WO2018107431A1 - 射频拉远装置及时分双工系统 - Google Patents

射频拉远装置及时分双工系统 Download PDF

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Publication number
WO2018107431A1
WO2018107431A1 PCT/CN2016/110091 CN2016110091W WO2018107431A1 WO 2018107431 A1 WO2018107431 A1 WO 2018107431A1 CN 2016110091 W CN2016110091 W CN 2016110091W WO 2018107431 A1 WO2018107431 A1 WO 2018107431A1
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link
switch
remote device
unit
transmit
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English (en)
French (fr)
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杜建雄
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Hytera Communications Corp Ltd
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Hytera Communications Corp Ltd
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Priority to PCT/CN2016/110091 priority Critical patent/WO2018107431A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a radio frequency remote device and a time division duplex system.
  • the existing RDU (Radio Remote Unit) of the TDD (Time Division Duplexing) system adopts the traditional 2-channel implementation, wherein the RRU includes two TX (Transmit Channel) channels and two RX (Reciever Channel) channel and an FB (FeedBack) channel.
  • the RRU samples the output signal of the TX channel through the FB channel for DPD (Digital Pre-Distortion) correction, and the RX channel is idle.
  • the FB channel is idle. Therefore, during the RRU switching process, one of the FB channel and the RX channel is idle, resulting in a decrease in utilization.
  • the technical problem to be solved by the present invention is to provide a radio frequency remote device that can be divided into duplex systems in time, and can implement feedback through the receiving link to improve link utilization.
  • a technical solution adopted by the present invention is to provide a radio frequency remote device, which is applied to a time division duplex system, and the radio remote device includes a digital intermediate frequency processing unit, a transceiver unit, a switching unit, and a power amplifying unit.
  • the transceiver unit includes at least one transmit link and at least one receive link, and the digital intermediate frequency processing unit is connected to the input end of the transmit link and the output end of the receive link, and the output end of the transmit link is connected to the power amplifying unit;
  • the input end of the receiving link is connected to the feedback end of the power amplifying unit through the switching unit; when the receiving link is working, the input end of the receiving link is connected to the power amplifying unit through the switching unit.
  • the switching unit includes at least one RF switch corresponding to the receiving link, the first end of the RF switch is connected to the input end of the corresponding receiving link, the second end of the RF switch is connected to the feedback end, and the third end of the RF switch The terminal is connected to the power amplifying unit.
  • the transmitting link works, the first end and the second end of the RF switch are connected, and the receiving chain
  • the input end of the circuit is connected to the feedback end of the power amplifying unit through the RF switch; when the receiving link is working, the first end and the third end of the RF switch are connected, and the input end of the receiving link is connected to the power amplifying unit through the RF switch.
  • the switching unit includes a first radio switch and a first corresponding to the first receiving link, when the transceiver unit includes the first transmit link, the second transmit link, the first receive link, and the second receive link.
  • a second RF switch corresponding to the receiving link; the first end of the first RF switch is connected to the input end of the first receiving link, and the second end of the first RF switch and the first end corresponding to the first transmitting link
  • the feedback end is connected, the third end of the first RF switch is connected to the power amplifying unit; the first end of the second RF switch is connected to the input end of the second receiving link, and the second end of the second RF switch and the second transmitting
  • the second feedback end corresponding to the link is connected, and the third end of the second RF switch is connected to the power amplifying unit.
  • the first end of the first RF switch is connected to the second end, and the first end of the second RF switch is connected to the second end; in the first receiving chain, when the first transmitting link and the second transmitting link are in operation When the circuit and the second receiving link are in operation, the first end of the first RF switch is connected to the third end, and the first end of the second RF switch is connected to the third end.
  • the digital intermediate frequency processing unit further includes a transmit processor and a receive/feedback processor, the transmit processor being coupled to the input of the first transmit link and the input of the second transmit link, the receive/feedback processor and the first receive The output of the link is connected to the output of the second receive link.
