WO2018196429A1 - Dispositif d'accès destiné à un système d'antenne distribué - Google Patents

Dispositif d'accès destiné à un système d'antenne distribué Download PDF

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Publication number
WO2018196429A1
WO2018196429A1 PCT/CN2017/119481 CN2017119481W WO2018196429A1 WO 2018196429 A1 WO2018196429 A1 WO 2018196429A1 CN 2017119481 W CN2017119481 W CN 2017119481W WO 2018196429 A1 WO2018196429 A1 WO 2018196429A1
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WO
WIPO (PCT)
Prior art keywords
attenuator
antenna system
duplexer
distributed antenna
access device
Prior art date
Application number
PCT/CN2017/119481
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English (en)
Chinese (zh)
Inventor
邓海龙
张晖
曹松
张宇文
Original Assignee
京信通信系统（中国）有限公司
京信通信系统（广州）有限公司
京信通信技术(广州)有限公司
天津京信通信系统有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 京信通信系统（中国）有限公司, 京信通信系统（广州）有限公司, 京信通信技术(广州)有限公司, 天津京信通信系统有限公司 filed Critical 京信通信系统（中国）有限公司
Publication of WO2018196429A1 publication Critical patent/WO2018196429A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to an access device for a distributed antenna system.
  • nonlinear products of the transmission link may fall into the receiving link, thereby interfering with the sensitivity of the receiving link and the demodulation index.
  • DAS Distributed Antenna System
  • the base station source access end of the distributed antenna system lower passive intermodulation products are required to meet the RF interface requirements.
  • POI Point of Interface
  • the most common method is to directly use the low intermodulation product Point of Interface (POI) to achieve power matching, or directly use the low intermodulation product duplexer to achieve signal power matching.
  • POI Point of Interface
  • the design and complexity of the various components of such equipment is high.
  • An access device for a distributed antenna system comprising:
  • a first attenuator a duplexer, a second attenuator and a third attenuator;
  • An input end of the first attenuator is connected to a source device, an output end of the first attenuator is connected to a combined port of the duplexer, and a receiving port of the duplexer passes the
  • the second attenuator is connected to the receiving end of the distributed antenna system, and the transmitting port of the duplexer is connected to the transmitting end of the distributed antenna system through the third attenuator;
  • the first attenuator attenuates the first downlink signal transmitted by the source device, and outputs a first attenuation signal to the duplexer, where the duplexer filters the first attenuation signal and outputs the first downlink signal. a first filtered signal to the third attenuator, the third attenuator attenuating the first filtered signal, and outputting a second downlink signal to a transmitting end of the distributed antenna system;
  • the second attenuator attenuates the first uplink signal received by the distributed antenna system, and outputs a second attenuation signal to the duplexer, and the duplexer filters the second attenuation signal and outputs the second attenuation signal.
  • the second filtered signal is sent to the first attenuator, and the first attenuator attenuates the second filtered signal to output a second uplink signal to the source device.
  • the first downlink signal transmitted by the source device is attenuated by the first attenuator, sent to the third attenuator via the duplexer, and then attenuated by the third attenuator and output to the distribution.
  • the transmitting end of the antenna system the first uplink signal of the distributed antenna system is attenuated by the second attenuator, sent to the first attenuator via the duplexer, and then attenuated by the first attenuator and output to the source device. While effectively ensuring low intermodulation products, the technical difficulty and indicators of key components are reduced, and the hardware cost of the system is greatly reduced.
  • FIG. 1 is a schematic structural diagram of an access device of a distributed antenna system according to an embodiment
  • FIG. 2 is a schematic structural diagram of an access device of a distributed antenna system according to an embodiment.
  • the present invention provides an access device for a distributed antenna system, which may include:
  • a first attenuator a duplexer, a second attenuator and a third attenuator;
  • An input end of the first attenuator is connected to a source device, an output end of the first attenuator is connected to a combined port of the duplexer, and a receiving port of the duplexer passes the
  • the second attenuator is connected to the receiving end of the distributed antenna system, and the transmitting port of the duplexer is connected to the transmitting end of the distributed antenna system through the third attenuator;
  • the first attenuator attenuates the first downlink signal transmitted by the source device, and outputs a first attenuation signal to the duplexer, where the duplexer filters the first attenuation signal and outputs the first downlink signal. a first filtered signal to the third attenuator, the third attenuator attenuating the first filtered signal, and outputting a second downlink signal to a transmitting end of the distributed antenna system;
  • the second attenuator attenuates the first uplink signal received by the distributed antenna system, and outputs a second attenuation signal to the duplexer, and the duplexer filters the second attenuation signal and outputs the second attenuation signal.
