一种应用于OFDM通信系统的简化软判决算法  

Simplified Soft Decision Algorithm for OFDM System

作　　者：卢海风[1] 陈伟[1] 黄秋元[1] 

机构地区：[1]武汉理工大学信息工程学院,武汉430070

出　　处：《武汉理工大学学报（交通科学与工程版）》2009年第1期114-116,120,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家863计划项目资助(批准号:2003AA134010)

摘　　要：应用软判决算法可以对通信系统的性能进行改善.对解调模块软信息的提取进行了理论分析,研究了一种含有信道状态信息(CSI)的软信息提取的简化表达,并通过在典型的OFDM通信系统,IEEE802.11a基带模型上,在无线多径信道下进行性能仿真,仿真结果表明应用了软判决的系统性能明显优于硬判决系统,并且软信息提取的简化算法在降低算法复杂度的同时几乎不影响系统性能.The performance of the communication system can be improved by using soft decision algorithms. The methods of soft demapping including channel state information（CSI） for demodulator were analyzed,and its simplified methods were also given. These algorithms were simulated with application to typical OFDM system,IEEE802. 11a,with wireless multipaths. The results show that the soft decision methods greatly outperform the hard method,and the simplified soft demapping method with low computational complexity has the same performance as the general soft demapping method.

关 键 词：软判决 正交幅度调制 无线局域网 OFDM 

分 类 号：TN911[电子电信—通信与信息系统]