Power Magnify Pre-distortion Technology in Broad Band OFDM Communicate System
Cao Yua · Ship Electronic Engineering · 2013
OFDM is the core physics technology in 4G(LTE),but it has the problem of high peak-average-rate and is sensitive to frequency phase distortion,so it needs high linearity in channel.In the base of modeling and analyze power magnify non-linear characteristic using AM-AM and AM-PM transfer characteristic,a method is proposed based local receive channel detect the power magnify distortion characteristic of the transmit channel,the pre-distortion data table is built,and the pre-distortion in the base band is mode,so the power magnify nonlinear distortion is eliminated,and its performance is analyzed using the simulator.This method obtains big advance in amplitude using small system cost,and is very applicable in engineering system.