  • the power amplifying unit comprises a first power amplifier, a second power amplifier, a first low noise amplifier and a second low noise amplifier; the first power amplifier is connected to the output of the first transmitting link, and the second power amplifier is connected to the second transmitting An output end of the link, a first feedback end of the first power amplifier is connected to the second end of the first RF switch, and a second feedback end of the second power amplifier is connected to the second end of the second RF switch; the first low noise The amplifier is connected to the third end of the first RF switch, and the second low noise amplifier is connected to the third end of the second RF switch.
  • the radio remote device further includes a duplex filtering unit, the duplex filtering unit includes a first dual power filter and a second dual power filter, and the first dual power filter is connected to the first power amplifier and the second power amplifier.
  • the second dual power filter is coupled to the first low noise amplifier and the second low noise amplifier.
  • the radio remote device further includes a first antenna and a second antenna, the first antenna is connected to the first dual power filter, and the second antenna is connected to the second dual power filter.
  • another technical solution adopted by the present invention is to provide a time division duplex system including the above-mentioned radio remote device.
  • the present invention provides a radio remote device, including a digital intermediate frequency processing unit, a transceiver unit, a switching unit, and a power amplifying unit.
  • the transceiver unit includes at least one transmitting link and At least one receiving link, the digital intermediate frequency processing unit is connected to the input end of the transmitting link and the output end of the receiving link, and the output end of the transmitting link is connected to the power amplifying unit; when the transmitting link works, the input of the receiving link
  • the terminal is connected to the feedback end of the power amplifying unit through the switching unit; when the receiving link operates, the input end of the receiving link is connected to the power amplifying unit through the switching unit. Therefore, the radio remote device of the present invention realizes feedback through the receiving link when the transmitting link works, improves the utilization of the receiving link, reduces the volume of the radio remote device, and saves cost.
  • FIG. 1 is a schematic structural view of a radio remote device according to an embodiment of the present invention.
  • 2 is an uplink time slot ratio diagram of a TDD system according to the 3GPP protocol
  • FIG. 3 is a schematic structural view of a remote radio remote device according to another embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of a remote radio remote device according to an embodiment of the present invention.
  • the radio remote device disclosed in this embodiment is applied to a time division duplex system (TDD system).
  • TDD system a received signal and a transmitted signal are used in different time slots of the same frequency channel (ie, carrier) to ensure time separation.
  • Receive (uplink) and transmit (downlink) links are used in different time slots of the same frequency channel (ie, carrier) to ensure time separation.
  • Receive (uplink) and transmit (downlink) links The TDD system does not need a pair of frequencies, and can use various frequency resources, and is suitable for asymmetric uplink data transmission rate and downlink data transmission rate.
  • the TDD system has a ratio of uplink time slots in accordance with existing 3GPP (3 rd Generation Partnership Project, the Third Generation Partnership Project) protocol, transmitting and receiving signals can be seen TDD system is not simultaneously present .
  • 3GPP 3 rd Generation Partnership Project, the Third Generation Partnership Project
  • the radio remote device 10 of the present embodiment includes a digital intermediate frequency processing unit 11, a transceiver unit 12, a switching unit 13, a power amplifying unit 14, a duplex filtering unit 15, and an antenna 16.
  • the transceiver unit 12 includes at least one transmit link 121 and at least one receive link 122.
  • the transceiver unit 12 sets the number of transmit links 121 to be the same as the number of receive links 122.
  • the transceiver unit 12 includes one transmit link 121.
  • one receive link 122, or the transceiver unit 12 includes two transmit links 121 and two receive links 122.
  • the digital intermediate frequency processing unit 11 is connected to the input of the transmit link 121 and the output of the receive link 122, and the output of the transmit link 121 is connected to the power amplifying unit 14.
  • the transmitting link 121 When the transmitting link 121 is working, the input end of the receiving link 122 is connected to the feedback end 141 of the power amplifying unit 14 through the switching unit 13. At this time, the remote receiving device 10 implements feedback through the receiving link 122, and the receiving link 122 is paired.
  • the signal output from the transmit link 121 is sampled for correcting the predistortion algorithm; when the receive link 122 is active, the input of the receive link 122 is coupled to the power amplifying unit 14 via the switching unit 13, and the radio remote device 10 receives Link 122 receives the signal.
