一种基于频率校正的BPSK信号高精度载频估计算法

High-accuracy carrier frequency estimation algorithm based on frequency correction for BPSK signal

为了实现BPSK信号载频的高精度估计,提出一种基于频率校正的高精度BPSK信号载频估计算法。算法通过非线性变换将BPSK信号的载频估计问题转化为对点频信号的估计,再用DFT对点频信号进行粗估计,针对DFT估计频率分辨率差的问题,采用相位差校正法对DFT估计频率进行校正,从而实现BPSK信号载频的高精度估计。最后,通过性能分析和计算机仿真验证了算法的有效性,其结果表明:该算法在低信噪比情况下能获得较好的估计精度,在高信噪比情况下,估计精度大幅提高。

In order to realize the high-accuracy estimation for BPSK signal carrier frequency, a high-accuracy carrier frequency estimation algorithm based on frequency correction for BPSK signal is proposed in this paper, in which the carrier fre- quency estimation of BPSK signal was transformed into single-tone frequency estimation by nonlinear transformation, and the dot frequency signals are roughly estimated. According to the problem of poor resolution ratio of DFP estimation frequency, the phase difference correcting method is used to correct the DFT estimation frequency and achieve the high-accuracy carrier fre- quency estimation of BPSK signal. The validity of the algorithm was verified by performance analysis and computer simulation. The results indicate that the algorithm can acquire high estimation accuracy in the case of low SNR and improve the accuracy ef- fectively in the case of high SNR.