Nonlinear Compensation Method and Wireless Communication System over Optical Fiber

Abstract

The present application provides a nonlinear compensation method and an ROF system, the method comprising: the RRU acquires the first input training signal; the RRU inputs the first input training signal into the feedback link; the DPD processing unit acquires the output from the feedback link The first output training signal; the DPD processing unit determines the nonlinear characteristics of the feedback link according to the first input training signal and the first output training signal; the DPD processing unit performs non-linear characteristics on the feedback link according to the nonlinear characteristics of the feedback link linear compensation. The non-linear compensation method provided in the embodiment of the present application can obtain the non-linear characteristics of the feedback link in the ROF wireless transmitter in advance, and pre-compensate the non-linear characteristics of the feedback link. After that, the real nonlinear characteristic of the downlink can be obtained, so that the real nonlinear characteristic of the downlink can be pre-compensated in advance, and the linearization of the ROF system can be realized, which can improve the system performance.

Description

technical field [0001] This application relates to the field of communications, and more specifically, to a method of nonlinear compensation and a wireless communication system over optical Background technique [0002] In the wireless communication system, radio over fiber (ROF) is a new type of wireless transmitter architecture (system), and the ROF wireless transmitter architecture (which can be called "ROF" system) is a new type of wireless transmitter The architecture is to convert the analog signal into an optical signal first, then transmit it remotely through the optical fiber, and then convert the optical signal into the same analog signal after reaching the destination, so as to achieve the purpose of directly transmitting the analog signal. [0003] In the traditional wireless transmitter architecture, the remote radio unit (Remote Radio Unit, RRU) converts the baseband optical signal into a radio frequency signal at the remote end, amplifies and transmits it. Th...

AI Technical Summary

Problems solved by technology

As a result, when the digital pre-distortion processing unit performs digital pre-distortion processing on the downlink (PA and downlink ROF fiber), it cannot obtain the real nonlinear characteristics of the downlink, so that the nonlinear compensation cannot be performed correctly

This leads to poor linearization of the system and affects system performance.

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