  • DPD Digital Pre-Distortion
  • a predistortion component In the TDD system, DPD (Digital Pre-Distortion) is equivalent to cascading through a predistortion component and a power amplifying unit 14.
  • the nonlinear distortion function is built in the digital and digital baseband signal processing chip, and the power amplification is performed.
  • the number of distortions of unit 14 is equal, but the functions are reversed.
  • the RF remote unit 10 combines two nonlinear distortion functions to achieve a high degree of linearity and distortion.
  • the key to the digital predistortion technique is that the characteristics of the power amplifying unit 14 vary with time, temperature, and bias voltage, and vary from device to device.
  • the remote radio device 10 In order to resolve the above deviation, the remote radio device 10 must use a feedback mechanism to sample the signal output from the transmit link 121 for correcting the predistortion algorithm.
  • the radio remote device 10 disclosed in this embodiment implements feedback through the receiving link 122 when the transmit link 121 is working, which can avoid additional feedback links and improve the utilization of the receive link 122.
  • the switching unit 13 includes at least one radio frequency switch 131 corresponding to the receiving link 122, that is, the radio frequency switch 131 has a one-to-one correspondence with the receiving link 122.
  • the radio remote device 10 shown in FIG. 1 is described by taking one transmitting link 121, one receiving link 122, and one radio frequency switch 131 as an example.
  • the first end 1311 of the radio frequency switch 131 and the corresponding receiving link 122 The input end is connected, the second end 1312 of the RF switch 131 is connected to the feedback end 141, and the third end 1313 of the RF switch 131 is connected to the power amplifying unit 14.
  • the first end 1311 of the RF switch 131 is connected to the second end 1312, and the input end of the receiving link 122 is connected to the feedback end 141 of the power amplifying unit 14 through the RF switch 131;
  • the RF switch 131 The first end 1311 is connected to the third end 1313, and the input end of the receiving link 122 is connected to the power amplifying unit 14 through the radio frequency switch 131.
  • the RF switch 131 can also be provided with a control terminal 1314.
  • the control terminal 1314 of the RF switch 131 is connected to the digital intermediate frequency processing unit 11.
  • the digital intermediate frequency processing unit 11 is configured to control the first end 1311 of the RF switch 131 according to the working state of the transmission link 121. It is connected to the second end 1312 or the third end 1312.
  • the duplex filtering unit 15 is connected to the power amplifying unit 14, and the antenna 16 is connected to the duplex filtering unit 15.
  • the remote radio remote device 10 can implement the receiving link 122 when the transmitting link 121 is working.
  • Feedback For example, the technical index of the receiving link 122 may be: gain 22dB, wideband 20M, NF (noise coefficient) ⁇ 15dB; and the technical specifications required for feedback are: gain -16dB, wideband 100M, NF ⁇ 44dB.
  • the bandwidth of the receive link 122 is less than the bandwidth required for feedback, the bandwidth of the receive link 122 is set to 100M; the NF of the receive link 122 is less than the NF required for feedback. Therefore, the technical index of the receiving link 122 is set to a gain of 22 dB, a bandwidth of 100 M, and NF ⁇ 15 dB to meet the technical specifications required for feedback.
  • the remote radio remote device 10 of the present embodiment implements feedback through the receiving link 122 when the transmitting link 121 operates, because the technical index of the receiving link 122 is superior to the technical index required by the feedback. Therefore, the technical specifications of the radio remote device 10 of the present embodiment are superior.
  • the radio remote device 10 of the present embodiment saves the FB channel, the radio frequency link is reduced by 1/5, the corresponding PCB is reduced by 1/10, the volume of the radio remote device 10 is reduced by 1/10, and the cost is reduced by about 15%. The volume of the remote radio device 10 is reduced, the cost is saved, and the competitiveness of the product is improved.
  • the present invention further provides a radio remote device according to another embodiment.
  • the radio remote device 30 disclosed in this embodiment takes two transmit links, two receive links, and two radio switches as examples. Be explained.
  • the transceiver unit 32 includes a first transmit link 321, a second transmit link 322, a first receive link 323, and a second receive link 324.
  • the switch unit 33 includes a first RF switch that is disposed corresponding to the first receive link 323. 331 and a second RF switch corresponding to the second receiving link 324 332.
