CN203387690U - Multi-mode digital DAS supporting multi-source access - Google Patents

Multi-mode digital DAS supporting multi-source access Download PDF

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Publication number
CN203387690U
CN203387690U CN201320449677.4U CN201320449677U CN203387690U CN 203387690 U CN203387690 U CN 203387690U CN 201320449677 U CN201320449677 U CN 201320449677U CN 203387690 U CN203387690 U CN 203387690U
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China
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far
radio frequency
fpga
expanding element
access unit
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Expired - Fee Related
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CN201320449677.4U
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Chinese (zh)
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陈青松
吴志坚
李鑫
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Sunwave Communications Co Ltd
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Sunwave Communications Co Ltd
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Abstract

The utility model relates to a multi-mode digital DAS (distribute antenna system) supporting multi-source access. A near-end fiber transmission link is connected with a near-end FPGA, the near-end FPGA is respectively connected with a near-end analog-to-digital conversion chip and a near-end digital-to-analog conversion chip, the near-end analog-to-digital conversion chip is connected with a downlink part of a near-end radio frequency link, the near-end digital-to-analog conversion chip is connected with an uplink part of the near-end radio frequency link, and the downlink part of the near-end radio frequency link and the uplink part of the near-end radio frequency link are respectively connected with a diplexer. The multi-mode digital DAS supporting multi-source access is advantaged in that when coverage of multi-standard signals is needed to realize, and different-standard base stations are at different places, the sub AUs can be placed, the multi-standard signals are integrated together through a mode above and are transmitted to one same RU, RU output is coupled through a POI, signal coverage is carried out through an antenna feed system set, so simultaneous coverage of the multi-standard signals can be realized only through one system set, and thereby system cost and construction difficulty are reduced.

