相位编码信号码速率估计的最优小波尺度选择

Optimal Scale Choosing of PSK Signal Symbol Rate Estimation Based on Wavelet Transform

研究了小波变换应用于相位编码信号码速率估计的尺度选择问题,提出了一种最优小波尺度选择方法。以相位跳变的最佳检测为依据建立了最优小波尺度选择函数,然后结合功率谱平滑载频估计和信号编码形式完成最优小波尺度的选取,最后通过叠加模值频谱完成信号码速率估计。仿真实验表明,所提出的尺度选择方法将二相编码信号和四相编码信号的码速率估计信噪比门限分别降低了1 d B和3 d B。

The problem of choosing optimal wavelet scale in the phase shift keying（ PSK） signal symbol rate estimation is studied. An optimal wavelet scale choosing method is proposed. According to the optimum de-tection of phase jump between the symbols in the PSK signal,the optimal wavelet scale choosing function is established. And then,based on the coded type of signal and the carrier frequency derived from smoothness power spectrum,the optimal wavelet scales are chosen. Finally,the spectrum of the optimal scale wavelet transform accumulated modulus is employed to realize the symbol rate estimation. Simulation results demon-strate that the proposed wavelet scale choosing method ＇ s signal-to-noise ratio （ SNR ） threshold of binary phase shift signal and quadrature phase shift signal has been reduced by 1 dB and 3 dB,respectively.