A nonlinear compensation method and an optical carrier wireless communication system

Abstract

The invention provides a nonlinear compensation method and an ROF system. The method comprises the steps that an RRU obtains a first input training signal; The RRU inputs the first input training signal into a feedback link; The DPD processing unit obtains a first output training signal output from the feedback link; The DPD processing unit determines nonlinear characteristics of the feedback linkaccording to the first input training signal and the first output training signal; And the DPD processing unit performs nonlinear compensation on the feedback link according to the nonlinear characteristic of the feedback link. According to the non-linear compensation method provided by the embodiment of the invention, the non-linear characteristic of the feedback link in the ROF wireless transmitter can be obtained in advance, and the non-linear characteristic of the feedback link is compensated in advance. And then, the real nonlinear characteristic of the downlink can be obtained, so thatthe real nonlinear characteristic of the downlink can be compensated in advance, the linearization of the ROF system is realized, and the system performance can be improved.

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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