  • the first end of the first RF switch 331 is connected to the input end of the first receiving link 323, and the second end of the first RF switch 331 is connected to the first feedback end 341 corresponding to the first transmit link 321
  • the third end of the switch 331 is connected to the power amplifying unit 34.
  • the first end of the second RF switch 332 is connected to the input end of the second receiving link 324, the second end of the second RF switch 332 is connected to the second feedback end 342 corresponding to the second transmit link 322, and the second RF
  • the third end of the switch 332 is connected to the power amplifying unit 34.
  • the first end of the first RF switch 331 is connected to the second end, and the first end of the second RF switch 332 is connected to the second end.
  • the first receiving link 323 and the second receiving link 324 are in operation, the first end of the first RF switch 331 is connected to the third end, and the first end of the second RF switch 332 is connected to the third end.
  • the digital intermediate frequency processing unit 31 further includes a transmit processor 311 and a receive/feedback processor 312 coupled to the input of the first transmit link 321 and the input of the second transmit link 322, the receive/feedback processor 312 is coupled to the output of the first receive link 323 and the output of the second receive link 324.
  • the power amplifying unit 34 includes a first power amplifier 343, a second power amplifier 344, a first low noise amplifier 345, and a second low noise amplifier 346.
  • the first power amplifier 343 is connected to the output end of the first transmit link 321
  • the second power amplifier 344 is connected to the output end of the second transmit link 322 .
  • the first feedback end 341 of the first power amplifier 343 and the first RF switch 331 The second end is connected, and the second feedback end 342 of the second power amplifier 344 is connected to the second end of the second RF switch 332.
  • the first low noise amplifier 345 is connected to the third end of the first RF switch 331, and the second low noise amplifier 346 is connected to the third end of the second RF switch 332.
  • the duplex filtering unit 35 includes a first dual power filter 351 and a second dual power filter 352.
  • the first dual power filter 351 is connected to the first power amplifier 343 and the second power amplifier 344, and the second dual power filter 352 It is connected to the first low noise amplifier 345 and the second low noise amplifier 346.
  • the antenna 36 includes a first antenna 361 and a second antenna 362.
  • the first antenna 361 is connected to the first dual power filter 351, and the second antenna 362 is connected to the second dual power filter 352.
  • the present invention further provides a time division duplex system, which includes the radio remote device described in the above embodiments, and details are not described herein again.
  • the present invention provides a radio remote device, including a digital intermediate frequency processing unit, a transceiver unit, a switching unit, and a power amplifying unit
  • the transceiver unit includes at least one transmitting link and at least one receiving link
  • the digital intermediate frequency processing unit is connected to the input end of the transmitting link and the output end of the receiving link, and the output of the transmitting link
  • the terminal is connected to the power amplifying unit; when the transmitting link is working, the input end of the receiving link is connected to the feedback end of the power amplifying unit through the switching unit; when the receiving link works, the input end of the receiving link passes the switching unit and the power Amplify the unit connection. Therefore, the radio remote device of the present invention realizes feedback through the receiving link when the transmitting link works, improves the utilization rate of the receiving link, reduces the volume of the radio remote device, saves cost, and improves the competitiveness of the product.

