WO2017185682A1 - 一种分布式基站系统 - Google Patents

一种分布式基站系统 Download PDF

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Publication number
WO2017185682A1
WO2017185682A1 PCT/CN2016/102896 CN2016102896W WO2017185682A1 WO 2017185682 A1 WO2017185682 A1 WO 2017185682A1 CN 2016102896 W CN2016102896 W CN 2016102896W WO 2017185682 A1 WO2017185682 A1 WO 2017185682A1
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Prior art keywords
signal
intermediate frequency
analog
processing unit
ifu
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PCT/CN2016/102896
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English (en)
French (fr)
Inventor
詹建明
陈长根
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中兴通讯股份有限公司
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Publication of WO2017185682A1 publication Critical patent/WO2017185682A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools
    • H04W16/20—Network planning tools for indoor coverage or short range network deployment
    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0067—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
    • H04B1/0075—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands using different intermediate frequencied for the different bands
    • H04B1/0078—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands using different intermediate frequencied for the different bands with a common intermediate frequency amplifier for the different intermediate frequencies, e.g. when using switched intermediate frequency filters
    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0067—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
    • H04B1/0082—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/56—Circuits for coupling, blocking, or by-passing of signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components
    • 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

Definitions

  • the present invention relates to a base station system for wireless communication, and more particularly to a distributed base station system.
  • DAS Distributed Antenna System
  • the system capacity is limited, and the engineering deployment cost is high, the maintenance cost is also large, and the market needs to realize the rapid and low-cost deployment indoors. Cover the system to solve the problem of indoor deep and large capacity coverage.
  • the present invention provides a distributed base station system.
  • a distributed base station system includes: a baseband unit BBU, an intermediate frequency processing unit IFU and a radio frequency front end unit RFU, a baseband unit BBU and an intermediate frequency processing unit IFU connected by an optical fiber, an intermediate frequency processing unit IFU and a radio frequency front end unit RFU connected by a power line, a radio frequency front end An antenna is integrated in the unit RFU.
  • a distributed base station system is provided, and an analog intermediate frequency signal is transmitted between the intermediate frequency processing unit IFU and the radio frequency front end unit RFU.
  • a distributed base station system is provided.
  • the intermediate frequency processing unit IFU is connected to the baseband unit BBU through an optical fiber, and at least two of the radio frequency front end units RFU are respectively connected to the intermediate frequency processing unit IFU through the same power line.
  • a distributed base station system is provided.
  • the intermediate frequency processing unit IFU is connected to a baseband unit through an optical fiber, and the intermediate frequency processing unit IFU and the at least two radio frequency front end units RFU form a star connection through different power lines.
  • a distributed base station system is provided.
  • the intermediate frequency processing unit IFU is connected to the baseband unit BBU through an optical fiber, and the intermediate frequency processing unit IFU is connected by a fiber cascade.
  • At least two RF front end units RFU are respectively connected in series with the intermediate frequency processing unit IFU. connection.
  • a distributed base station system is provided.
  • the baseband unit BBU and the intermediate frequency processing unit IFU are connected by different fiber stars, and at least two radio frequency front end units RFU are respectively connected in series with the intermediate frequency processing unit IFU.
  • a distributed base station system is provided.
  • the intermediate frequency processing unit IFU supports multiple pairs of power line interfaces, and the intermediate frequency processing unit IFU supports uplink and downlink processing of multiple baseband signals.
  • the intermediate frequency processing unit IFU is an intermediate frequency processing unit IFU with a duplex filter, and includes:
  • the downlink signal processing unit receives the data sent from the baseband unit BBU through the optical fiber to obtain the I-channel in-phase signal and the Q-channel quadrature signal, and the I-channel in-phase signal and the Q-channel quadrature signal are digitally upconverted.
  • the processing module DUC becomes a digital intermediate frequency signal, and the digital intermediate frequency signal becomes an analog intermediate frequency signal through a digital-to-analog conversion mode DAC block, and the analog intermediate frequency signal is modulated into a differential analog intermediate frequency signal by a modulation module, and the differential analog intermediate frequency signal is amplified by a differential amplifier, and the amplified
  • the differential analog IF signal is output through a duplex filter and coupled through a coupler to two power lines for transmission;
  • the uplink signal processing unit, the intermediate frequency processing unit IFU receives the differential analog intermediate frequency signal from the power line through the coupler, and the differential analog intermediate frequency signal is converted into the required uplink analog intermediate frequency signal by the duplex filter; the uplink analog intermediate frequency signal passes through the variable gain attenuator And differential amplifier processing, the amplified differential analog IF signal becomes a non-differential analog IF signal through the demodulation module, and is converted into a digital intermediate frequency signal by an analog-to-digital conversion module ADC, and the digital intermediate frequency signal is converted into an IQ baseband signal by the digital down conversion module DDC. And transmitting to the baseband unit BBU on the optical fiber through the IQ baseband data transceiving processing module.
