低信噪比下的Turbo编译码算法研究及性能评估  

Analysis and Evaluation of Turbo Coding and Decoding Algorithms Based on Low SNR

作　　者：黄和斌 肖扬[2] 

机构地区：[1]北京莘夏科技开发有限责任公司,北京100011 [2]北京交通大学信息科学研究所,北京100044

出　　处：《铁道学报》2004年第2期66-71,共6页Journal of the China Railway Society

基　　金：国家自然科学基金项目(69971002)

摘　　要：由于Turbo码优异的纠错性能,CDMA2000与WCDMA将其作为候选的信道编码方案。本文研究了Turbo码的基本原理和编解码算法,在此基础上对Turbo码编解码系统进行了计算机仿真。本文设计的Turbo码编解码采用了伪随机交织器,它将低重量输入信息序列产生低重量编码序列的关系打破,提高了Turbo码编解码系统性能。系统仿真结果及分析表明有译码迭代次数、RSC分量码,交织器大小与交织器图等几个因素会影响Turbo码编解码系统性能。Due to the excellent performance of error correcting, turbo codes have been selected as the candidate channel coding schemes for CDMA2000 and WCDMA. This paper studies the basic principle of turbo codes and their coding and decoding algorithms and computer simulation. The design of the Turbo encoding, and decoding systems adopts the pseudo-random interleaver which breaks the relation that the low weight input sequence produces the low weight code sequence and improves the performance of the Turbo encoding and decoding systems. Simulation results and analysis show that some factors, such as the number of the times of decoding iteration, RSC codes, the length of the interleaver, and the interleaver map, will influence the performance of Turbo encoding and decoding systems.

关 键 词：无线通信 TURBO码 LOG-MAP算法 迭代译码 

分 类 号：TN914.3[电子电信—通信与信息系统]