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Abstract

本发明公开了一种射频拉远装置及时分双工系统。该射频拉远装置在发射链路工作时，接收链路的输入端通过切换单元与功率放大单元的反馈端连接；在接收链路工作时，接收链路的输入端通过切换单元与功率放大单元连接。通过上述方式，本发明在发射链路工作时通过接收链路实现反馈，提高接收链路的利用率；降低射频拉远装置的体积，并且节省成本。

Description

射频拉远装置及时分双工系统 技术领域
本发明涉及通信技术领域，尤其是涉及一种射频拉远装置及时分双工系统。
背景技术
现有的TDD(Time Division Duplexing，时分双工)系统的RRU(Radio Remote Unit，射频拉远单元)采用传统的2通道实现，其中RRU包括两个TX(Transmit Channel，下行通道)通道、两个RX(Reciever Channel，上行通道)通道以及一个FB(FeedBack，反馈)通道。
在TX通道进行工作时，RRU通过FB通道对TX通道的输出信号进行采样，以进行DPD(Digital Pre-Distortion，数字预失真)校正，此时RX通道空闲。在TX通道进行工作时，FB通道空闲。因此，在RRU进行收发切换过程中，FB通道和RX通道中有一条通道是空闲的，造成利用率下降。
发明内容
本发明主要解决的技术问题是提供一种射频拉远装置及时分双工系统，能够借助接收链路实现反馈，提高链路的利用率。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种射频拉远装置，其应用于时分双工系统，射频拉远装置包括数字中频处理单元、收发单元、切换单元以及功率放大单元，收发单元包括至少一个发射链路和至少一个接收链路，数字中频处理单元与发射链路的输入端和接收链路的输出端连接，发射链路的输出端与功率放大单元连接；
在发射链路工作时，接收链路的输入端通过切换单元与功率放大单元的反馈端连接；在接收链路工作时，接收链路的输入端通过切换单元与功率放大单元连接。
其中，切换单元包括与接收链路对应设置的至少一个射频开关，射频开关的第一端与对应的接收链路的输入端连接，射频开关的第二端与反馈端连接，射频开关的第三端与功率放大单元连接。
其中，在发射链路工作时，射频开关的第一端与第二端连接，接收链 路的输入端通过射频开关与功率放大单元的反馈端连接；在接收链路工作时，射频开关的第一端与第三端连接，接收链路的输入端通过射频开关与功率放大单元连接。
其中，在收发单元包括第一发射链路、第二发射链路、第一接收链路以及第二接收链路时，切换单元包括与第一接收链路对应设置的第一射频开关和与第二接收链路对应设置的第二射频开关；第一射频开关的第一端与第一接收链路的输入端连接，第一射频开关的第二端和与第一发射链路对应的第一反馈端连接，第一射频开关的第三端与功率放大单元连接；第二射频开关的第一端与第二接收链路的输入端连接，第二射频开关的第二端和与第二发射链路对应的第二反馈端连接，第二射频开关的第三端与功率放大单元连接。
其中，在第一发射链路和第二发射链路工作时，第一射频开关的第一端与第二端连接，第二射频开关的第一端与第二端连接；在第一接收链路和第二接收链路工作时，第一射频开关的第一端与第三端连接，第二射频开关的第一端与第三端连接。
其中，数字中频处理单元进一步包括发射处理器和接收/反馈处理器，发射处理器与第一发射链路的输入端和第二发射链路的输入端连接，接收/反馈处理器与第一接收链路的输出端和第二接收链路的输出端连接。
其中，功率放大单元包括第一功率放大器、第二功率放大器、第一低噪声放大器以及第二低噪声放大器；第一功率放大器连接第一发射链路的输出端，第二功率放大器连接第二发射链路的输出端，第一功率放大器的第一反馈端与第一射频开关的第二端连接，第二功率放大器的第二反馈端与第二射频开关的第二端连接；第一低噪声放大器与第一射频开关的第三端连接，第二低噪声放大器与第二射频开关的第三端连接。
其中，射频拉远装置进一步包括双工滤波单元，双工滤波单元包括第一双功滤波器和第二双功滤波器，第一双功滤波器与第一功率放大器和第二功率放大器连接，第二双功滤波器与第一低噪声放大器和第二低噪声放大器连接。
其中，射频拉远装置进一步包括第一天线和第二天线，第一天线与第一双功滤波器连接，第二天线与第二双功滤波器连接。
