An improved parametric estimator of Doppler shift in mobile communications

摘要

This paper investigates biases of a parametric estimator of Doppler shift in mobile communications, and the result indicates that the conventional iterative autocorrelation function (ACF) estimator yields a significant estimation error at high mobile speeds. Therefore, a simple linear fitting is proposed to refine the Doppler shift estimation, in which only one fitting expression is required for different signal-to-noise ratios (SNR), i.e., the refining process is insensitive to the actual SNR. The reason is that that different SNRs lead to nearly the same estimates at the high speed scenario. Sufficient computer simulations show that our proposed algorithm achieves accurate estimates for both the SNR and Doppler shift.