基于多符号分组的CPM软输出非相干检测算法

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。

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

A non-coherent detection algorithm for CPM was proposed.Several sequential symbols were used as the ob-servation window to calculate the prior probability for codeword in CPM soft demodulation process,and the more obser-vation 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 dif-ferent 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.