OFDM系统中一种改进的最大似然同步迭代算法  

An Improved Synchronization Iterative ML Algorithm in OFDM System

作　　者：王东[1] 栾英姿[1] 刘媛媛[2] 

机构地区：[1]西安电子科技大学通信工程学院,陕西西安710071 [2]解放军西安通信学院一系,陕西西安710106

出　　处：《电子科技》2008年第10期31-34,共4页Electronic Science and Technology

基　　金：国家自然科学基金资助项目(60496316)

摘　　要：在考虑多径衰落信道的影响下,改进了基于循环前缀的最大似然(ML)同步迭代算法,弥补了原ML迭代算法只在高斯白噪声信道背景下才能得到准确的定时和频率偏差估计的不足,实现了多径衰落信道下的同步估计。并在多径衰落信道下进行了仿真实验,结果表明改进迭代算法在具有较好的同步性能。With the effect of the multi-path fading channel taken into consideration, the synchronization iterative ML algorithm based on cyclic prefix is improved. It can improve the weakness of the primary iterative ML algorithm in the estimation of timing and frequency offset in AWGN noise channel and establish accurate synchronization in the multi-path fading channel. Simulation results conducted multi-path fading channel show that the improved algorithm has better synchronization performance.

关 键 词：OFDM 迭代ML算法 定时和频率偏差 同步 

分 类 号：TN914[电子电信—通信与信息系统]