一种应用于LTE系统的Viterbi译码算法  

A Viterbi Decoding Algorithm Used in LTE System

作　　者：李小文[1] 罗友宝[1] 

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《电信科学》2010年第7期99-103,共5页Telecommunications Science

基　　金：国家科技重大专项"TD-LTE无线综合测试仪表开发"

摘　　要：LTE(long term evolution,长期演进)系统中采用了咬尾卷积码和Turbo码来实现前向纠错,Viterbi译码是卷积码的一种杰出的译码算法,它是一种最大似然译码方法。本文基于LTE系统中的咬尾卷积码,详细分析了几种较成熟的Viterbi译码算法,并综合现有算法,提出了一种改进算法,减小了译码计算的复杂度。仿真结果表明,改进算法在降低译码计算复杂度的同时还降低了译码误比特率,因此非常适合LTE系统的译码要求。Long term evolution （LTE） system used the tailbiting convolutional codes and the turbo codes to achieve forward error correction （FEC）.Viterbi decoding is an outstanding convolutional code decoding algorithm,it is a maximum likelihood decoding method.Based on LTE tailbiting convolutional codes,this paper analysised several existing viterbi decoding algorithms,and proposed an improved algorithm to reduce the decoding computational complexity.The simulation results show that the improved decoding algorithm not only reduces the computational complexity of decoding ,but also reduces the bit error rate,so it is very suitable for the decoding requirements of LTE system.

关 键 词：长期演进 前向纠错 咬尾卷积码 VITERBI译码 

分 类 号：TN764[电子电信—电路与系统]