A Blind Demodulation Algorithm for BDPSK Signal Based on Wavelet Transform
Jianhua Lü · Jisuanji fangzhen · 2010
Demodulation of BDPSK signal is greatly degraded,and sometimes even can't be achieved resulted from carrier frequency estimation error of non-cooperation signal or Doppler shift under dynamic environment.A blind demodulation algorithm is proposed for BDPSK signal,which accomplishes the demodulation processing after symbol rate estimating,symbol synchronizing and symbol recognizing by mutations of wavelet module coefficients of signals.The algorithm,which does not require carrier recovery and has low sensitivity to carrier frequency estimation error,is suitable for time-varying frequency signal.The simulation result demonstrates that the algorithm has a good performance for symbol rate estimation and symbol synchronization,and the performance of blind demodulation is lower than the theory lower bound by 1.6dB.