CN203788468U - Digital optical fiber remote device with GSM, DCS, TD-SCDMA and WLAN coexistence - Google Patents

Digital optical fiber remote device with GSM, DCS, TD-SCDMA and WLAN coexistence Download PDF

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Publication number
CN203788468U
CN203788468U CN201420175817.8U CN201420175817U CN203788468U CN 203788468 U CN203788468 U CN 203788468U CN 201420175817 U CN201420175817 U CN 201420175817U CN 203788468 U CN203788468 U CN 203788468U
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China
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far
processing module
digital
dcs
gsm
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CN201420175817.8U
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熊喆星
贾小涛
张慧文
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Shanghai Xinmin Communication Tech Co Ltd
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Shanghai Xinmin Communication Tech Co Ltd
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Abstract

The utility model discloses a digital optical fiber remote device with GSM, DCS, TD-SCDMA and WLAN coexistence. The digital optical fiber remote device comprises a near-end machine connected with a mobile communication base station and a far-end machine arranged at a cover end, wherein the near-end machine includes a near-end multiplexer, a multimode digital optical fiber near-end processing module and a near-end optical transceiver module, the near-end multiplexer is connected with the multimode digital optical fiber near-end processing module, and the multimode digital optical fiber near-end processing module is connected with the near-end optical transceiver module; and the far-end machine includes a far-end optical transceiver module, a multimode digital optical fiber far-end processing module and a far-end multiplexer, the far-end optical transceiver module is connected with the near-end optical transceiver module through an optical fiber, the far-end optical transceiver module is connected with the multimode digital optical fiber far-end processing module, the far-end multiplexer is connected with the multimode digital optical fiber far-end processing module, and the far-end multiplexer is connected with an antenna. The digital optical fiber remote device with GSM, DCS, TD-SCDMA and WLAN coexistence implements 4G, 2G, 3G and WLAN signals on a set of equipment, and achieves the four-mode fusion.

Description

The remote digital optical fiber device that GSM, DCS, TD-SCDMA and WLAN coexist
Technical field:
The utility model relates to electricity field, relates in particular to mechanics of communication, the remote digital optical fiber device that particularly a kind of GSM, DCS, TD-SCDMA and WLAN coexist.
Background technology:
Along with the 4G licence plate of TD-LTE is provided, build for the 4G network of mobile communication.For the construction of newly-built community or covering blind spot, the 4G technology of a new generation is the emphasis of building.Because 4G technology can coexist a period with 2G and 3G technology, in prior art, the common location of GSM, DCS, TD-SCDMA and WLAN covers and adopts single replace mode, need to monitor respectively the ruuning situation of 4G, 2G, 3G and wlan device, cost is high, causes a large amount of personnel, the waste of fiber resource.
Summary of the invention:
The remote digital optical fiber device that provides a kind of GSM, DCS, TD-SCDMA and WLAN to coexist is provided the purpose of this utility model, and the common location that the remote digital optical fiber device that described this GSM, DCS, TD-SCDMA and WLAN coexists will solve GSM in prior art, DCS, TD-SCDMA and WLAN covers the technical problem that adopts single replace mode to cause the waste of personnel and fiber resource.
This GSM of the present utility model, DCS, the remote digital optical fiber device that TD-SCDMA and WLAN coexist, comprise that a near-end machine being connected with mobile communication base station and one are positioned over the remote termination of capped end, wherein, in described near-end machine, include near-end multiplexer, multimode digital fiber near-end processing module and near-end optical transceiver module, described near-end multiplexer is connected with described multimode digital fiber near-end processing module, multimode digital fiber near-end processing module is connected with described near-end optical transceiver module, in near-end multiplexer, include near-end GSM duplexer, near-end DCS duplexer, near-end TD filter and near-end WLAN filter, in described remote termination, include far-end optical transceiver module, multimode digital fiber remote processor module and far-end multiplexer, described far-end optical transceiver module is connected with near-end optical transceiver module by optical fiber, far-end optical transceiver module is connected with described multimode digital fiber remote processor module again, described far-end multiplexer is connected with multimode digital fiber remote processor module, in far-end multiplexer, include far-end GSM duplexer, far-end DCS duplexer, far-end TD filter and far-end WLAN filter, far-end multiplexer is connected with antenna.
