一种Turbo译码算法改进研究  

Research on Improved Turbo Decoding Algorithm

作　　者：简宏华[1] 马海武[1] 

机构地区：[1]西安建筑科技大学信控学院,陕西西安710055

出　　处：《通信技术》2008年第2期28-29,共2页Communications Technology

摘　　要：Turbo码是近年来广泛应用于通信系统中的一种性能优异的编码方式。文中首先分析了基于最大后验概率的Turbo码传统译码算法,然后指出了使用这类算法具有大译码延时的缺点,分析了常用的能减小译码延时的SW-MAP算法;最后根据此算法的特点提出了SW-MAP算法的改进方案。算法改进后能有效降低译码延时,提高译码性能。Turbo-codes is a code scheme with excellent decoding performance,widely used in communication system recently. This paper first analyses the conventional algorithm for Turbo-codes decoding based on MAP,then points out the defect of these algorithm on decoding delay,analyzes conventional SW-MAP algorithm that can reduce decoding delay;and finally presents an improved scheme of SW-MAP algorithm based on its characters. The improved algorithm can reduce decoding delay and raise decoding performance effectively.

关 键 词：MAP算法 LOG-MAP算法 SW-MAP算法 

分 类 号：TN911.22[电子电信—通信与信息系统]