Description

Support the multimode numeral DAS system of multiple source access
Technical field
The utility model relates to the mobile communication Covering domain, relates in particular to a kind of multimode numeral DAS system of supporting the multiple source access.
Background technology
Existing indoor mobile communication environment has the perfect place of too many needs:
The covering aspect, shielding and absorption due to building self, caused the loss that radio wave is larger, and the strong district of feeble field that has formed movable signal is blind area even; The capacity aspect, building is such as large-scale shopping plaza, conference centre, and because mobile phone uses density excessive, the localized network capacity can not be met consumers' demand, wireless channel generation congestion phenomenon; The quality aspect, very easily there is radio frequency interference in the building upper space, and ping-pong handover effect, appear in the Serving cell jitter, and voice quality is difficult to guarantee, and the call drop phenomenon occurs.
DAS(Distribute Antenna System) system is a kind of means that effectively address the above problem at present.The construction of DAS system, can improve the speech quality in building comparatively all sidedly, improves the call completion of mobile telephone rate, hews out high-quality indoor mobile communication zone; Simultaneously, use micro cellular system can share the outdoor macro honeycomb traffic, enlarge network capacity, improve on the whole mobile network's service level.
Existing digital DAS system comprises access unit AU(Access Unit), expanding element EU(Expansion Unit) and far-end unit RU(Remote Unit), pass through optical fiber or Double-strand transmission signal between each unit.The AU unit, by the wireless signal of RF-coupled base station, carries out analog-to-digital conversion and digital filtering and processes, and through the EU unit, is transferred to RU, is converted to emission of radio frequency signals to antenna.
Only has an AU unit in traditional DAS system, for from the BTS coupled signal.For multimode DAS system, if the BTS of different systems is positioned at different physical locations, need many cover systems just can complete the covering of multi-modulation scheme signal.Brought thus constructional difficulties, the high series of problems that waits of equipment cost.
The utility model content
The purpose of this utility model is to overcome the deficiency that prior art exists, and a kind of multimode numeral DAS system of supporting the multiple source access is provided, and never can support with a plurality of base stations of physics position incoming radio frequency signals simultaneously.
The purpose of this utility model completes by following technical solution, and it comprises near-end access unit AU, expanding element EU, and far-end unit RU, described near-end access unit AU, expanding element EU are connected by optical fiber with far-end unit RU;
Described near-end access unit AU comprises: duplexer, near-end radio frequency link ascender, near-end radio frequency link descender, the near-end analog-digital chip, the near-end modulus conversion chip, near-end FPGA and near-end fiber transmission link, described near-end fiber transmission link is connected with near-end FPGA, described near-end FPGA is connected with the near-end analog-digital chip with the near-end modulus conversion chip respectively, the near-end modulus conversion chip is connected with near-end radio frequency link descender, the near-end analog-digital chip is connected with near-end radio frequency link ascender, near-end radio frequency link descender is connected with duplexer respectively with near-end radio frequency link ascender,
Described expanding element EU comprises: expanding element fiber transmission link, expanding element FPGA, expanding element gigabit Ethernet mouth, described expanding element fiber transmission link is connected with expanding element FPGA, and expanding element FPGA is connected with expanding element gigabit Ethernet mouth;
Described far-end unit RU comprises: duplexer, power amplifier, low noise amplifier, far end radio frequency link ascender, far end radio frequency link descender, the far-end analog-digital chip, the far-end modulus conversion chip, far-end FPGA, distal fiber transmission link and far-end gigabit Ethernet mouth, described duplexer is connected with low noise amplifier with power amplifier respectively, power amplifier successively with far end radio frequency link descender, far-end analog-digital chip and far-end FPGA are connected, low noise amplifier successively with far end radio frequency link ascender, far-end modulus conversion chip and far-end FPGA are connected, described far-end FPGA is connected with distal fiber transmission link and far-end gigabit Ethernet mouth.
As preferably, support the interconnected of near-end access unit AU, can access the DAS system with the base station radio-frequency signal of realizing a plurality of different physical locations simultaneously; When described near-end access unit AU is interconnected, from being divided in logic main near-end access unit AU and from near-end access unit AU, only realize the access function of radiofrequency signal from near-end access unit AU, main near-end access unit AU, when realizing the radiofrequency signal access, also is responsible for monitoring, management and the maintenance function of whole system.
As preferably, the Optical Fiber Transmission agreement of described near-end access unit AU, expanding element EU and far-end unit RU, based on the reorganization of CPRI agreement, supports the signal of multiple types to transmit simultaneously, supports the transmission of gigabit ethernet signal simultaneously.
As preferably, the signal process part in the FPGA of described near-end access unit AU and far-end unit RU comprises DDC and DUC, and every passage prop root is the signal bandwidth of border input factually, but separate configurations is 10MHz, 20MHz, 40MHz and 60MHz.
As preferably, described expanding element EU and far-end unit RU support the transparent transmission of gigabit Ethernet.
As preferably, support only to pass through near-end access unit AU and far-end unit RU networking, can realize the function of conventional digital optical fiber repeater.
The beneficial effects of the utility model are: realize the multi-modulation scheme signal when needs and cover simultaneously, and the base station of different systems is in the time of different location, can be by placing from AU, in the manner described above the multi-modulation scheme signal is synthesized to together, be transferred to same RU unit, RU output is carried out the signal covering with a set of antenna-feedback system after the POI coupling, when so just only needing a cover system can realize the multi-modulation scheme signal, covers, and has reduced system cost and difficulty of construction.
The accompanying drawing explanation
Fig. 1 is topology diagram of the present utility model.
Fig. 2 is the utility model AU device interior module diagram one.
Fig. 3 is the utility model RU device interior module diagram one.
Fig. 4 is the utility model AU device interior module diagram two.
Fig. 5 is the utility model RU device interior module diagram two.
Fig. 6 is the utility model EU device interior module diagram.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is described in further detail.