Further, in described multimode digital fiber near-end processing module, include a first near-end upconverter, a first near-end low-converter, a second near-end upconverter, a second near-end low-converter, a near-end synchro switch and a near-end baseband processing module, the first described near-end low-converter is connected with described near-end baseband processing module by a first near-end analog to digital conversion circuit, the first described near-end upconverter is connected with near-end baseband processing module by a first near-end D/A converting circuit, the second described near-end low-converter is connected with near-end baseband processing module by a second near-end analog to digital conversion circuit, the second described near-end upconverter is connected with near-end baseband processing module by a second near-end D/A converting circuit, described near-end synchro switch is connected with near-end baseband processing module with a 3rd near-end analog to digital conversion circuit by a 3rd near-end D/A converting circuit, near-end GSM duplexer is connected with the first near-end upconverter and the first near-end low-converter, near-end DCS duplexer is connected with the second near-end upconverter and the second near-end low-converter, near-end TD filter is connected with near-end synchro switch, near-end WLAN filter is connected with near-end baseband processing module.
Further, in described multimode digital fiber remote processor module, include a first far-end upconverter, a first far-end low-converter, a second far-end upconverter, a second far-end low-converter, a far-end synchro switch and a far-end baseband processing module, the first described far-end low-converter is connected with described far-end baseband processing module by a first far-end analog to digital conversion circuit, the first described far-end upconverter is connected with far-end baseband processing module by a first far-end D/A converting circuit, the second described far-end low-converter is connected with far-end baseband processing module by a second far-end analog to digital conversion circuit, the second described far-end upconverter is connected with far-end baseband processing module by a second far-end D/A converting circuit, described far-end synchro switch is connected with far-end baseband processing module with a 3rd far-end analog to digital conversion circuit by a 3rd far-end D/A converting circuit, far-end GSM duplexer is connected with the first far-end upconverter and the first far-end low-converter by power amplification circuit, far-end DCS duplexer is connected with the second far-end upconverter and the second far-end low-converter by power amplification circuit, far-end TD filter is connected with far-end synchro switch, far-end WLAN filter is connected with far-end baseband processing module.
Further, near-end GSM duplexer is connected with a GSM base station, and near-end DCS duplexer is connected with a DCS base station, and near-end TD filter is connected with a TD base station, and WLAN and an AP(are accessing points, and Access Point is called for short AP) base station connection.
Further, in near-end machine and remote termination, include separately monitoring module and dual-power module redundancy backup.
Operation principle of the present utility model is: utilize capped end multimode digital fiber to process remote end module and process GSM, DCS signal, TD-SCDMA signal and WLAN signal, meet four kinds of wireless communication modes of the prior art.Adopt totally digitilized treatment technology, radio frequency integrated output, together by multimodality fusion simultaneously, can reduce a large amount of active equipments and drop into.Covering website can one-time construction, and the disposable coordination of property reduces and coordinates difficulty, and more 2G, 3G, WLAN net and cover the disposable speed of building a station of building up, accelerated, and have facilitated user's selection flexibility ratio.Multimode signal transmits by an optical cable, all adopt the mode of an optical cable transmission without the every mould that adopts single mode, reduce in a large number optical cable cost and optical cable laying cost, and can in the situation that not increasing cable resource, only need to change the dilatation of multimode far-drawing system with regard to feasible system in single mode website.2G, 3G, WLAN (wireless local area network) are covered simultaneously, improved user's traffic rating and ensured the covering of WLAN (wireless local area network).Capped end multimode digital fiber as key modules and core component is processed distal power amplification module and power acquisition redundancy backup technology, thereby has ensured that the high reliability of system has greatly reduced the fault Probability of equipment.Adopt monitoring software always to monitor multimode information set, can reduce monitor data expense.Adopted automatic carrier tracking technology and carrier frequency broadcast technology for multicarrier multimode far-drawing system, reduced because of base station frequency hopping or channel change cause manually to website, the problem of channel is set, saved a large amount of human costs, reduced manual intervention.Every kind of pattern is all supported broadband, multicarrier standard, and can specifically formulate according to the different demands of applied environment.
Utilize the radiofrequency signal of digital module mapping base station, the complex signal of generation is by filter shaping, digital pre-distortion is placed on to digital baseband or digital intermediate frequency completes, for compensating the nonlinear distortion of power amplifier.
