A research of fast algorithm for blind estimation of BPSK signal carrier frequency
XU Jiajia · Journal of Hubei University · 2012
A fast algorithm for blind estimation of binary phase shift keying(BPSK) signal carrier frequency was discussed.The carrier frequency and 3dB bandwidth were coarsely estimated without any prior knowledge of the received signal,and the estimation result fc and Δf3 dB were obtained.Consequently the BPSK signal was filtered with the center frequency fc and the bandwidth 4Δf3 dB.Then the filtered signal was squared,and a quasi-sinusoidal wave was obtained.Finally,the frequency of the quasi-sinusoidal wave was estimated,and half of the estimation value was the accurate estimation of BPSK carrier frequency.Analysis proved the rationality of the algorithm,and the application threshold was supplied.The simulation results showed that this algorithm could accurately estimate the carrier frequency of BPSK signal without any prior knowledge.Especially in low signal to noise ratio(SNR),the performance of the algorithm was still favorable.This algorithm was simple and the computational complexity was low,and it was convenient to be realized real-timely.