  • the intermediate frequency processing unit IFU is an intermediate frequency processing unit IFU with a band pass filter, and includes:
  • the downlink signal processing unit receives the data sent from the baseband unit BBU through the optical fiber to obtain the I-channel in-phase signal and the Q-channel quadrature signal, and the I-channel in-phase signal and the Q-channel quadrature signal pass through the digital up-conversion module DUC.
  • Processing becomes a digital intermediate frequency signal, and the digital intermediate frequency signal passes through a digital to analog conversion module
  • the DAC processing becomes an analog intermediate frequency signal, and the analog intermediate frequency signal is modulated into a differential analog intermediate frequency signal by a modulation module, and the differential analog intermediate frequency signal is amplified by a differential amplifier, and the amplified differential analog intermediate frequency signal is directly coupled to the two power lines through a coupler for transmission;
  • the uplink signal processing unit, the intermediate frequency processing unit IFU receives the differential analog intermediate frequency signal from the power line through the coupler, and the differential analog intermediate frequency signal becomes the required uplink analog intermediate frequency signal through the band pass filter; the uplink analog intermediate frequency signal passes the variable gain attenuator And differential amplifier processing, the amplified differential analog IF signal becomes a non-differential analog IF signal through the demodulation module, and is converted into a digital intermediate frequency signal by an analog-to-digital conversion module ADC, and the digital intermediate frequency signal is converted into an IQ baseband signal by the digital down conversion module DDC. And transmitting to the baseband unit BBU on the optical fiber through the IQ baseband data transceiving processing module.
  • a distributed base station system is provided, the RF front end unit RFU including a power supply module for providing a power supply.
  • the RF front-end unit RFU is an RF front-end unit RFU with a duplex filter, and includes:
  • the downlink signal processing unit receives the differential analog intermediate frequency signal from the power line through the coupler, and the differential analog intermediate frequency signal becomes a downlink analog intermediate frequency signal through the duplex filter; the downlink analog intermediate frequency signal is processed by the variable gain attenuator and the differential amplifier, and the downlink The analog IF signal is converted into an RF signal by the up-conversion module, and the RF signal is amplified by the power amplification module PA, and finally transmitted to the built-in antenna through the duplex filter;
  • the uplink signal processing unit receives the uplink signal through the built-in antenna, and the uplink signal is processed by the duplexer filter, and then amplified by the low-noise module LNA, and the amplified RF signal is converted into a differential analog intermediate frequency signal by differential conversion, and the differential analog intermediate frequency signal is Amplified by a differential amplifier, the amplified differential analog IF signal is output through a duplex filter and coupled through a coupler to two power lines for transmission.
  • the RF front end unit RFU is an RF front end unit RFU with a band pass filter, and includes:
  • the downlink signal processing unit receives the differential analog intermediate frequency signal from the power line through the coupler, and the differential analog intermediate frequency signal becomes a downlink analog intermediate frequency signal through the band pass filter; the downlink analog intermediate frequency signal is processed by the variable gain attenuator and the differential amplifier, and the downlink The analog IF signal is converted into an RF signal by the up-conversion module, and the RF signal is amplified by the power amplification module PA, and finally transmitted to the built-in antenna through the duplex filter;
  • the uplink signal processing unit receives the uplink signal through the built-in antenna, and the uplink signal passes through the duplexer filter
  • the wave device is processed and then amplified by the low-noise module LNA.
  • the amplified RF signal is converted into a differential analog intermediate frequency signal by down-conversion, and the differential analog intermediate frequency signal is amplified by a differential amplifier.
  • the amplified differential analog intermediate frequency signal is directly coupled to the two through the coupler. Transmission on the root power line.
  • the present invention overcomes the defects of the current indoor distributed antenna system, such as small capacity, high engineering deployment cost, and high maintenance cost, and can achieve indoor wireless signal coverage, low engineering deployment cost, low maintenance cost, and system capacity. High benefits.
  • FIG. 1 is a schematic structural diagram of a distributed base station system according to the present invention.
  • FIG. 2 is a schematic diagram of the internal portion of an intermediate frequency processing unit IFU according to the present invention.
  • FIG. 3 is a schematic diagram of the internal portion of an intermediate frequency processing unit IFU with a duplex filter according to the present invention
  • FIG. 4 is a schematic diagram of the internal portion of an intermediate frequency processing unit IFU with a band pass filter according to the present invention
  • FIG. 5 is a schematic diagram of internal functions of an RFU front-end unit RFU with a duplex filter according to the present invention
  • FIG. 6 is a schematic diagram showing the internal functions of an RF front-end unit RFU with a band pass filter according to the present invention
  • FIG. 7 is a schematic diagram of a plurality of RF front-end unit RFUs connected to the same power line network according to the present invention.
  • FIG. 8 is a schematic diagram of a star network between an intermediate frequency processing unit IFU and a radio frequency front end unit RFU;
  • FIG. 9 is a schematic diagram of a cascaded networking between intermediate frequency processing units IFU according to the present invention.