Monitoring module adopts 071 monitor board, adopts centralized monitor technology, and GSM, DCS frequency range, TD-SCDMA frequency range, WLAN frequency range are monitored respectively, has avoided the weakness of decentralized supervisory control.
Adopt redundancy backup technology, when damaging appears in the module of a certain frequency range in GSM, DCS frequency range, TD-SCDMA frequency range, WLAN frequency range, automatically switch to the correlation module of another backup in system, can not impact the module of other frequency range, system is unaffected, can continue normal work.
The utility model and prior art are compared, and its effect is actively with obvious.The utility model adopts carrier wave automatic tracing technology, can automatic tracing GSM, arbitrary carrier wave of DCS frequency range, TD-SCDMA frequency range and WLAN frequency range, in the time that base station carrier changes, near-end unit finds rapidly the carrier wave of variation, and reset, adopt carrier wave Auto broadcast technology, be sent to far-end unit, reach the automatic tracing of base station carrier and arrange.Carrier wave automatic tracing technology has reduced the probability of failure of manual operation frequency, has improved system reliability.4G, 2G, 3G and WLAN signal are put on an equipment and are realized, adopt the ruuning situation of centralized monitor mode detection apparatus, realized the fusion of 4G, 2G, 3G and WLAN.
Brief description of the drawings:
Fig. 1 is the schematic diagram of the remote digital optical fiber device that coexists of GSM of the present utility model, DCS, TD-SCDMA and WLAN.
Fig. 2 is engineering application block diagram of the present utility model.
Fig. 3 is the theory diagram that the multimode digital fiber in the utility model is processed local module.
Fig. 4 is the theory diagram of the remote termination digital light transceiver module in the utility model.
Fig. 5 is the flow chart of GSM in the utility model, DCS, TD-SCDMA and the processing of WLAN digital pre-distortion power amplifying.
Fig. 6 is power supply in the utility model and the redundancy backup schematic diagram of multimode power amplifier module.
Embodiment:
Embodiment 1:
As shown in Figure 1, GSM of the present utility model, DCS, the remote digital optical fiber device that TD-SCDMA and WLAN coexist, comprise that a near-end machine being connected with mobile communication base station 1 and one are positioned over the remote termination 2 of capped end, wherein, in described near-end machine 1, include near-end multiplexer 11, multimode digital fiber near-end processing module and near-end optical transceiver module 13, described near-end multiplexer 11 is connected with described multimode digital fiber near-end processing module, multimode digital fiber near-end processing module is connected with described near-end optical transceiver module 13, in near-end multiplexer 11, include near-end GSM duplexer, near-end DCS duplexer, near-end TD filter and near-end WLAN filter, in described remote termination 2, include far-end optical transceiver module 23, multimode digital fiber remote processor module and far-end multiplexer 21, described far-end optical transceiver module 23 is connected with near-end optical transceiver module 13 by optical fiber 3, far-end optical transceiver module 23 is connected with described multimode digital fiber remote processor module again, described far-end multiplexer 21 is connected with multimode digital fiber remote processor module, in far-end multiplexer 21, include far-end GSM duplexer, far-end DCS duplexer, far-end TD filter and far-end WLAN filter, far-end multiplexer 21 is connected with antenna.
Further, in described multimode digital fiber near-end processing module, include a first near-end upconverter, a first near-end low-converter, a second near-end upconverter, a second near-end low-converter, a near-end synchro switch and a near-end baseband processing module 12, the first described near-end low-converter is connected with described near-end baseband processing module 12 by a first near-end analog to digital conversion circuit, the first described near-end upconverter is connected with near-end baseband processing module 12 by a first near-end D/A converting circuit, the second described near-end low-converter is connected with near-end baseband processing module 12 by a second near-end analog to digital conversion circuit, the second described near-end upconverter is connected with near-end baseband processing module 12 by a second near-end D/A converting circuit, described near-end synchro switch is connected with near-end baseband processing module 12 with a 3rd near-end analog to digital conversion circuit by a 3rd near-end D/A converting circuit, near-end GSM duplexer is connected with the first near-end upconverter and the first near-end low-converter, near-end DCS duplexer is connected with the second near-end upconverter and the second near-end low-converter, near-end TD filter is connected with near-end synchro switch, near-end WLAN filter is connected with near-end baseband processing module 12.
