SOVA算法对Viterbi算法的修正  

The Modification of SOVA on Viterbi Algorithm

作　　者：杨建祖[1] 顾小卓[1] 杜晓宁[1] 胡捍英[1] 

机构地区：[1]信息工程大学信息工程学院,郑州450002

出　　处：《通信技术》2007年第4期4-6,共3页Communications Technology

基　　金：总装预研基金资助项目

摘　　要：在Viterbi算法中引入软值进行修正之后的算法称作SOVA算法(Soft Output Viterbi Algorithm)。SOVA算法在Viterbi算法的基础上,路径量度引入了比特先验信息,对每位译码比特以后验概率似然比的形式提供软输出,因而可提供更高的译码性能。特别,SOVA算法可用于级联码的迭代译码,采用Tuobo原理使不同分量码之间交换软信息,从而可显著提高这类码的纠错能力。SOVA is the modification of Viterbi algorithm by introducing the soft value. Based on the classical Viterbi algorithm its path metrics are modified to take account of a-priori information and it provides a soft output in the form of the a-posteriori LLR for each decoded bit, so SOVA can give more reliable estimation of the decoded bit. In particular, SOVA can be used in iterative decoding of concatenated code and the performance is remarkably improved by exchanging soft value between different component codes.

关 键 词：软输出Veitebi算法 对数似然比 软判决 

分 类 号：TN911.22[电子电信—通信与信息系统]