  • FIG. 10 is a schematic diagram of a star network between a baseband unit BBU and an intermediate frequency processing unit IFU according to the present invention.
  • a distributed base station system includes: a baseband unit BBU100, an intermediate frequency processing unit IFU200, and a radio frequency front end unit RFU300.
  • the baseband unit BBU and the intermediate frequency processing unit IFU are connected by optical fibers, and the intermediate frequency processing is performed.
  • the unit IFU is connected to the RF front-end unit RFU through a power line, and an antenna is disposed in the RF front-end unit RFU, and the antenna is integrated in the RF front-end unit RFU.
  • the IQ baseband signal of the present invention refers to a lower frequency signal that is not modulated, the I/Q signal is divided into an analog I/Q signal and a digital I/Q signal, and the I channel signal refers to an I channel in-phase signal, Q
  • the road signal refers to the Q-channel orthogonal signal.
  • FIG. 4 are internal schematic diagrams of two embodiments of an intermediate frequency processing unit IFU
  • the IQ baseband data transceiving processing module receives the IQ data transmitted from the baseband unit BBU through the optical fiber to obtain an I-channel in-phase signal and a Q-channel.
  • the quadrature signal, the I-channel in-phase signal and the Q-channel quadrature signal are converted into a digital intermediate frequency signal by digital up-conversion processing (DUC), and then the digital intermediate frequency signal is converted into an analog intermediate frequency signal by a digital-to-analog conversion processing (DAC) to simulate an intermediate frequency signal.
  • DUC digital up-conversion processing
  • DAC digital-to-analog conversion processing
  • the differential analog IF signal is modulated by the IQ modulation module, and the differential analog IF signal is amplified by a differential amplifier.
  • the amplified differential analog IF signal is output through a duplex filter and then coupled to the two power lines through a coupler for transmission.
  • the intermediate frequency processing unit IFU receives the differential analog intermediate frequency signal from the power line through the coupler, and the differential analog intermediate frequency signal can be converted into the required uplink analog intermediate frequency signal through the duplex filter.
  • the uplink analog IF signal is processed by a variable gain attenuator and a differential amplifier, and the amplified differential analog IF signal is converted into a non-differential analog IF signal by an IQ demodulation module, and then converted into a digital intermediate frequency signal by an ADC analog to digital IF signal.
  • the digital downconverted DDC becomes an IQ baseband signal and is then transmitted over the fiber to the baseband unit via the I/Q baseband data transceiving processing module.
  • the IQ baseband data transceiving processing module receives the IQ data sent from the baseband unit BBU through the optical fiber to obtain the I in-phase signal and the Q path.
  • the quadrature signal, the I-channel in-phase signal and the Q-channel quadrature signal are converted into digital intermediate frequency signals by digital up-conversion processing (DUC), and then the digital intermediate frequency signal is converted into an analog intermediate frequency signal by DAC digital-to-analog conversion, and the analog intermediate frequency signal is modulated by IQ.
  • DUC digital up-conversion processing
  • Module modulation into differential analog IF signal in differential simulation
  • the frequency signal is amplified by a differential amplifier, and the amplified differential analog intermediate frequency signal is directly coupled to a pair (two) power lines through a coupler.
  • the intermediate frequency processing unit IFU receives the differential analog intermediate frequency signal from the power line through the coupler, and the differential analog intermediate frequency signal becomes the required uplink analog intermediate frequency signal through the band pass filter.
  • the uplink analog IF signal is processed by a variable gain attenuator and a differential amplifier, and the amplified differential analog IF signal is converted into a non-differential analog IF signal by an IQ demodulation module, and then converted into a digital intermediate frequency signal by an ADC analog to digital IF signal.
  • the digital down conversion processing (DDC) becomes an IQ baseband signal, which is then transmitted to the baseband unit BBU on the optical fiber through the I/Q baseband data transceiving processing module.
  • FIG. 5 and FIG. 6 are schematic diagrams showing two internal implementations of the RFU front-end unit RFU in the present invention.
  • FIG. 5 is a schematic diagram of the internal function of the RFU front-end unit RFU with a duplex filter.
  • the RF front-end unit RFU internally obtains the power supply through the power line.
  • a differential analog intermediate frequency signal is received from the power line through the coupler, and the differential analog intermediate frequency signal is converted into a desired downlink analog intermediate frequency signal by a duplex filter.
  • the downlink analog IF signal is processed by the variable gain attenuator and the differential amplifier, and the downlink analog IF signal is converted into an RF signal by up-conversion, the RF signal is amplified by the power amplifier PA, and finally transmitted to the built-in antenna through the duplex filter.