Further, in described multimode digital fiber remote processor module, include a first far-end upconverter, a first far-end low-converter, a second far-end upconverter, a second far-end low-converter, a far-end synchro switch and a far-end baseband processing module 22, the first described far-end low-converter is connected with described far-end baseband processing module 22 by a first far-end analog to digital conversion circuit, the first described far-end upconverter is connected with far-end baseband processing module 22 by a first far-end D/A converting circuit, the second described far-end low-converter is connected with far-end baseband processing module 22 by a second far-end analog to digital conversion circuit, the second described far-end upconverter is connected with far-end baseband processing module 22 by a second far-end D/A converting circuit, described far-end synchro switch is connected with far-end baseband processing module 22 with a 3rd far-end analog to digital conversion circuit by a 3rd far-end D/A converting circuit, far-end GSM duplexer is connected with the first far-end upconverter and the first far-end low-converter by power amplification circuit, far-end DCS duplexer is connected with the second far-end upconverter and the second far-end low-converter by power amplification circuit, far-end TD filter is connected with far-end synchro switch, far-end WLAN filter is connected with far-end baseband processing module 22.
Further, near-end GSM duplexer is connected with a GSM base station, and near-end DCS duplexer is connected with a DCS base station, and near-end TD filter is connected with a TD base station, and WLAN and an AP(are accessing points, and Access Point is called for short AP) base station connection.
Further, in near-end machine 1 and remote termination 2, include separately monitoring module and dual-power module redundancy backup.
Concrete, at down direction, near-end unit in the present embodiment is after receiving the radiofrequency signal of GSM, DCS or TD-SCDMA mobile communication base station, first deliver to the coupler of GSM, DCS and TD-SCDMA, delivering to four mould Digital IF Processing modules processes again, carry out data packing by certain frame format, then through digital light module, send to far-end unit by optical fiber.
Down direction equally, at far-end unit, first receive the signal from optical fiber by digital light module, then process through four mould Digital IF Processing modules, then send to mobile terminal device through GSM, DCS, the descending power amplifier of TD-SCDMA, multiplexer, retransmitting antenna.
At up direction, the up signal of mobile terminal device is through far-end unit, pass through optical fiber, be sent to near-end unit, carry out after low noise amplification processing through four mould Digital IF Processing modules of near-end unit again, coherent signal is radiofrequency signal through contrary flow processing, then sends to GSM, DCS or TD-SCDMA base station.Thus, just completed the far-end covering function of mobile communication base station.
WLAN signal is after receiving the radiofrequency signal of WLAN AC, first deliver to four mode digital optical fiber remote system near-end unit, then deliver to four mould Digital IF Processing modules and process, carry out data packing by certain frame format, through digital light module, send to far-end unit by optical fiber again.At far-end unit, first receive the signal from optical fiber by digital light module, then process through four mould Digital IF Processing modules, then send to mobile terminal device through AP, retransmitting antenna.
At up direction, the up signal of mobile terminal device is through AP, send into again far-end unit, pass through optical fiber, be sent to near-end unit, carry out after low noise amplification processing through four mould Digital IF Processing modules of near-end unit, coherent signal is radiofrequency signal through contrary flow processing, then sends to the AC of WLAN again.Thus, just completed the far-end covering function of WLAN signal.
As shown in Figure 2, after GSM, DCS and TD base station section signal are coupled by coupler, be connected with the BS port of multimode device near-end by mixer.The IP signal of the AP output that WLAN controls by AC or by AC at near-end is connected with the WLAN input port of multimode device near-end.GSM, DCS and TD are sent to cover antenna at the far-end MS of multimode digital device end by feeder line and do user's covering and the transmitting-receiving to GSM, DCS and TD signal.WLAN signal can do at access AP or AP+PA the covering of WLAN after far-end output.
The networking mode of nearly far-end comprises:
1) star-like networking; 2) chain networking; 3) mixed type networking; 4) loop backup formula mixed networking.
As shown in Figure 3 and Figure 4, in the utility model, all convert GSM, DCS frequency range, TD-SCDMA frequency range and WLAN frequency range to intermediate-freuqncy signal and sample.
