Turbo码译码算法理论推导及误码性能分析  

Theoretical derivation and error performance analysis of Turbo decoding algorithm

作　　者：付婉 杨茂辉 胡明亮 张燕华 Fu Wan;Yang Maohui;Hu Mingliang;Zhang Yanhua(College of Computer and Information,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学计算机与信息学院

出　　处：《电子测量技术》2018年第11期10-14,共5页Electronic Measurement Technology

摘　　要：Turbo码的译码比常规的卷积码要复杂的多,经典的译码算法MAP算法运算量极大,运算中不仅有大量的乘法和加法,还有在数字电路中较难实现的指数和对数运算,这极大的影响了MAP算法的实用性。基于此,首先简要概述了Turbo编码原理,然后,主要探究了Log-MAP算法的推导,并对SOVA算法进行了介绍。虽然这两种算法性能有所减弱,但是大大降低了Turbo码的译码复杂度,更加适合于实际系统的运用。最后,通过仿真比较了LogMAP以及SOVA算法的误码性能。Turbo decoding is more complex than conventional convolutional code.The classical decoding algorithm MAP is very computationally intensive.In computing,not only a large number of multiplication and addition,but also exponential and logarithmic arithmetic which are hard to be realized in digital circuits have greatly affected the practicability of MAP algorithm.Based on this,this paper briefly outlines the principle of Turbode coding,and then,mainly explores the derivation of Log-MAP algorithm,and introduces the SOVA algorithm.The performance of these two algorithms weakened,but greatly reduces the decoding complexity Turbo code,more suitable for the actual system.Finally,this paper compares the error performance of Log-MAP and SOVA algorithm by simulation.

关 键 词：TURBO码 译码 LOG-MAP算法 SOVA算法 

分 类 号：TN911.22[电子电信—通信与信息系统]