  • the uplink signal is received through the built-in antenna, the uplink signal is processed by the duplexer filter, and then amplified by the low-noise amplifier LNA, and the amplified RF signal is converted into a differential analog intermediate frequency signal by differential down conversion, and the differential analog intermediate frequency is
  • the signal is amplified by a differential amplifier, and the amplified differential analog IF signal can be output through a duplex filter and then coupled through a coupler to two power lines for transmission.
  • FIG. 6 is a schematic diagram of the internal function of the RFU front end unit RFU with a band pass filter according to the present invention.
  • the RF front end unit RFU internally obtains the power supply through the power line.
  • a differential analog intermediate frequency signal is received from the power line through the coupler, and the differential analog intermediate frequency signal is converted into a desired downlink analog intermediate frequency signal by a band pass filter. Then, the downlink analog IF signal is processed by the variable gain attenuator and the differential amplifier, and the downlink analog IF signal is converted into an RF signal by up-conversion, the RF signal is amplified by the power amplifier PA, and finally transmitted to the built-in antenna through the duplex filter.
  • the uplink signal is received through the built-in antenna, the uplink signal is processed by the duplexer filter, and then amplified by the low-noise amplifier LNA, and the amplified RF signal is converted into a differential analog intermediate frequency signal by differential down conversion, and the differential analog intermediate frequency is
  • the signal is amplified by a differential amplifier, and the amplified differential analog IF signal can also be directly coupled to the two power lines via a coupler for transmission.
  • FIG. 7, FIG. 8, FIG. 9 and FIG. 10 are baseband units BBU and intermediate frequency of indoor coverage distributed base station system Different networking modes between the IFU and the RF front-end unit RFU.
  • FIG. 7 is a schematic diagram of a plurality of RF front-end unit RFUs connected to the same power line network, the intermediate frequency processing unit IFU and the RF front-end unit RFU are connected by a power line, the RF front-end unit RFU is integrated with an antenna, and the RF front-end unit RFU is internally passed through the power line. Get the power supply.
  • the RF front-end unit RFU is connected to the same power line, and the power line transmits an analog intermediate frequency signal, not a digital signal.
  • the intermediate frequency processing unit IFU IF processing unit IFU supports uplink and downlink processing of multiple IQ baseband signals, and supports multiple pairs of power line interfaces IFU. Connect to multiple RF front-end units RFURFU via a star connection.
  • the intermediate frequency processing unit IFU and the RF front-end unit RFU are connected by a power line, and the antenna is integrated in the RF front-end unit RFU, and the RF front-end unit RFU internally obtains the power supply through the power line.
  • the RF front-end unit RFU is connected to different power lines, and the power line transmits an analog intermediate frequency signal, not a digital signal.
  • FIG. 9 is a schematic diagram of a cascaded networking between intermediate frequency processing units IFU according to the present invention.
  • different intermediate frequency processing units IFU are connected through a fiber medium.
  • FIG. 10 is a schematic diagram of a star network between a baseband unit BBU and an intermediate frequency processing unit IFUIFU, wherein the BBU completes the uplink and downlink baseband signal processing of the 2G/3G/4G/5G, and the baseband unit BBU passes the optical fiber transmission medium and the intermediate frequency processing unit IFU.
  • the connection, the baseband unit BBU and the intermediate frequency processing unit IFU follow a CPRI (Common Public Radio Interface) common public radio interface.
  • CPRI Common Public Radio Interface
  • different intermediate frequency processing units IFU are connected to the baseband unit BBU via a fiber medium.
  • the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better.
  • Implementation Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for causing a A terminal device (which may be a cell phone, a computer, a server, an air conditioner, or a network device, etc.) performs the methods described in various embodiments of the present invention.
  • a terminal device which may be a cell phone, a computer, a server, an air conditioner, or a network device, etc.
  • the present invention relates to the field of mobile communication technologies, and in particular, to the field of networking technologies for providing wireless indoor coverage.
  • the present invention provides a distributed base station system including a baseband unit BBU, an intermediate frequency processing unit IFU, and a radio frequency front end unit RFU, wherein the baseband unit BBU and the intermediate frequency processing unit IFU are connected by optical fibers, and the intermediate frequency is
  • the IFU is connected to the RF front-end unit RFU through a power line, and an antenna is integrated in the RF front-end unit RFU.
