基于小波变换的MPSK信号符号速率估计算法

Symbol Rate Estimation Algorithm for MPSK Signal Based on Wavelet Transform

在非合作MPSK信号调制方式识别和盲解调过程中,符号速率的估计是一个重要环节。本文根据morlet小波函数的时频特征以及MPSK信号的时频分布,提出了一种基于morlet小波变换的MPSK信号符号速率估计算法。仿真结果表明,与现有算法相比,该算法对载频估计误差不敏感,具有更低的信噪比门限,也更逼近CRLB曲线。

The symbol rate estimation is an important process for non-cooperation MPSK signal modulation identification＇ and blind demodulation. In this paper, according to the time-frequency distributions of morlet wavelet and MPSK signal, a symbol rate estimation algorithm is proposed based on the morlet wavelet transform. rithm has lower sensitivity to carrier frequency Simulation results demonstrate that the algoestimation error and lower SNR threshold than the existed algorithms. Thus it approaches more closely to the theoretical cramer-rao lower bound （CRLB）.