GSM, DCS and TD down link: the GSM of near-end, after being coupled out by coupler, DCS and TD base station section signal close behind road by mixer again, down link signal through intelligent selection device to the selected road in one of them pattern, (an other road is as backup) is after numerical control decay ATT, again by becoming intermediate-freuqncy signal after analog down ADC, be processed into after digital medium-frequency signal by analog-digital conversion a/d, carry out again Digital Down Convert DDC and become baseband signal, after digital filtering, take charge of after distinctive class CPRI protocol processes by me, become digital optical signal to be transferred to respectively each far-end by optical fiber through digital light module converts again,
The down link of far-end is received the digital optical signal from near-end, after opto-electronic conversion, become digital baseband signal, again after the demodulation of class CPRI, digital filtering, Digital Up Convert DUC becomes digital medium-frequency signal, digital-to-analogue conversion D/A, reverts to GSM, DCS and TD downlink radio-frequency signal after simulation up-conversion AUC, then through power amplifier amplify, multiplexer filtering is transmitted into the area of coverage by retransmitting antenna after processing and carries out multimode covering.
GSM, DCS and TD up link: the user that far-end receives the multimode area of coverage by retransmitting antenna initiatively dials signal, through intelligent selection device to the selected road in one of them pattern, (an other road is as backup), carry out again low noise amplification, after ATT decay, up radiofrequency signal analog down is become to ADC analog if signal, become digital medium-frequency signal by A/D analog-to-digital conversion, by Digital Down Convert DDC, digital filtering becomes digital baseband signal, after class CPRI protocol processes, carrying out electric light by digital light module again converts digital optical signal to and passes to near-end through optical fiber.
And near-end uplink receiving is from the light signal of far-end; after carrying out electric light conversion, digital light module reverts to baseband signal after digital filtering is processed; carry out again Digital Up Convert DUC and become digital medium-frequency signal; digital-to-analogue conversion D/A again; on simulation up-conversion AUC, become GSM, DCS and the up radiofrequency signal of TD, be coupled into each mould base station section through splitter, coupler and process.
The signal of AP that AP pass-through channel: WLAN controls by AC or by AC at near-end output by electricity mouthful conversion special module conversion after again through DSP transparent transmission process with together with other the baseband signal of class CPRI agreement by Optical Fiber Transmission to each multimode remote equipment, after far-end recovers again, do user's covering of WLAN by AP or AP+PA.
The digital fiber multimode processing module major function of multimode, as clock signal wherein, the protocol processes of the conversion of many power supplys, reference signal, filtering, digital-to-analogue conversion or analog-to-digital conversion, Up/Down Conversion, I/Q modulation /demodulation, signal, algorithm, intelligent backup, up low noise amplifier etc. are all by corresponding element circuit or special chip or DSP completes in real time and realization and error correction.
As shown in Figure 5, the utility model has adopted the digital pre-distortion power amplifying treatment technology of high efficiency, low energy consumption, the radiofrequency signal of base station is through the mapping of digital module, the complex signal producing is by cosine filter shaping, digital pre-distortion is placed on to digital baseband or digital intermediate frequency completes, for compensating the nonlinear distortion of power amplifier., unload frequently through quadrature demodulation according to the coupled signal of amplifier output signal, A/D converts rear and the comparison of predistortion input sample signal, carries out the adaptive updates of distorter, and the output signal that makes power amplifier is that the linearity of cosine filter output signal is amplified.
As shown in Figure 6, the utility model has adopted redundancy backup technology.In the time that power module, power amplifier etc. break down, automatically switch to the correlation module of another backup in system, system is unaffected, continues normally to work.

Claims (5)

1. a GSM, DCS, the remote digital optical fiber device that TD-SCDMA and WLAN coexist, comprise that a near-end machine being connected with mobile communication base station and one are positioned over the remote termination of capped end, it is characterized in that: in described near-end machine, include near-end multiplexer, multimode digital fiber near-end processing module and near-end optical transceiver module, described near-end multiplexer is connected with described multimode digital fiber near-end processing module, multimode digital fiber near-end processing module is connected with described near-end optical transceiver module, in near-end multiplexer, include near-end GSM duplexer, near-end DCS duplexer, near-end TD filter and near-end WLAN filter, in described remote termination, include far-end optical transceiver module, multimode digital fiber remote processor module and far-end multiplexer, described far-end optical transceiver module is connected with near-end optical transceiver module by optical fiber, far-end optical transceiver module is connected with described multimode digital fiber remote processor module again, described far-end multiplexer is connected with multimode digital fiber remote processor module, in far-end multiplexer, include far-end GSM duplexer, far-end DCS duplexer, far-end TD filter and far-end WLAN filter, far-end multiplexer is connected with antenna.