  • the distributed base station system can overcome the defects of the current indoor distributed antenna system, such as small capacity, high engineering deployment cost, and high maintenance cost, and can achieve indoor wireless signal coverage, low engineering deployment cost, low maintenance cost, and high system capacity. The benefits.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Optical Communication System (AREA)

Abstract

本发明公开了一种分布式基站系统，包括：基带单元BBU，中频处理单元IFU和射频前端单元RFU，基带单元BBU与中频处理单元IFU通过光纤传连接，中频处理单元IFU与射频前端单元RFU通过电力线连接，射频前端单元RFU内集成有天线。本发明克服了当前分布式基站系统容量小、工程部署成本高、维护成本高的缺陷，达到了可以快速实现室内无线信号覆盖，工程部署成本低、维护成本低、系统容量高的有益效果。 (图1)

Description

一种分布式基站系统
本申请基于申请号为CN201610281607.0、申请日为2016年4月29日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及一种无线通信的基站系统，更确切地说是一种分布式基站系统。
背景技术
近年移动宽带业务发展迅猛，各种制式智能终端(手机、数据卡、iPad等)的数据业务井喷式发展，导致热点地区数据流量以及各种基于移动互联网应用的APP应用呈现爆炸式增长趋势，尤其在室内热点区域，例如商场、写字楼、酒店、购物中心、影院、比赛场馆、机场、火车站、地铁的地方，数据流量更是呈指数级增长态势，现有的设施势必影响到这些室内热点区域的用户的3G/4G/5G数据服务体验。
目前，在室内覆盖组网系统中，多为DAS(Distributed Antenna System)分布式天线系统应用，系统容量有限，而且工程部署成本高，维护成本也大，市场上非常需要实现快速低成本地部署室内覆盖系统，解决室内深度大容量覆盖的诉求。
发明内容
针对上述缺陷，本发明提供了一种分布式基站系统。
一种分布式基站系统，包括：基带单元BBU,中频处理单元IFU和射频前端单元RFU，基带单元BBU与中频处理单元IFU通过光纤连接，中频处理单元IFU与射频前端单元RFU通过电力线连接，射频前端单元RFU内集成有天线。
提供一种分布式基站系统，所述中频处理单元IFU与射频前端单元RFU之间传输的是模拟中频信号。
提供一种分布式基站系统，所述中频处理单元IFU通过光纤与基带单元BBU连接，至少两个所述射频前端单元RFU通过相同电力线分别与中频处理单元IFU连接。
提供一种分布式基站系统，所述中频处理单元IFU通过光纤与基带单元连接，所述中频处理单元IFU与至少两个射频前端单元RFU通过不同电力线形成星形连接。
提供一种分布式基站系统，所述中频处理单元IFU通过光纤与基带单元BBU连接，中频处理单元IFU之间通过光纤级联连接，至少两个射频前端单元RFU分别与所述中频处理单元IFU串联连接。
提供一种分布式基站系统，所述基带单元BBU与述中频处理单元IFU之间通过不同光纤星形连接，至少两个射频前端单元RFU分别与所述中频处理单元IFU串联连接。
提供一种分布式基站系统，所述中频处理单元IFU支持多对电源线接口，所述的中频处理单元IFU支持多路基带信号的上下行处理。
提供一种分布式基站系统，所述中频处理单元IFU为带双工滤波器中频处理单元IFU，包括：
下行信号处理单元，基带数据收发处理模块通过光纤接收来自所述基带单元BBU发送的数据获得I路同相信号和Q路正交信号，I路同相信号和Q路正交信号经过数字上变频处理模块DUC变为数字中频信号，数字中频信号通过数模转换模DAC块变成模拟中频信号，模拟中频信号通过调制模块调制为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号通过双工滤波器输出，通过耦合器耦合到两根电力线上传输；
上行信号处理单元，中频处理单元IFU通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过双工滤波器转成所需上行模拟中频信号；上行模拟中频信号通过可变增益衰减器和差分放大器处理，放大后的差分模拟中频信号通过解调模块变成非差分模拟中频信号，通过模数转换模块ADC转换为数字中频信号，数字中频信号经过数字下变频模块DDC转为IQ基带信号，通过IQ基带数据收发处理模块在光纤上发送给基带单元BBU。
提供一种分布式基站系统，所述中频处理单元IFU为带带通滤波器的中频处理单元IFU，包括：
下行信号处理单元，基带数据收发处理模块通过光纤接收来自基带单元BBU发送的数据获得I路同相信号和Q路正交信号，I路同相信号和Q路正交信号经过数字上变频模块DUC处理变为数字中频信号，数字中频信号通过数模转换模块 DAC处理变成模拟中频信号，模拟中频信号通过调制模块调制为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号直接通过耦合器耦合到两根电力线上传输；