  • the second filtered signal is sent to the first attenuator, and the first attenuator attenuates the second filtered signal to output a second uplink signal to the source device.
  • the source device of this embodiment may be, for example, a base station.
  • the first attenuator of this embodiment may be a fixed attenuator.
  • the first attenuator can be implemented based on a coaxial cable.
  • the second attenuator of this embodiment is an uplink ATT (Attenuator) module, and may be an electrical attenuator.
  • the second attenuator may include a radio frequency switch and a fixed attenuator; the fixed attenuator is connected to the duplexer through the radio frequency switch.
  • the third attenuator of this embodiment is used as a downlink ATT module, and may also be an electrical attenuator.
  • the third attenuator can be implemented with an integrated attenuator chip.
  • the duplexer of this embodiment may be an air dielectric cavity duplexer or a large-sized dielectric duplexer.
  • the first attenuator can be connected to the source device through a transceiver port (TX/RX).
  • TX/RX transceiver port
  • the second attenuator can be coupled to the receiving end of the distributed antenna system via a receive port (RX).
  • RX receive port
  • the third attenuator can be coupled to the transmitting end of the distributed antenna system via a transmit port (TX).
  • the access device of the distributed antenna system may further include a connection with the control end of the second attenuator and the control end of the third attenuator, respectively.
  • the monitoring device monitors the power value of the third attenuator output and the power value of the second attenuator input, and adjusts the third attenuator according to the power value of the third attenuator output Attenuating the value and adjusting the attenuation value of the second attenuator according to the power value of the second attenuator input.
  • the monitoring device may be connected to a host provided in the control center; the monitoring device sends the power value of the second attenuator input end and the power value of the third attenuator output to the host, and Receiving an attenuation control signal returned by the host, and adjusting an attenuation value of the second attenuator and/or the third attenuator according to the attenuation control signal.
  • remote monitoring can be realized, which further facilitates the user to adjust the attenuation values of the second attenuator and the third attenuator.
  • the present invention has the following advantages and beneficial effects:
  • Duplexer Since the high-power signal of the base station downlink is attenuated by the fixed attenuator, the power capacity of the duplexer is lower than the TX/RX port by a fixed attenuation value, and the passive intermodulation products of the duplexer follow As the input power decreases, the intermodulation products go low; while the intermodulation products produced by the duplexer return to the TX/RX port, they also pass a fixed attenuation value. Therefore, the main signal power value of the duplexer in the link is lower than the TX/RX port by a fixed attenuation value, and the passive intermodulation products of the duplexer port are reduced to the TX/RX port, which also reduces the fixed attenuation value.
  • PIM Passive Inter-Modulation
  • the software can control the attenuator method to realize signal control, thereby realizing remote control.
  • the design requirements of the PIM of each device component in the device are greatly reduced.
  • the 1800MHz mobile communication frequency band is taken as an example.
  • the fixed attenuator of the low intermodulation product is implemented by a 50 ohm 18 meter RG402 coaxial cable or a 50 ohm 10.5 meter RG405 coaxial cable, and the duplexer uses a conventional air medium.
  • the cavity duplexer or the large-size dielectric duplexer, the downlink ATT module is implemented by means of an RF switch and a fixed attenuator, and the uplink ATT module is implemented by an integrated ATT chip.
  • the method of use in the present invention is implemented, but not limited to, the method in the examples. Refer to Figure 2. For the sake of narration, the parameters of the relevant components will be listed:
  • the attenuation value of the fixed attenuator of the low intermodulation product is 10 dB, and the passive intermodulation is 165 dBc;
  • the passive intermodulation product after calculating the TX/RX port is approximately 163.8 dBc.
  • the parameters of the respective components are relatively easy to implement with respect to the current state of the art, and the cost is low.
  • only a duplexer with a passive intermodulation of 150 dBc is needed, so that the passive intermodulation products can achieve a performance of 163.8 dBc.
  • a 163.8 dBc duplexer must be used. It can be seen that in order to achieve the same technical effect as the present application, the design of the duplexer in the prior art is too difficult and the yield is low, resulting in high cost.
  • the present application can achieve the same passive intermodulation performance as the prior art of devices with higher performance and design difficulty by using devices with lower performance and design difficulty. It can be seen that the technical solution of the embodiment effectively reduces the design difficulty and performance index requirements of the component, which is very advantageous for reducing complexity and saving cost.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

