Turbo CPM系统Log-MAP译码算法优化  

Optimal Log-MAP decoding algorithm in Turbo CPM system

作　　者：章敏[1] 唐宁[1] 廖圣鹏[1] 

机构地区：[1]桂林电子科技大学,广西桂林541004

出　　处：《电子设计工程》2010年第1期21-23,共3页Electronic Design Engineering

摘　　要：探讨基于Turbo原理进行迭代检测的编码连续相位调制(CPM)系统在无限瑞利衰落信道下的Log-MAP译码算法。根据CPM的分解模型,CPM分解为连续相位编码(CPE)与无记忆调制(MM)的组合。基于CPE的记忆特性和递归特性,结合外部的卷积码及交织器,建立串行级联Turbo CPM系统模型。提出衰落信道下基于加权外信息交换的Turbo CPM改进译码算法,有效改善系统收敛性,并探讨不同系统参数对系统性能的影响。The Log-MAP decoding algorithm of coded continuous phase modulation （CPM）based on Turbo principle in Rayleigh fading channels is studied.According to the decomposed mode/of CPM,CPM is separated into two devices,including continuous phase encoder（CPE）and memory less modulator（MM）.Based on memory and reeursive of CPE,combining with cirrocumulus code and inter leaver,the system model of Turbo CPM is founded.An improved Turbo CPM decoding algorithm based on exchange of extrinsic information is proposed,which effectively improves the performance of Turbo CPM. The effect on system performance of different system parameters is discussed.

关 键 词：TURBO码 CPM调制 瑞利衰落 Log—MAP译码算法 

分 类 号：TN911.2[电子电信—通信与信息系统]