LMS adaptive filtering with /spl Sigma//spl Delta/ modulated input signals

A new multibit multiplier free structure for a least mean squares (LMS) algorithm with /spl Sigma//spl Delta/ modulated input signals is proposed. An additional filter in the error path is necessary to allow adaptation of the filter. Simulation results for system identification demonstrate that the performance of described design is comparable to the performance of an equivalent pulse code modulated (PCM) system.