近似Log-MAP turbo译码器研究  

Studies of Approximated Log-MAP Turbo Decoders

作　　者：张琳[1] 刘星成[1] 张晓瑜[1] 张光昭[1] 

机构地区：[1]中山大学电子与通信工程系,广州510275

出　　处：《计算机工程与应用》2005年第14期53-56,共4页Computer Engineering and Applications

基　　金：国家自然科学基金项目(编号:90304011);中山大学青年启动基金项目

摘　　要：该文研究近似Log-M AP算法在turbo译码器中的应用。文章对基于近似算法的W CDM A turbo译码器在AW GN信道和平坦慢衰落Rayleigh信道上的纠错性能进行了仿真。仿真结果表明,二阶近似Log-M AP turbo译码器与M A P turbo译码器性能等价,优于SO VA turbo译码器0.7-0.9dB。In this paper,approximated Log-MAP turbo decoders are studied.BER performances of WCDMA turbo decoders based on the approximated Log-MAP algorithms are simulated and compared over AWGN channel and flat slow fading Rayleigh channel.Simulation results show that BER performances of second-order approximated Log-MAP algorithm are equivalent to the MAP algorithm,with 0.7-0.9dB higher than that of SOVA turbo decoder.

关 键 词：近似Log—MAP算法 TURBO译码器 WCDMA 

分 类 号：TN911.22[电子电信—通信与信息系统]