一种小波变换与FFT相结合的波特率估计新算法

小波变换具有局部显微特性，对信号的瞬时特性具有较强的捕获能力。从连续小波变换的定义出发，分析了PSK、FSK、QAM信号的小波域特征，并结合传统的FFT理论提出了一种波特率提取的新算法。对高斯白噪声中PSK、FSK、QAM信号的波特率提取进行了仿真试验，仿真结果表明，在信噪比大于1dB情况下该算法能有效地提取出PSK、FSK、QAM信号的波特率。

A New Kind of Arithmetic for Baud-Rate Estimation with Combination of Wavelet Transform and FFT

Wavelet transform has the characteristic of local microscope, so it has great capability of capturing the instantaneous character of signals. Begin with the definition of continuous wavelet transform, the wavelet domain character of PSK?FSK and QAM signals is analyzed, and a new kind of baud-rate extraction arithmetic is brought forward in this paper. The emulation experiment of this arithmetic's performance for PSK?FSK and QAM signals in the background of white gauss noise is performed, and the results indicate that this method can effectively extract the symbol rate of PSK?FSK and QAM signals when S/N greater than 1dB.