A pin meets the descending 458MH of RF2 2It is up 458MHZ output signal that signal, B pin meet RF3.
- 3. according to claim 1 same, the optical fiber repeater of alien frequencies pattern compatibility, it is characterized in that: described radio-frequency (RF) switch unit (2-6), comprise radio-frequency relay (2-61), power circuit, power-sensing circuit, control circuit, described power circuit respectively with radio-frequency relay (2-61), power-sensing circuit, control circuit connects, described power-sensing circuit is connected with radio-frequency relay (2-61) by control circuit, and radio-frequency relay (2-61) C pin connects the descending 458MHZ signal of RF1, the B pin connects the up 458MHZ signal of RF2, it is the descending 458MHZ output signal of up 458MHZ/ that the A pin meets RF3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202216683U CN201523385U (en) | 2009-10-29 | 2009-10-29 | Fiber optic repeater compatible with homogeneous frequency mode and heterogeneous frequency mode |
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| CN2009202216683U CN201523385U (en) | 2009-10-29 | 2009-10-29 | Fiber optic repeater compatible with homogeneous frequency mode and heterogeneous frequency mode |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102802271A (en) * | 2011-05-24 | 2012-11-28 | 启碁科技股份有限公司 | Wireless communication method |
| CN103227676A (en) * | 2013-04-11 | 2013-07-31 | 三维通信股份有限公司 | Repeater realization device and method capable of realizing self detection |
| CN103684569B (en) * | 2012-09-05 | 2016-12-21 | 京信通信***（中国）有限公司 | Special-shaped repeater compatible apparatus and repeater |
| CN109379141A (en) * | 2018-11-21 | 2019-02-22 | 广州飞瑞敖电子科技股份有限公司 | A kind of time division duplex light-carried wireless Transmission system |
-
2009
- 2009-10-29 CN CN2009202216683U patent/CN201523385U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102802271A (en) * | 2011-05-24 | 2012-11-28 | 启碁科技股份有限公司 | Wireless communication method |
| CN103684569B (en) * | 2012-09-05 | 2016-12-21 | 京信通信***（中国）有限公司 | Special-shaped repeater compatible apparatus and repeater |
| CN103227676A (en) * | 2013-04-11 | 2013-07-31 | 三维通信股份有限公司 | Repeater realization device and method capable of realizing self detection |
| CN103227676B (en) * | 2013-04-11 | 2015-07-22 | 三维通信股份有限公司 | Repeater realization method capable of realizing self detection |
| CN109379141A (en) * | 2018-11-21 | 2019-02-22 | 广州飞瑞敖电子科技股份有限公司 | A kind of time division duplex light-carried wireless Transmission system |
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Address after: 300462 Binhai New Area, Tianjin economic and Technological Development Zone, North Street, No. 141 Patentee after: Tianjin 712 Communications Broadcasting Limited by Share Ltd Address before: 300140 Hebei District new road, Tianjin, No. 185 Patentee before: Tianjin 712 Communication Broadcast Co., Ltd. |
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Granted publication date: 20100707 |