2. GSM as claimed in claim 1, DCS, the remote digital optical fiber device that TD-SCDMA and WLAN coexist, it is characterized in that: in described multimode digital fiber near-end processing module, include a first near-end upconverter, a first near-end low-converter, a second near-end upconverter, a second near-end low-converter, a near-end synchro switch and a near-end baseband processing module, the first described near-end low-converter is connected with described near-end baseband processing module by a first near-end analog to digital conversion circuit, the first described near-end upconverter is connected with near-end baseband processing module by a first near-end D/A converting circuit, the second described near-end low-converter is connected with near-end baseband processing module by a second near-end analog to digital conversion circuit, the second described near-end upconverter is connected with near-end baseband processing module by a second near-end D/A converting circuit, described near-end synchro switch is connected with near-end baseband processing module with a 3rd near-end analog to digital conversion circuit by a 3rd near-end D/A converting circuit, near-end GSM duplexer is connected with the first near-end upconverter and the first near-end low-converter, near-end DCS duplexer is connected with the second near-end upconverter and the second near-end low-converter, near-end TD filter is connected with near-end synchro switch, near-end WLAN filter is connected with near-end baseband processing module.
3. GSM as claimed in claim 1, DCS, the remote digital optical fiber device that TD-SCDMA and WLAN coexist, it is characterized in that: in described multimode digital fiber remote processor module, include a first far-end upconverter, a first far-end low-converter, a second far-end upconverter, a second far-end low-converter, a far-end synchro switch and a far-end baseband processing module, the first described far-end low-converter is connected with described far-end baseband processing module by a first far-end analog to digital conversion circuit, the first described far-end upconverter is connected with far-end baseband processing module by a first far-end D/A converting circuit, the second described far-end low-converter is connected with far-end baseband processing module by a second far-end analog to digital conversion circuit, the second described far-end upconverter is connected with far-end baseband processing module by a second far-end D/A converting circuit, described far-end synchro switch is connected with far-end baseband processing module with a 3rd far-end analog to digital conversion circuit by a 3rd far-end D/A converting circuit, far-end GSM duplexer is connected with the first far-end upconverter and the first far-end low-converter by power amplification circuit, far-end DCS duplexer is connected with the second far-end upconverter and the second far-end low-converter by power amplification circuit, far-end TD filter is connected with far-end synchro switch, far-end WLAN filter is connected with far-end baseband processing module.
4. the remote digital optical fiber device that GSM as claimed in claim 1, DCS, TD-SCDMA and WLAN coexist, it is characterized in that: near-end GSM duplexer is connected with a GSM base station, near-end DCS duplexer is connected with a DCS base station, near-end TD filter is connected with a TD base station, and WLAN is connected with an AP base station.
5. the remote digital optical fiber device that GSM as claimed in claim 1, DCS, TD-SCDMA and WLAN coexist, is characterized in that: in near-end machine and remote termination, include separately monitoring module and dual-power module redundancy backup.
CN201420175817.8U 2014-04-11 2014-04-11 Digital optical fiber remote device with GSM, DCS, TD-SCDMA and WLAN coexistence Expired - Fee Related CN203788468U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105406924A (en) * 2015-09-25 2016-03-16 广州埃信电信设备有限公司 Multi-frequency-band digital distributed antenna system
CN105680950A (en) * 2016-01-27 2016-06-15 南京典格通信科技有限公司 Five-mode seven-frequency ten-channel intelligent digital optical fiber indoor distribution system
CN113260096A (en) * 2021-04-30 2021-08-13 上海守正通信技术有限公司 4G/5G dual-mode distributed base station radio frequency unit system architecture and signal processing algorithm

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105406924A (en) * 2015-09-25 2016-03-16 广州埃信电信设备有限公司 Multi-frequency-band digital distributed antenna system
CN105680950A (en) * 2016-01-27 2016-06-15 南京典格通信科技有限公司 Five-mode seven-frequency ten-channel intelligent digital optical fiber indoor distribution system
CN113260096A (en) * 2021-04-30 2021-08-13 上海守正通信技术有限公司 4G/5G dual-mode distributed base station radio frequency unit system architecture and signal processing algorithm

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