Turbo编解码结构及基于LOG-MAP算法的性能仿真研究  

Structure of Turbo Encoder/Decoder and Performance Simulation Based on LOG-MAP Algorithm

作　　者：谢玉明[1] 曹素华[1] 肖扬[1] 

机构地区：[1]北京交通大学信息科学研究所,北京100044

出　　处：《中国铁道科学》2005年第1期83-89,共7页China Railway Science

基　　金：国家自然科学基金资助项目(69971002)

摘　　要：阐述Turbo码的编解码结构。研究MAP以及LOG MAP解码算法。设计MATLAB仿真运算程序。根据设计的仿真程序比较Turbo码在不同约束长度、不同迭代次数以及不同编码速率情况下的性能。由仿真结果得出影响Turbo码性能的主要因素是交织器长度、迭代次数、编码速率。在各种情况下通过增加交织器长度和迭代次数、降低编码速率来改善Turbo码的性能。The structures of Turbo encoder and decoder are discussed. MAP algorithm and LOG-MAP algorithm, which are decoding methods, are studied. The emulator with the software of MATLAB is designed. According to the designed emulator, performances of Turbo code are compared under different situations, such as different constrained length, different times of iteration and different encoding speed. From simulation results, main factors affecting the performance of Turbo code are educed, namely, interweaver length, times of iteration and encoding rate. Performances of Turbo code are improved under various conditions by increasing the length of interweaver and times of iteration as well as decreasing encoding speed.

关 键 词：仿真计算 TURBO码 MAP算法 LOG-MAP算法 迭代算法 仿真曲线 

分 类 号：TN914[电子电信—通信与信息系统]