一种CPM信号参数盲估计方法

A Blind Parameter Estimation Algorithm for CPM Signals

针对非协作通信下CPM信号参数盲估计问题,提出了一种系统的有序的盲估计方法,实现了对CPM信号的载频、符号速率、调制指数和调制阶数等参数的精确估计。利用CPM信号的循环平稳特性,采用了基于周期谱的符号速率估计方法,构建了代价函数,采用联合估计法对调制指数和频偏实现了三维的精确搜索,最后实现了基于循环平稳性的CPM信号调制阶数的准确识别。理论分析与试验仿真表明,新方法具有较高的正确估计概率,且在低信噪比下也能达到较好的效果。

A blind parameter estimation algorithm for CPM signals in terms of carrier frequency, symbol rate, modulation index and modulation order is proposed to solve the parameter estimation problem of CPM signals in the non-cooperative communication. The algo- rithm of symbol rate estimation is analyzed based on the features of cyclic stationarity of CPM signals and joint estimation of modulation index and frequency offset is given according to the result of symbol rate estimation. Lastly, the recognition algorithm of modulation order is analyzed based on cyclic stationarity of the signal. Simulation results indicate the validity of the algorithm with high performance under low SNR.