基于多符号分组的CPM软输出非相干检测算法  

Multiple symbol soft-output non-coherent detection of serial concatenated CPM

作　　者：杨友福[1] 刘建伟[1] 张其善[1] 修春娣[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《通信学报》2012年第8期113-118,共6页Journal on Communications

基　　金：国家重点基础研究发展规划基金资助项目(10961013);国家教育部博士点基金资助项目(20091102110004);国家重点基础研究发展计划("973"计划)基金资助项目(2012CB315900)~~

摘　　要：提出了一种CPM非相干检测算法,以连续多个符号为观测窗计算码字先验概率,以此完成CPM软解调计算操作,算法性能随着观测符号长度增加而提高。给出了非相干接收机结构,利用Walsh基函数扩展方法减少匹配接收计算量。仿真研究了不同CPM调制参数下卷积编码CPM系统非相干检测性能,结果表明,提出的非相干检测算法具有很好的顽健性,对于2CPM、4CPM串行级联编码调制,当观测长度为4个符号时,系统性能较单符号非相干检测算法有近6dB增益。A non-coherent detection algorithm for CPM was proposed. Several sequential symbols were used as the observation window to calculate the prior probability for codeword in CPM soft demodulation process, and the more observation symbols were used, the better performance the algorithm achieved. Non-coherent receiver architecture was given, in which expansion method of Walsh basis function was utilized to reduce the calculating amount in matched filtering. Non-coherent detection performances of convolutional encoding CPM system adopting the proposed algorithm, with different CPM modulation parameters, were compared through simulation. The results indicate that proposed non-coherent detection algorithm brings significant robustness. As to 2CPM, 4CPM serial concatenated encoding modulation, when the observation length gets to 4 symbols, system with the proposed algorithm gets nearly 6dB performance improvement than with the single-symbol non-coherent detection algorithm.

关 键 词：CPM 串行级联编码调制 非相干检测 迭代译码 

分 类 号：TN911-3[电子电信—通信与信息系统]