上行信号处理单元，中频处理单元IFU通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过带通滤波器变成所需上行模拟中频信号；上行模拟中频信号通过可变增益衰减器和差分放大器处理，放大后的差分模拟中频信号通过解调模块变成非差分模拟中频信号，通过模数转换模块ADC转换为数字中频信号，数字中频信号经过数字下变频模块DDC转为IQ基带信号，通过IQ基带数据收发处理模块在光纤上发送给基带单元BBU。
提供一种分布式基站系统，所述射频前端单元RFU包括用于提供供电电源的电源模块。
提供一种分布式基站系统，所述射频前端单元RFU为带双工滤波器的射频前端单元RFU，包括：
下行信号处理单元，通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过双工滤波器变成下行模拟中频信号；下行模拟中频信号通过可变增益衰减器和差分放大器处理，下行模拟中频信号通过上变频模块变为射频信号，射频信号通过功率放大模块PA进行放大,最后通过双工滤波器发送到内置的天线上；
上行信号处理单元，通过内置的天线接收上行信号，上行信号经过双工器滤波器处理，然后经过低噪模块LNA放大处理，放大的射频信号经过下变频变为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号通过双工滤波器输出，通过耦合器耦合到两根电力线上传输。
提供一种分布式基站系统，所述射频前端单元RFU为带带通滤波器的射频前端单元RFU，包括：
下行信号处理单元，通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过带通滤波器变成下行模拟中频信号；下行模拟中频信号通过可变增益衰减器和差分放大器处理，下行模拟中频信号通过上变频模块变为射频信号，射频信号通过功率放大模块PA进行放大,最后通过双工滤波器发送到内置的天线上；
上行信号处理单元，通过内置的天线接收上行信号，上行信号经过双工器滤 波器处理，然后经过低噪模块LNA放大处理，放大的射频信号经过下变频变为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号直接通过耦合器耦合到两根电力线上传输。
本发明对照现有技术，克服了当前室内分布式天线系统容量小、工程部署成本高、维护成本高的缺陷，达到了可以快速实现室内无线信号覆盖，工程部署成本低、维护成本低、系统容量高的有益效果。
附图说明
图1为本发明分布式基站系统总体结构示意图；
图2为本发明中频处理单元IFU内部示意图；
图3为本发明带双工滤波器的中频处理单元IFU内部示意图；
图4为本发明带带通滤波器的中频处理单元IFU内部示意图；
图5为本发明带双工滤波器的射频前端单元RFU内部功能示意图；
图6为本发明带带通滤波器的射频前端单元RFU内部功能示意图；
图7为本发明多个射频前端单元RFU连接到相同电源线组网示意图；
图8为本发明中频处理单元IFU与射频前端单元RFU之间的星型组网示意图；
图9为本发明中频处理单元IFU之间级联组网示意图；
图10为本发明基带单元BBU与中频处理单元IFU之间星型组网示意图。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
现在将参考附图描述实现本发明各个实施例的移动终端。在后续的描述中，使用用于表示元件的诸如“模块”、“部件”或“单元”的后缀仅为了有利于本发明的说明，其本身并没有特定的意义。因此，"模块"与"部件"可以混合地使用。
下面结合图1-10对本发明进行详细的介绍：
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包 括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
图1为本发明分布式基站系统总体结构示意图，一种分布式基站系统，包括：基带单元BBU100、中频处理单元IFU200、射频前端单元RFU300，基带单元BBU与中频处理单元IFU通过光纤连接，中频处理单元IFU与射频前端单元RFU通过电力线连接，射频前端单元RFU内设有天线，所述天线集成在射频前端单元RFU内。
图2为本发明中频处理单元IFU内部示意图，中频处理单元IFU支持多路IQ基带信号的上下行处理，支持多对电源线接口，下面以一路IQ基带信号数字上下行变频处理、AD模数转换、DA数模转换、模拟中频信号滤波、模拟信号耦合处理等进行说明。本发明所述IQ基带信号，是指没有经过调制的、频率较低信号，I/Q信号分为模拟I/Q信号和数字I/Q信号，I路信号是指I路同相信号，Q路信号是指Q路正交信号。
图3和图4是中频处理单元IFU两种实施方式内部示意图
图3为本发明带双工滤波器的中频处理单元IFU内部示意图，在下行信号处理方向，IQ基带数据收发处理模块通过光纤接收来自基带单元BBU发送的IQ数据获得I路同相信号和Q路正交信号，I路同相信号和Q路正交信号经过数字上变频处理(DUC)变为数字中频信号，然后数字中频信号通过数模转换处理(DAC)变成模拟中频信号，模拟中频信号通过IQ调制模块调制为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号通过双工滤波器输出，然后通过耦合器耦合到两根电力线上传输。
在上行信号处理方向，中频处理单元IFU通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号可以通过双工滤波器变成所需上行模拟中频信号。上行模拟中频信号通过可变增益衰减器和差分放大器处理，放大后的差分模拟中频信号通过IQ解调模块变成非差分模拟中频信号，然后通过ADC模数转换为数字中频信号，数字中频信号经过数字下变频DDC变成IQ基带信号，然后通过I/Q基带数据收发处理模块在光纤上发送给基带单元。