为解决上述技术问题，本发明还采用的另一个技术方案是：提供一种时分双工系统，该时分双工系统包括上述射频拉远装置。
本发明的有益效果是：区别于现有技术的情况，本发明提供一种射频拉远装置，包括数字中频处理单元、收发单元、切换单元以及功率放大单元，收发单元包括至少一个发射链路和至少一个接收链路，数字中频处理单元与发射链路的输入端和接收链路的输出端连接，发射链路的输出端与功率放大单元连接；在发射链路工作时，接收链路的输入端通过切换单元与功率放大单元的反馈端连接；在接收链路工作时，接收链路的输入端通过切换单元与功率放大单元连接。因此，本发明的射频拉远装置在发射链路工作时通过接收链路实现反馈，提高接收链路的利用率；降低射频拉远装置的体积，并且节省成本。
附图说明
图1是本发明一实施例的射频拉远装置的结构示意图；
图2是TDD系统按照3GPP协议的上行时隙配比图；
图3是本发明另一实施例的射频拉远装置的结构示意图。
具体实施方式
请参阅图1，图1是本发明一实施例的射频拉远装置的结构示意图。本实施例所揭示的射频拉远装置应用于时分双工系统(TDD系统)，在TDD系统中，接收信号和发送信号在同一频率信道(即载波)的不同时隙，用于保证时间来分离接收(上行)链路和发射(下行)链路。其中TDD系统无需成对的频率，能够使用各种频率资源，适用于不对称的上行数据传输速率和下行数据传输速率。
如图2所示，TDD系统按照现有的3GPP(3rd Generation Partnership Project，第三代合作伙伴计划)协议具有上行时隙配比，由此可知TDD系统的发射信号和接收信号不是同时存在的。
如图1所示，本实施例的射频拉远装置10包括数字中频处理单元11、收发单元12、切换单元13、功率放大单元14、双工滤波单元15以及天线16。
其中，收发单元12包括至少一个发射链路121和至少一个接收链路122，收发单元12设置发射链路121的数量与接收链路122的数量相同，例如收发单元12包括1个发射链路121和1个接收链路122、或者收发单元12包括2个发射链路121和2个接收链路122。数字中频处理单元11与发射链路121的输入端和接收链路122的输出端连接，发射链路121的输出端与功率放大单元14连接。
在发射链路121工作时，接收链路122的输入端通过切换单元13与功率放大单元14的反馈端141连接，此时射频拉远装置10通过接收链路122实现反馈，接收链路122对发射链路121输出的信号进行采样，用于校正预失真算法；在接收链路122工作时，接收链路122的输入端通过切换单元13与功率放大单元14连接，射频拉远装置10通过接收链路122接收信号。
在TDD系统中，DPD(Digital Pre-Distortion，数字预失真)相当于通过一个预失真元件和功率放大单元14级联，非线性失真功能内置于数字、数码基带信号处理芯片中，其与功率放大单元14的失真数量相等，但功能相反。射频拉远装置10将两个非线性失真功能相结合，便能实现高度线性、无失真的。数字预失真技术关键在于功率放大单元14的特性随时间、温度以及偏压的变化而变化，因器件的不同而不同。为了解决上述偏差，射频拉远装置10必须使用反馈机制，对发射链路121输出的信号进行采样，用于校正预失真算法。本实施例所揭示的射频拉远装置10在发射链路121工作时通过接收链路122实现反馈，能够避免额外增加反馈链路，提高接收链路122的利用率。
其中，切换单元13包括与接收链路122对应设置的至少一个射频开关131，即射频开关131与接收链路122一一对应。图1所示的射频拉远装置10以1个发射链路121、1个接收链路122以及1个射频开关131为例进行说明，射频开关131的第一端1311与对应的接收链路122的输入端连接，射频开关131的第二端1312与反馈端141连接，射频开关131的第三端1313与功率放大单元14连接。在发射链路121工作时，射频开关131的第一端1311与第二端1312连接，接收链路122的输入端通过射频开关131与功率放大单元14的反馈端141连接；在接收链路122工作时，射频开关131的 第一端1311与第三端1313连接，接收链路122的输入端通过射频开关131与功率放大单元14连接。
射频开关131还可以设置有控制端1314，射频开关131的控制端1314与数字中频处理单元11连接，数字中频处理单元11用于根据发射链路121的工作状态控制射频开关131的第一端1311与第二端1312或第三端1312连接。
