Patent ID: 6868276

Claim:
A method for use by a receiver ( 23 ) of a wireless communication system in providing information for use in adapting to changing characteristics of a communication channel ( 22 ) over which the receiver ( 23 ) receives a signal at a carrier frequency, the receiver ( 23 ) having a local oscillator oscillating at a local frequency initially tuned to a frequency suitable for receiving the carrier frequency, the method characterized by: a step ( 23 b - 1 b 23 b - 2 b ), responsive to received signal samples extracted from the received signal and corresponding to transmitted symbols, of providing estimates of autoregressive parameters representing the changing communication channel ( 22 ) based on a predetermined parametric model of how as a result of stochastic processes the communication channel ( 22 ) changes over time; and a step ( 23 b - 1 c 23 b - 2 c ), responsive to the estimated values of the autoregressive parameters, of providing an estimate of the channel impulse response and an estimate of a frequency offset of at least one multipath signal.