Fig. 1 is topology diagram of the present utility model.Wherein AU1 is as main near-end access unit AU, and AU2 and AU3 are as from near-end access unit AU.AU2 and AU3 are respectively from different base station coupling radiofrequency signals, after digital processing from Optical Fiber Transmission to main near-end access unit AU, together with the signal received with main near-end access unit AU, by Optical Fiber Transmission, to expanding element EU, main near-end access unit AU maximum can connect 4 EU equipment to framing.
Expanding element EU major function is the expansion of light mouth and the access of gigabit Ethernet.Every expanding element EU equipment can connect 8 far-end unit RU, and supports the EU cascade network of maximum 8 grades.
The signal that far-end unit RU will receive from optical fiber carries out Digital IF Processing, outputs to POI after up-conversion and power amplification and is closed road, finally outputs to the covering that antenna-feedback system is realized signal.Far-end unit RU can support maximum 6 grades of cascades.
The utility model can also be supported only with main near-end access unit AU and far-end unit RU, to carry out networking, and its advantage is when the area that need to cover is less to save expanding element EU equipment, reduces costs.
Fig. 2 is AU device interior hardware circuit module schematic diagram.AU equipment is supported 4 independently radio-frequency channels, can support the signal of 4 kinds of different systems to access simultaneously.
In Fig. 2, each Elementary Function is as follows:
Duplexer: duplexer receives the downstream signal of base station output, the uplink signal transmissions of the machine is arrived to base station simultaneously.It is comprised of the stop-band filter of two groups of different frequencies, guarantees to receive and send to work simultaneously.
Frequency conversion and filter circuit: comprise LO circuit (Local Oscillator), upconverter, low-converter and filter.LO produces carrier frequency signaling, is input to upconverter and low-converter.Upconverter employing AQM(Analog Quardrature Modulation) circuit is realized, the IQ signal of intermediate frequency is modulated to the radiofrequency signal of wanted carrier frequency.Low-converter adopts mixting circuit to realize, by mixing under radiofrequency signal, obtains required intermediate-freuqncy signal.Add filter in circuit, suppress the outer spectrum component of required passband simultaneously.
D/A switch and mould/number conversion circuit: comprise ADC and frequency overlapped-resistable filter before, and DAC and image-reject filter afterwards.High performance ADC and DAC have guaranteed the maximum 60MHz of support of single channel signal bandwidth.
FPGA:FPGA comprises Digital IF Processing device and fiber optic protocols processor.
The Digital IF Processing device comprises DDC(Digital Down Convert) and DUC(Digital Up Convert) and power detection, ALC(Auto Level Control) etc. other miscellaneous function.DDC and DUC are one of core technologies of software radio (Software Defined Radio), are also key points of the present utility model.DDC carries out channel filtering according to the bandwidth of input radio frequency channel signal, and is drawn into suitable sample rate.The utility model is supported 4 kinds of different bandwidth settings, be respectively 10MHz, 20MHz, 40MHz, 60MHz, the DDC module is carried out down-sampling by the digital signal of these 4 kinds of bandwidth respectively, obtains the digital signal that sample rate is 11.52MSps, 23.04MSps, 46.08MSps and 69.12MSps.The advantage of above-mentioned processing is, the narrow passage for signal bandwidth, by reducing data rate, can save fiber bandwidth.
The processing procedure of DUC is contrary with DDC, and the sample rate by the Interpolation of signals of low sampling rate to DAC is suppressed the spectral image produced in processing procedure by filter simultaneously.
Optical Fiber Transmission agreement of the present utility model is based on CPRI(Common Public Radio Interface) reorganization, but to meet the transmission requirement of Multi-channel multi-system signal flexible configuration.
Digital signal after the DDC resume module, according to the rule of Optical Fiber Transmission agreement, arrives expanding element EU by Optical Fiber Transmission.
According to mentioned above, near-end access unit AU comprises 6 optical fiber interfaces, and wherein 2 for supporting the AU cascade with expansion input channel quantity.As from near-end access unit AU the time, only transmit the data received from the machine radio-frequency channel as near-end access unit AU; , except the data that transmission the machine radio-frequency channel receives, also need the data of coming from near-end access unit AU transmission are reconfigured during as main near-end access unit AU as near-end access unit AU, be transferred to together expanding element EU.
Main near-end access unit AU of the present utility model can connect 2 from near-end access unit AU simultaneously, far-end unit RU supports cascade simultaneously, every near-end access unit AU and far-end unit RU equipment all have 4 independently radio-frequency channels, therefore a set of equipment (AU+EU+RU) maximum can be supported the independently signal access of 12 tunnels, under the environment of multi-operator multi-modulation scheme, reduced greatly number of devices, reduced the complexity of networking, greatly reduce costs, this also just the utility model with respect to the sharpest edges of traditional DAS equipment.
Fig. 3 is RU device interior hardware circuit module schematic diagram.The course of work of far-end unit RU and near-end access unit AU is similar, and difference is to increase low noise amplifier LNA in up link, increases power amplifier PA in down link, increases signal cover and improves receiving sensitivity.
The utility model far-end unit RU course of work is: receive the light signal that comes from expanding element EU or near-end access unit AU from optical fiber, enter FPGA and carry out digital processing after opto-electronic conversion.FPGA parses needed signal from fiber optic protocols, through Digital Up Convert DUC, processes laggard row D/A switch, through up-conversion and filter circuit, sends into power amplifier PA module and carries out the signal amplification, with the signal strength signal intensity requirement in ensuring coverage zone.Each radio-frequency channel is sent into the radiofrequency signal after amplifying antenna-feedback system and is realized that signal covers after the POI coupling.Up direction, from antenna reception to signal after low noise amplifier LNA amplifies, through down-conversion and filter circuit, after Digital Down Convert DDC processes, carry out mould/number conversion, finally by near-end access unit AU, output to base station.
Gigabit ethernet signal by expanding element EU access is exported by network interface after the RU end recovers, can the plug-in wireless covering that realizes WLAN, or access other IP device, ethernet channel is provided.
Be understandable that, for a person skilled in the art, to the technical solution of the utility model and utility model, design is equal to replace or change and all should be belonged to the protection range of the appended claim of the utility model.

