IF-Based Velocity Estimation of the Mobile Units in Micro-Cellular Systems with Non-Isotropic Scattering Distribution

Accurate estimates of the velocity of a mobile station are necessary for improving the performance of the wireless communication systems. This paper presents a new approach for estimating the velocity of a mobile station, or equivalently the maximum Doppler frequency shift, in a typical micro-cellular system with non-isotropic scattering. The proposed estimators use the instantaneous frequency of the received signal at the MS antenna. Unlike the existing velocity estimators, the proposed estimator is unbiased when the scattering distribution is nonisotropic and is robust to path-loss and shadowing.