图4为本发明带带通滤波器的中频处理单元IFU内部示意图，在下行信号处理方向，IQ基带数据收发处理模块通过光纤接收来自基带单元BBU发送的IQ数据获得I路同相信号和Q路正交信号，I路同相信号和Q路正交信号经过数字上变频处理(DUC)变为数字中频信号，然后数字中频信号通过DAC数模转换变成模拟中频信号，模拟中频信号通过IQ调制模块调制为差分模拟中频信号，差分模拟中 频信号通过差分放大器放大，放大后的差分模拟中频信号直接通过耦合器耦合到一对(两根)电力线上传输。
在上行信号处理方向，中频处理单元IFU通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过带通滤波器变成所需上行模拟中频信号。上行模拟中频信号通过可变增益衰减器和差分放大器处理，放大后的差分模拟中频信号通过IQ解调模块变成非差分模拟中频信号，然后通过ADC模数转换为数字中频信号，数字中频信号经过数字下变频处理(DDC)变成IQ基带信号，然后通过I/Q基带数据收发处理模块在光纤上发送给基带单元BBU。
图5和图6为本发明射频前端单元RFU内部功能两种实施方式示意图
图5为本发明带双工滤波器的射频前端单元RFU内部功能示意图，射频前端单元RFU内部通过电力线上获取供电电源。
在下行信号处理方向，通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过双工滤波器变成所需下行模拟中频信号。然后下行模拟中频信号通过可变增益衰减器和差分放大器处理，下行模拟中频信号通过上变频变为射频信号，射频信号通过功率放大器PA进行放大,最后通过双工滤波器发送到内置的天线上。
在上行信号方面，通过内置的天线上接收上行信号，上行信号经过双工器滤波器处理，然后经过低噪放大器LNA放大处理，放大的射频信号经过下变频变为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号可以通过双工滤波器输出，然后通过耦合器耦合到两根电力线上传输。
图6为本发明带带通滤波器的射频前端单元RFU内部功能示意图，射频前端单元RFU内部通过电力线上获取供电电源。
在下行信号处理方向，通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过带通滤波器变成所需下行模拟中频信号。然后下行模拟中频信号通过可变增益衰减器和差分放大器处理，下行模拟中频信号通过上变频变为射频信号，射频信号通过功率放大器PA进行放大,最后通过双工滤波器发送到内置的天线上。
在上行信号方面，通过内置的天线上接收上行信号，上行信号经过双工器滤波器处理，然后经过低噪放大器LNA放大处理，放大的射频信号经过下变频变为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号也可以直接通过耦合器耦合到两根电力线上传输。
图7，图8，图9和图10是室内覆盖分布式基站系统基带单元BBU、中频处 理单元IFU、射频前端单元RFU之间的不同组网方式。
图7为本发明多个射频前端单元RFU连接到相同电源线组网示意图，中频处理单元IFU与射频前端单元RFU通过电力线连接，射频前端单元RFU内集成了天线，射频前端单元RFU内部通过电力线上获取供电电源。本实施方式中射频前端单元RFU与相同的电力线相连，电力线传输的是模拟中频信号，不是数字信号。
图8为本发明中频处理单元IFU与射频前端单元RFU之间的星型组网示意图，中频处理单元IFU中频处理单元IFU支持多路IQ基带信号的上下行处理，支持多对电源线接口IFU可以通过星型连接方式与多个射频前端单元RFURFU连接。中频处理单元IFU与射频前端单元RFU通过电力线连接，射频前端单元RFU内集成了天线，射频前端单元RFU内部通过电力线上获取供电电源。本实施方式中射频前端单元RFU与不同的电力线相连，电力线传输的是模拟中频信号，不是数字信号。
图9为本发明中频处理单元IFU之间级联组网示意图，本实施方式中，不同的中频处理单元IFU通过光纤介质相连接。
图10为本发明基带单元BBU与中频处理单元IFUIFU之间星型组网示意图，其中BBU完成2G/3G/4G/5G的上下行基带信号处理，基带单元BBU通过光纤传输介质与中频处理单元IFU连接，基带单元BBU与中频处理单元IFU之间遵循CPRI(Common Public Radio Interface)通用公共无线电接口。本实施方式中，不同的中频处理单元IFU通过光纤介质与基带单元BBU连接。
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本发明各个实施例所述的方法。
工业实用性
本发明涉及移动通信技术领域，尤其涉及提供无线室内覆盖的组网技术领域。本发明提供一种包括基带单元BBU、中频处理单元IFU和射频前端单元RFU的分布式基站系统，其中，基带单元BBU与中频处理单元IFU通过光纤连接，中频处 理单元IFU与射频前端单元RFU通过电力线连接，射频前端单元RFU内集成有天线。通过该分布式基站系统可以克服当前室内分布式天线系统容量小、工程部署成本高、维护成本高的缺陷，达到了可以快速实现室内无线信号覆盖，工程部署成本低、维护成本低、系统容量高的有益效果。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (12)