其中，双工滤波单元15与功率放大单元14连接，天线16与双工滤波单元15连接。
在实际应用中，由于接收链路122的技术指标可以满足在发射链路121工作时进行反馈所要求的技术指标，因此射频拉远装置10在发射链路121工作时能够通过接收链路122实现反馈。例如，接收链路122的技术指标可为：增益22dB，宽带20M，NF(噪声系数)＜15dB；而反馈所要求的技术指标为：增益-16dB，宽带100M，NF＜44dB。在发射链路121工作时，调整接收链路122的增益以达到反馈所要求的增益，22dB-38dB＝-16dB。接收链路122的宽带小于反馈所要求的宽带，则将接收链路122的宽带设置为100M；接收链路122的NF小于反馈所要求的NF。因此设置接收链路122的技术指标为增益22dB，宽带100M，NF＜15dB即可满足反馈所要求的技术指标。
与现有技术的TDD系统相比，本实施例的射频拉远装置10在发射链路121工作时通过接收链路122实现反馈，由于接收链路122的技术指标优于反馈所要求的技术指标，因此本实施例的射频拉远装置10的技术指标更优。此外，本实施例的射频拉远装置10节省FB通道，射频链路减少1/5，对应的PCB减少1/10，射频拉远装置10的体积减少1/10，成本降低约15％，因此降低射频拉远装置10的体积，节省成本，提高产品的竞争力。
本发明还提供另一实施例的射频拉远装置，如图3所示，本实施例所揭示的射频拉远装置30以2个发射链路、2个接收链路以及2个射频开关为例进行说明。
收发单元32包括第一发射链路321、第二发射链路322、第一接收链路323以及第二接收链路324，切换单元33包括与第一接收链路323对应设置的第一射频开关331和与第二接收链路324对应设置的第二射频开关 332。
第一射频开关331的第一端与第一接收链路323的输入端连接，第一射频开关331的第二端和与第一发射链路321对应的第一反馈端341连接，第一射频开关331的第三端与功率放大单元34连接。第二射频开关332的第一端与第二接收链路324的输入端连接，第二射频开关332的第二端和与第二发射链路322对应的第二反馈端342连接，第二射频开关332的第三端与功率放大单元34连接。
其中，在第一发射链路321和第二发射链路322工作时，第一射频开关331的第一端与第二端连接，第二射频开关332的第一端与第二端连接。在第一接收链路323和第二接收链路324工作时，第一射频开关331的第一端与第三端连接，第二射频开关332的第一端与第三端连接。
数字中频处理单元31进一步包括发射处理器311和接收/反馈处理器312，发射处理器311与第一发射链路321的输入端和第二发射链路322的输入端连接，接收/反馈处理器312与第一接收链路323的输出端和第二接收链路324的输出端连接。
功率放大单元34包括第一功率放大器343、第二功率放大器344、第一低噪声放大器345以及第二低噪声放大器346。第一功率放大器343连接第一发射链路321的输出端，第二功率放大器344连接第二发射链路322的输出端，第一功率放大器343的第一反馈端341与第一射频开关331的第二端连接，第二功率放大器344的第二反馈端342与第二射频开关332的第二端连接。第一低噪声放大器345与第一射频开关331的第三端连接，第二低噪声放大器346与第二射频开关332的第三端连接。
双工滤波单元35包括第一双功滤波器351和第二双功滤波器352，第一双功滤波器351与第一功率放大器343和第二功率放大器344连接，第二双功滤波器352与第一低噪声放大器345和第二低噪声放大器346连接。
其中，天线36包括第一天线361和第二天线362，第一天线361与第一双功滤波器351连接，第二天线362与第二双功滤波器352连接。
本发明还提供一实施例的时分双工系统，该时分双工系统包括上述实施例所描述的射频拉远装置，在此不再赘述。
综上所述，本发明提供一种射频拉远装置，包括数字中频处理单元、 收发单元、切换单元以及功率放大单元，收发单元包括至少一个发射链路和至少一个接收链路，数字中频处理单元与发射链路的输入端和接收链路的输出端连接，发射链路的输出端与功率放大单元连接；在发射链路工作时，接收链路的输入端通过切换单元与功率放大单元的反馈端连接；在接收链路工作时，接收链路的输入端通过切换单元与功率放大单元连接。因此，本发明的射频拉远装置在发射链路工作时通过接收链路实现反馈，提高接收链路的利用率；并且降低射频拉远装置的体积，节省成本，提高产品的竞争力。
