无线OFDM系统自适应预失真器实现  

An Adaptive Predistorter Scheme in Wireless OFDM Transmitter

作　　者：王勇[1] 葛建华[1] 艾渤[1] 刘培[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《电路与系统学报》2004年第5期49-52,90,共5页Journal of Circuits and Systems

基　　金：国家数字视频广播关键技术研究基金

摘　　要：本文深入研究了无线 OFDM 系统的预失真技术,针对 OFDM 信号的高峰平比特性及高功率放大器带来的非线性失真影响,提出了基于查表法的基带自适应预失真器解决方案,给出其自适应递归算法及查询表内容的更新策略;并利用计算机仿真对本方案的性能进行了分析,仿真结果表明:本方案可以有效改善放大器的非线性特性。Adaptive predistortion technique in digital wireless OFDM modulation scheme is investigated. To combat the large peak-to-average power ratio of OFDM signals and the nonlinear distortion introduced by high power amplifier (HPA), a novel predistorter based on the look-up-table suitable for the OFDM transmitte is proposed. The adaptive algorithm and the modification method of look-up-table are also presented. Through computer simulation, the performance of the predistorter proposed for OFDM system is analyzed. Simulation results prove the validity and efficient performance of proposed scheme.

关 键 词：正交频分复用(OFDM) 峰平比(PAPR) 自适应预失真器 高功率放大器(HPA) 

分 类 号：TN913[电子电信—通信与信息系统]