OFDM中一种自适应盲均衡及改进算法  

Blind Adaptive TEQ with Improved Algorithm for OFDM System

作　　者：陈先福[1] 李有明[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《计算机仿真》2008年第9期122-123,178,共3页Computer Simulation

基　　金：浙江省自然科学基金(Y105619);宁波市自然科学基金(2006A610002);华为技术公司项目等

摘　　要：信道均衡在多载波系统中有很重要的应用。研究了OFDM信道自适应盲均衡问题,首先分析了Merry算法,基本思想是如果有效信道长度缩短到循环前缀长度以内,那么接收端符号具有和发送端符号一样的性质。但是Merry算法所构造的代价函数仅考虑了OFDM符号中循环前缀最后一个抽样与该符号最后一个抽样之间的关系。针对问题,构造了一个新的代价函数,利用了OFDM符号循环前缀中所有抽样的信息。文中对新算法进行了仿真验证,仿真结果表明,算法性能上明显要好于Merry算法。Time-domain equalization plays a very important role in multi-carrier modulation.This paper exploits the blind adaptive time domain equalization for OFDM channels.Merry blind algorithm is considered.Its basic idea is that the received symbol is the same as the transmitted one if the effective channel is shorter than the cyclic prefix（CP） length.Based on this result,Merry blind algorithm is designed by using the relationship between the last sample in one CP and the last sample in the same OFDM received symbol.Different from Merry blind algorithm,the paper derives a new cost function which uses all the transmitted symbols in one CP.Computer simulation results verify the analysis,and show that the new algorithm has better performance than Merry blind algorithm.

关 键 词：正交频分复用 盲时域信道均衡 循环前缀 

分 类 号：TN914[电子电信—通信与信息系统]