以上所述仅为本发明的实施例，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 (10)

  1. 一种射频拉远装置，其特征在于，所述射频拉远装置应用于时分双工系统，所述射频拉远装置包括数字中频处理单元、收发单元、切换单元以及功率放大单元，所述收发单元包括至少一个发射链路和至少一个接收链路，所述数字中频处理单元与所述发射链路的输入端和所述接收链路的输出端连接，所述发射链路的输出端与所述功率放大单元连接；
    在所述发射链路工作时，所述接收链路的输入端通过所述切换单元与所述功率放大单元的反馈端连接；在所述接收链路工作时，所述接收链路的输入端通过所述切换单元与所述功率放大单元连接。
  2. 根据权利要求1所述的射频拉远装置，其特征在于，所述切换单元包括与所述接收链路对应设置的至少一个射频开关，所述射频开关的第一端与对应的所述接收链路的输入端连接，所述射频开关的第二端与所述反馈端连接，所述射频开关的第三端与所述功率放大单元连接。
  3. 根据权利要求2所述的射频拉远装置，其特征在于，在所述发射链路工作时，所述射频开关的第一端与所述第二端连接，所述接收链路的输入端通过所述射频开关与所述功率放大单元的反馈端连接；在所述接收链路工作时，所述射频开关的第一端与所述第三端连接，所述接收链路的输入端通过所述射频开关与所述功率放大单元连接。
  4. 根据权利要求2所述的射频拉远装置，其特征在于，在所述收发单元包括第一发射链路、第二发射链路、第一接收链路以及第二接收链路时，所述切换单元包括与所述第一接收链路对应设置的第一射频开关和与所述第二接收链路对应设置的第二射频开关；所述第一射频开关的第一端与所述第一接收链路的输入端连接，所述第一射频开关的第二端和与所述第一发射链路对应的第一反馈端连接，所述第一射频开关的第三端与所述功率放大单元连接；所述第二射频开关的第一端与所述第二接收链路的输入端连接，所述第二射频开关的第二端和与所述第二发射链路对应的第二反馈端连接，所述第二射频开关的第三端与所述功率放大单元连接。
  5. 根据权利要求4所述的射频拉远装置，其特征在于，在所述第一发射链路和所述第二发射链路工作时，所述第一射频开关的第一端与所述第 二端连接，所述第二射频开关的第一端与所述第二端连接；在所述第一接收链路和所述第二接收链路工作时，所述第一射频开关的第一端与所述第三端连接，所述第二射频开关的第一端与所述第三端连接。
  6. 根据权利要求5所述的射频拉远装置，其特征在于，所述数字中频处理单元进一步包括发射处理器和接收/反馈处理器，所述发射处理器与所述第一发射链路的输入端和所述第二发射链路的输入端连接，所述接收/反馈处理器与所述第一接收链路的输出端和所述第二接收链路的输出端连接。
  7. 根据权利要求6所述的射频拉远装置，其特征在于，所述功率放大单元包括第一功率放大器、第二功率放大器、第一低噪声放大器以及第二低噪声放大器；所述第一功率放大器连接所述第一发射链路的输出端，所述第二功率放大器连接所述第二发射链路的输出端，所述第一功率放大器的第一反馈端与所述第一射频开关的第二端连接，所述第二功率放大器的第二反馈端与所述第二射频开关的第二端连接；所述第一低噪声放大器与所述第一射频开关的第三端连接，所述第二低噪声放大器与所述第二射频开关的第三端连接。
  8. 根据权利要求7所述的射频拉远装置，其特征在于，所述射频拉远装置进一步包括双工滤波单元，所述双工滤波单元包括第一双功滤波器和第二双功滤波器，所述第一双功滤波器与所述第一功率放大器和所述第二功率放大器连接，所述第二双功滤波器与所述第一低噪声放大器和所述第二低噪声放大器连接。
  9. 根据权利要求8所述的射频拉远装置，其特征在于，所述射频拉远装置进一步包括第一天线和第二天线，所述第一天线与所述第一双功滤波器连接，所述第二天线与所述第二双功滤波器连接。
  10. 一种时分双工系统，其特征在于，所述时分双工系统包括上述权利要求1-9任意一项所述的射频拉远装置。
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