  1. 一种分布式基站系统，其中所述系统包括：基带单元BBU，中频处理单元IFU和射频前端单元RFU，基带单元BBU与中频处理单元IFU通过光纤连接，中频处理单元IFU与射频前端单元RFU通过电力线连接，射频前端单元RFU内集成有天线。
  2. 根据权利要求1所述的分布式基站系统，其中，所述中频处理单元IFU与射频前端单元RFU之间传输的是模拟中频信号。
  3. 根据权利要求1或2所述的分布式基站系统，其中，所述中频处理单元IFU通过光纤与基带单元BBU连接，至少两个所述射频前端单元RFU通过相同电力线分别与中频处理单元IFU连接。
  4. 根据权利要求1或2所述的分布式基站系统，其中，所述中频处理单元IFU通过光纤与基带单元连接，所述中频处理单元IFU与至少两个射频前端单元RFU通过不同电力线形成星形连接。
  5. 根据权利要求1或2所述的分布式基站系统，其中，所述中频处理单元IFU通过光纤与基带单元BBU连接，中频处理单元IFU之间通过光纤级联连接，至少两个射频前端单元RFU分别与所述中频处理单元IFU串联连接。
  6. 根据权利要求1或2所述的分布式基站系统，其中，所述基带单元BBU与述中频处理单元IFU之间通过不同光纤星形连接，至少两个射频前端单元RFU分别与所述中频处理单元IFU串联连接。
  7. 根据权利要求1或2所述的分布式基站系统，其中，所述中频处理单元IFU支持多对电源线接口，所述的中频处理单元IFU支持多路基带信号的上下行处理。
  8. 根据权利要求1所述的分布式基站系统，其中，所述中频处理单元IFU为含双工滤波器中频处理单元IFU，包括：
    下行信号处理单元，通过基带数据收发处理模块借助光纤接收来自所述基带单元BBU发送的数据获得I路同相信号和Q路正交信号，I路同相信号和Q路正交信号经过数字上变频处理模块DUC变为数字中频信号，数字中频信号通过数模转换模块DAC变成模拟中频信号，模拟中频信号通过调制模块调制为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号通过双工滤波器输出，通过耦合器耦合到电力线上传输；
    上行信号处理单元，通过中频处理单元IFU借助耦合器从电力线上接收到差 分模拟中频信号，差分模拟中频信号通过双工滤波器转成所需上行模拟中频信号；上行模拟中频信号通过可变增益衰减器和差分放大器处理，放大后的差分模拟中频信号通过解调模块变成非差分模拟中频信号，通过模数转换模块ADC转换为数字中频信号，数字中频信号经过数字下变频模块DDC转为IQ基带信号，通过IQ基带数据收发处理模块在光纤上发送给基带单元BBU。
  9. 根据权利要求1所述的分布式基站系统，其中，所述中频处理单元IFU为含带通滤波器的中频处理单元IFU，包括：
    下行信号处理单元，通过基带数据收发处理模块借助光纤接收来自基带单元BBU发送的数据获得I路同相信号和Q路正交信号，I路同相信号和Q路正交信号经过数字上变频模块DUC处理变为数字中频信号，数字中频信号通过数模转换模块DAC处理变成模拟中频信号，模拟中频信号通过调制模块调制为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号直接通过耦合器耦合到电力线上传输；
    上行信号处理单元，通过中频处理单元IFU借助耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过带通滤波器变成所需上行模拟中频信号；上行模拟中频信号通过可变增益衰减器和差分放大器处理，放大后的差分模拟中频信号通过解调模块变成非差分模拟中频信号，通过模数转换模块ADC转换为数字中频信号，数字中频信号经过数字下变频模块DDC转为IQ基带信号，通过IQ基带数据收发处理模块在光纤上发送给基带单元BBU。
  10. 根据权利要求1所述的分布式基站系统，其中，所述射频前端单元RFU包括设置为提供供电电源的电源模块。
  11. 根据权利要求1所述的分布式基站系统，其中，所述射频前端单元RFU为含双工滤波器的射频前端单元RFU，包括：
    下行信号处理单元，通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过双工滤波器变成下行模拟中频信号；下行模拟中频信号通过可变增益衰减器和差分放大器处理，下行模拟中频信号通过上变频模块变为射频信号，射频信号通过功率放大模块PA进行放大,最后通过双工滤波器发送到内置的天线上；
    上行信号处理单元，通过内置的天线接收上行信号，上行信号经过双工器滤波器处理，然后经过低噪模块LNA放大处理，放大的射频信号经过下变频变为差 分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号通过双工滤波器输出，通过耦合器耦合到电力线上传输。
  12. 根据权利要求1所述的分布式基站系统，其中，所述射频前端单元RFU为含带通滤波器的射频前端单元RFU，包括：
    下行信号处理单元，通过耦合器从电力线上接收到差分模拟中频信号，差分模拟中频信号通过带通滤波器变成下行模拟中频信号；下行模拟中频信号通过可变增益衰减器和差分放大器处理，下行模拟中频信号通过上变频模块变为射频信号，射频信号通过功率放大模块PA进行放大,最后通过双工滤波器发送到内置的天线上；
    上行信号处理单元，通过内置的天线接收上行信号，上行信号经过双工器滤波器处理，然后经过低噪模块LNA放大处理，放大的射频信号经过下变频变为差分模拟中频信号，差分模拟中频信号通过差分放大器放大，放大后的差分模拟中频信号直接通过耦合器耦合到两根电力线上传输。
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