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.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
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)
