ADAPTIVE FILTER FOR CHANNEL ESTIMATION WITH ADAPTIVE STEP-SIZE

摘要

A receiving apparatus (1) for a digital mobile communication system comprises an adaptive filter (2) for filtering an input signal. A step-size parameter (µ) chosen for the adaption of filter coefficients (w) of the adaptive filter (2) is computed from a variation of the filter coefficients (w) used by the adaptive filter (2). This enables an indirect measure for the channel variation so that a good reception quality over a wide range of user velocities is enabled in contrast to a system design based on a compromise step-size parameter (µ) being optimum for one velocity only.