WSEAS Transactions on Communications
Print ISSN: 1109-2742, E-ISSN: 2224-2864
Volume 14, 2015
Iterative Doppler Shift Estimation in Radio Propagation
Authors: ,
Abstract: This paper analyzes the bias of a Doppler shift estimator based on adaptive autocorrelation function (ACF) computations and proposes a process for reduction the bias of estimation at high speed movements. Furthermore, a signal-to-noise ratio (SNR) estimator is proposed according to the varying bias in the iterations, where the estimates of the Doppler shift in the first and the final stages of iteration are merged to construct a bias ratio related to the SNR. Simulations show the proposed algorithm achieves accurate estimation within a wide range of velocities and SNRs.