Speed estimation in wireless systems using wavelets

A new technique is described for estimating the speed of a mobile station i n a wireless system. The mobile speed maps the characteristic spatial scale of the received signal into a characteristic temporal scale. The continuou s wavelet transform tracks changes in the temporal scale to estimate the mo bile speed as a function of time. This technique requires neither knowledge of the average received power of the nonstationary signal nor adaptation o f a temporal observation window, in contrast to other speed estimators give n in the literature. Simulations show the tracking of a variable speed prof ile.