A hybrid method for Doppler spread estimation [mobile radio systems]

The Doppler spread estimator presented in this paper solves some problems encountered in some of the previously published solutions. The algorithm consists of two steps, both using the channel autocorrelation function. The first step is a coarse estimate, based on the sign change of the autocorrelation function. Depending on the coarse estimate, either a polynomial fit method (for low Doppler spreads) or a first zero detection method (for high Doppler spreads) is applied. The proposed hybrid Doppler spread estimator provides high estimation accuracy for a wide range of Doppler spreads.