Claims (5)

1. a multimode numeral DAS system of supporting multiple source access is characterized in that: comprise near-end access unit AU, and expanding element EU, far-end unit RU, described near-end access unit AU, expanding element EU are connected by optical fiber with far-end unit RU;
Described near-end access unit AU comprises: duplexer, near-end radio frequency link ascender, near-end radio frequency link descender, the near-end analog-digital chip, the near-end modulus conversion chip, near-end FPGA and near-end fiber transmission link, described near-end fiber transmission link is connected with near-end FPGA, described near-end FPGA is connected with the near-end analog-digital chip with the near-end modulus conversion chip respectively, the near-end modulus conversion chip is connected with near-end radio frequency link descender, the near-end analog-digital chip is connected with near-end radio frequency link ascender, near-end radio frequency link descender is connected with duplexer respectively with near-end radio frequency link ascender,
Described expanding element EU comprises: expanding element fiber transmission link, expanding element FPGA, expanding element gigabit Ethernet mouth, described expanding element fiber transmission link is connected with expanding element FPGA, and expanding element FPGA is connected with expanding element gigabit Ethernet mouth;
Described far-end unit RU comprises: duplexer, power amplifier, low noise amplifier, far end radio frequency link ascender, far end radio frequency link descender, the far-end analog-digital chip, the far-end modulus conversion chip, far-end FPGA, distal fiber transmission link and far-end gigabit Ethernet mouth, described duplexer is connected with low noise amplifier with power amplifier respectively, power amplifier successively with far end radio frequency link descender, far-end analog-digital chip and far-end FPGA are connected, low noise amplifier successively with far end radio frequency link ascender, far-end modulus conversion chip and far-end FPGA are connected, described far-end FPGA is connected with distal fiber transmission link and far-end gigabit Ethernet mouth.
2. the multimode numeral DAS system of support multiple source access according to claim 1, is characterized in that: support the interconnected of near-end access unit AU, with the base station radio-frequency signal of realizing a plurality of different physical locations, can access the DAS system simultaneously; When described near-end access unit AU is interconnected, from being divided in logic main near-end access unit AU and from near-end access unit AU, only realize the access function of radiofrequency signal from near-end access unit AU, main near-end access unit AU, when realizing the radiofrequency signal access, also is responsible for monitoring, management and the maintenance function of whole system.
3. the multimode numeral DAS system that support multiple source according to claim 1 accesses, it is characterized in that: the Optical Fiber Transmission agreement of described near-end access unit AU, expanding element EU and far-end unit RU is adapted based on the CPRI agreement, support the signal of multiple types to transmit simultaneously, support the transmission of gigabit ethernet signal simultaneously.
4. the multimode numeral DAS system that support multiple source according to claim 1 accesses, it is characterized in that: the signal process part in the FPGA of described near-end access unit AU and far-end unit RU comprises DDC and DUC, every passage prop root is the signal bandwidth of border input factually, and separate configurations is 10MHz, 20MHz, 40MHz or 60MHz.
5. the multimode numeral DAS system of support multiple source access according to claim 1, is characterized in that: the transparent transmission of described expanding element EU and far-end unit RU support gigabit Ethernet.
CN201320449677.4U 2013-07-24 2013-07-24 Multi-mode digital DAS supporting multi-source access Expired - Fee Related CN203387690U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103379674A (en) * 2013-07-24 2013-10-30 三维通信股份有限公司 Multimode digital DAS supporting multi-information-source access
CN107889283A (en) * 2016-09-29 2018-04-06 中兴通讯股份有限公司 A kind of base station and the switching method of hardware corridor
CN108738020A (en) * 2018-04-13 2018-11-02 三维通信股份有限公司 A kind of authorization management method and system of DAS communication system signals transmission bandwidth
US11722184B2 (en) * 2017-01-20 2023-08-08 Teko Telecom S.R.L. Distributed antenna system for massive MIMO applications

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103379674A (en) * 2013-07-24 2013-10-30 三维通信股份有限公司 Multimode digital DAS supporting multi-information-source access
CN103379674B (en) * 2013-07-24 2016-04-20 三维通信股份有限公司 A kind of multimode numeral DAS system supporting multiple source to access
CN107889283A (en) * 2016-09-29 2018-04-06 中兴通讯股份有限公司 A kind of base station and the switching method of hardware corridor
US11722184B2 (en) * 2017-01-20 2023-08-08 Teko Telecom S.R.L. Distributed antenna system for massive MIMO applications
CN108738020A (en) * 2018-04-13 2018-11-02 三维通信股份有限公司 A kind of authorization management method and system of DAS communication system signals transmission bandwidth
CN108738020B (en) * 2018-04-13 2020-10-23 三维通信股份有限公司 Authorization management method and system for signal transmission bandwidth of DAS (data acquisition System)

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140108

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CF01 Termination of patent right due to non-payment of annual fee