Blind Doppler parameters estimation of QAM signals based on cyclic-statistical tests
Hua Feng Peng · Journal of Circuits and Systems · 2012
Aiming at the difficulties of blind Doppler parameters estimation for QAM signals in SCOTM(Satellite Communication on-the-move),a blind estimation algorithm based on cyclic-statistical tests is proposed.The algorithm obviates the need for preprocessing tasks,such as symbol timing recovery and matched filtering.By detecting one of the cyclic frequencies of QAM signals,located at the quartic frequency offset,Doppler frequency is effectively estimated,meanwhile,the data division method is exploited to calculate the Doppler-rate.Experimental results indicate that the novel algorithm can accomplish blind Doppler parameters estimation effectively and accurately in AWGN channel and fading channel under low SNRs.