Blind symbol rate estimation of MPSK signals based on multi-scale Haar wavelet transform
Yü Liu · Systems engineering and electronics · 2008
The symbol rate estimation of multi-phase shift keying(MPSK) signals and a method of blind symbol rate estimation of MPSK signals based on multi-scale Haar wavelet transform are presented. The FFT of received signals is applied to smooth the spectrum, then the center frequency is estimated. A correlation receiver can be designed with the estimated frequency. Then the 3 dB bandwidth of signal is estimated to choose three wavelet scales according to signal bandwidth. Detect the jump of phase of the output of the receiver with multi-scale Haar wavelet. The results of the multi-scale analysis are accumulated to improve the estimation performance. Fourier transform is applied to extract periodicity from the resultant WT magnitude. The results show when the SNR is higher than SNR threshold the method can estimate the symbol rate of MPSK effectively.