Apparatus and method for adaptively filtering a time-varying...

Details Apparatus and method for adaptively filtering a time-varying... Apparatus and method for adaptively filtering a time-varying...

H - Electricity

03

H

H03H 21/00 (2006.01) H04B 1/10 (2006.01) H04B 1/16 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2076997

The present invention presents an apparatus and method for recovering symbols in a data packet (101) transmitted to a receiver (201) from a remote signal source (202) in a time-varying channel using multiple adaptive filtering algorithms. The symbols in the data packet (101) are recovered using an adaptive filter 203 responsive to a recursive least squares (RLS) filtering algorithm followed by a least-mean squares (LMS) filtering algorithm. The RLS filtering algorithm is used first for its fast training and fast recovery characteristics. The LMS filtering algorithm is used second for its low complexity and high stability characteristics. The switch between the RLS and the LMS filtering algorithms may be at a fixed point in time to ensure minimal filter complexity or may be adaptive responsive to the quality of an error signal (ek) processed in a coefficient determinator (307 or 309) to ensure maximum bit error rate performance and stability.

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