La présente invention concerne un dispositif d'accès destiné à un système d'antenne distribué, et le dispositif d'accès comprend un premier atténuateur, un duplexeur, un deuxième atténuateur et un troisième atténuateur. L'extrémité d'entrée du premier atténuateur est connectée à un équipement de source de signal, et une extrémité de sortie du premier atténuateur est connectée à un port combineur du duplexeur. Un port de réception du duplexeur est connecté à une extrémité de réception du système d'antenne distribué par l'intermédiaire du deuxième atténuateur. Un port de transmission du duplexeur est connecté à une extrémité de transmission du système d'antenne distribué par l'intermédiaire du troisième atténuateur. Le dispositif d'accès réduit la difficulté technique et l'indice de composants clés tout en garantissant efficacement un produit d'intermodulation faible, et réduit considérablement le coût matériel du système.
PCT/CN2017/119481 2017-04-24 2017-12-28 Dispositif d'accès destiné à un système d'antenne distribué WO2018196429A1 (fr)

Applications Claiming Priority (2)

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CN201710270926.6A CN106941364A (zh) 2017-04-24 2017-04-24 分布式天线系统的接入装置
CN201710270926.6 2017-04-24

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WO2018196429A1 true WO2018196429A1 (fr) 2018-11-01

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CN106941364A (zh) * 2017-04-24 2017-07-11 京信通信技术(广州)有限公司 分布式天线系统的接入装置

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CN102325332A (zh) * 2011-07-25 2012-01-18 芯通科技（成都）有限公司 一种多载波基站延伸覆盖装置系统
CN202798729U (zh) * 2012-10-17 2013-03-13 中国移动通信集团河南有限公司 基站与数字光纤直放站的连接装置
CN103857026A (zh) * 2014-02-27 2014-06-11 京信通信系统（广州）有限公司 下行信号处理装置及方法、信号处理系统及信号处理方法
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KR20170018559A (ko) * 2015-08-10 2017-02-20 주식회사 에이디알에프코리아 멀티밴드, 멀티캐리어를 지원하는 기지국 인터페이스 장치
CN106941364A (zh) * 2017-04-24 2017-07-11 京信通信技术(广州)有限公司 分布式天线系统的接入装置

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KR20030077704A (ko) * 2002-03-26 2003-10-04 주식회사 현대시스콤 광대역-코드분할다중접속 기지국의 원격 안테나인터페이스 장치
CN102325332A (zh) * 2011-07-25 2012-01-18 芯通科技（成都）有限公司 一种多载波基站延伸覆盖装置系统
CN202798729U (zh) * 2012-10-17 2013-03-13 中国移动通信集团河南有限公司 基站与数字光纤直放站的连接装置
CN103857026A (zh) * 2014-02-27 2014-06-11 京信通信系统（广州）有限公司 下行信号处理装置及方法、信号处理系统及信号处理方法
US20170041125A1 (en) * 2015-08-03 2017-02-09 Advanced Rf Technologies, Inc. Distributed antenna system interface tray
KR20170018559A (ko) * 2015-08-10 2017-02-20 주식회사 에이디알에프코리아 멀티밴드, 멀티캐리어를 지원하는 기지국 인터페이스 장치
CN106941364A (zh) * 2017-04-24 2017-07-11 京信通信技术(广州)有限公司 分布式天线系统的接入装置

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