M(K)], K is a parameter that determines the delay-extent of the equalizer filter, and r _ _ ??? ( n ) = [ r _ ??? ( n + k ) ??? r _ ??? ( n ) ??? r _ ??? ( n - K ) ] . [0224] The sequence of weight matrices M(k) is selected to minimize the mean-square error. [0225] The MMSE solution can then be stated as the sequence of weight matrices M(k) that satisfy the linear constraints: ??? k = - K K ??? M