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Method for detecting SWR (standing-wave ratio) of PDD (Frequency Division Duplex) LTE (Long Term Evolution) RRU (Remote Radio Unit)

A remote radio frequency unit and VSWR detection technology, applied in the field of communication, can solve the problems of forward power and reverse power not corresponding to the same segment of data, VSWR false alarm, etc., to save FPGA resources and reduce VSWR Poppy false alarm, flexible operation effect

Active Publication Date: 2015-06-24
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

[0005] The present invention proposes a new standing wave ratio detection method for the FDD LTE RRU system, which is used to solve the problem that in the RRU system, the forward and reverse power statistics share the same feedback channel, resulting in the forward power and reverse power of each statistics Not corresponding to the same piece of data, which may lead to false alarms of standing wave ratio

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  • Method for detecting SWR (standing-wave ratio) of PDD (Frequency Division Duplex) LTE (Long Term Evolution) RRU (Remote Radio Unit)
  • Method for detecting SWR (standing-wave ratio) of PDD (Frequency Division Duplex) LTE (Long Term Evolution) RRU (Remote Radio Unit)
  • Method for detecting SWR (standing-wave ratio) of PDD (Frequency Division Duplex) LTE (Long Term Evolution) RRU (Remote Radio Unit)

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Embodiment Construction

[0025] The technical solution of the present invention will be described in detail below in conjunction with the drawings and embodiments.

[0026] figure 1 It is a block diagram of the multi-channel RRU standing wave ratio detection system of the embodiment, mainly consisting of several parts: a central processing unit CPU, a programmable logic gate array FPGA, an analog-to-digital converter, a multi-channel selection switch, a power amplifier, etc., and there are N Channels have power amplifiers 1, 2...N connected to antennas 1, 2...N respectively. The specific hardware is implemented as the prior art. This method utilizes the functions realized by each module as follows: the CPU is responsible for the calculation of the standing wave ratio and the switching of the channel and the forward and reverse switches; the FPGA is responsible for the statistics of the baseband and forward power and reverse power, wherein the position of the baseband signal power statistics is The d...

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Abstract

The invention discloses a method for detecting the SWR of a PDD LTE RRU. The method comprises the steps as follows: upper sum feedback link time delays of an RRU downlink plate are measured; for each channel, a CPU controls a front reverse changeover switch to be switched to the forward direction for power counting; an FPGA (field programmable gate array) performs baseband power and forward power counting on corresponding channels according to control signals; firstly, the baseband power is counted, and forward power is counted after the upper sum feedback link time delays of the downlink plate are measured lingeringly; likewise, the CPU controls the front reverse changeover switch to be switched to a reverse direction, reverse power and corresponding baseband power are counted; the CPU calculates a difference value of the forward power and the baseband power corresponding to the reverse power, and new forward power or reverse power is calculated; and the CPU calculates the SWR with the calculated forward power or reverse power.

Description

technical field [0001] The present invention relates to the field of communication technology, to be precise, relates to a standing wave ratio detection method in an FDD LTE RRU system, which can avoid the false alarm problem of the standing wave ratio that may be caused by forward power and reverse power statistics at different times . Background technique [0002] LTE (Long Term Evolution, long-term evolution technology) is the long-term evolution of 3G, which is currently called 4G, including two duplex modes: TDD (Time Division Duplex) and FDD (Frequency Division Duplex). The FDD (Frequency Division Duplex) LTE is FDD-LTE. The feature of the FDD mode is that the system simultaneously receives and transmits on two separated symmetrical frequency channels, and uses guaranteed frequency bands to separate the receiving and transmitting channels. [0003] In the radio frequency link, the standing wave ratio is a value used to indicate whether the antenna and the radio wave t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/30G01R27/06
Inventor 魏恒江浩洋周世军杨浩
Owner WUHAN POST & TELECOMM RES INST CO LTD
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