一种基于循环谱的MPSK信号符号速率估计方法*

针对频谱感知的实际应用，在循环平稳理论的基础上，研究了经过脉冲成形滤波器滤波后的MPSK信号的循环谱特性，通过分析有限数据条件下剩余带宽对循环谱估计的影响，提出一种恒包络处理与频域平滑循环周期图结合的符号速率估计算法，仿真表明该方法在有限数据条件下具有良好的性能，而且在剩余带宽较小时，该方法也能有效地估计MPSK信号的符号速率。

Symbol rate estimation method of MPSK signals based on cyclic spectrum

Aiming at the practical application of spectrum sensing, this paper studies the cyclic spectrum characteristics of MPSK signals which filtered by pulse shaping filter based on the cyclic stationary theory. By analyzing the affect of excess bandwidth to cyclic spectrum estimation, a symbol rate estimation algorithm which combines constant amplitude processing with spectrally smoothed cyclic periodogram is provided .Simulation result shows that the proposed algorithm can achieve good performance for limited data length, and even when excess bandwidth is small, the algorithm can estimate the symbol rate efficiently.