基于HPA特性曲线拟合的自适应预失真技术  

Adaptive predistortion technology based on HPA Characteristic Curve Fitting in OFDM System

作　　者：杨文考[1] 刘小平 周尚波[1] 朱维乐[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都610054 [2]湖南省南岳电视调频发射台,湖南南岳421001

出　　处：《系统工程与电子技术》2004年第2期167-169,202,共4页Systems Engineering and Electronics

摘　　要：提出了一种用于正交频分复用(OFDM)系统中补偿由大功率放大器引起的非线性失真的基带自适应预失真方法。自适应预失真器是基于对大功率放大器的非线性特性进行分段估计,由曲线拟合逐段取逆变换来训练大功率放大器的预失真器的非线性参数,以达到预是真补偿的目的。计算机仿真结果表明,该方法具有收敛速度快、需要动态存储器(RAM)少、补偿效果好等特点。A digital base band adaptive predistortion method to compensate nonlinear distortions introduced by a high-power amplifier (HPA) in orthogonal frequency division multiplexing (OFDM) system is proposed. The adaptive predistorter given can achieve the predistortion compensation based on piecewise estimating HPA nonlinear characteristic curve and training HPA estimator nonlinear parameters via performing inverse transform with curve fitting section by section. The computer simulation result shows that the method algorithm converges fast, RAM requires less and compensation effect is good.

关 键 词：正交频分复用系统 大功率放大器 非线性失真 自适应预失真 无线通信 HPA特性曲线拟合 

分 类 号：TN92[电子电信—通信与信息系统]