C. Tepedelenlioglu et Gb. Giannakis, On velocity estimation and correlation properties of narrow-band mobile communication channels, IEEE VEH T, 50(4), 2001, pp. 1039-1052
Estimation of the maximum Doppler spread or, equivalently, the vehicle velo
city, is useful in improving handoff algorithms and necessary for the optim
al tuning of parameters for systems that adapt to changing channel conditio
ns. We provide a novel velocity estimator based on the spectral moments of
the in-phase and the quadrature phase components or the envelope of the rec
eived signal. We characterize the joint effects of the Ricean K factor, the
directivity and the angle of nonisotropic scattering, and the effects of a
dditive white noise on our estimator and other covariance-based velocity es
timators analytically. We also prove the mean-square consistency of the cov
ariance-based velocity estimators under some assumptions on the angle of ar
rival distribution. Simulations illustrate our approach and compare with ex
isting techniques.