Patent ID: 7756196
Filing Date: 2010-07-13
Classification: H04B,H04J

Abstract:
1. A communication system, comprising: a receiver having an adaptive filter coupled to receive an input signal comprising a plurality of user signals and a pilot signal, the input signal characterized by an orthogonal code modulation, wherein the adaptive filter has a matched filter stage that filters at least a portion of the input signal, wherein the adaptive filter has a prestage filter that filters the input signal using a level of precision lower than the matched filter stage and identifies a set of filter elements within the matched filter stage, and wherein the matched filter stage filters at least a portion of the input signal using the set of filter elements identified by the prestage filter and wherein the prestage filter and the matched filter stage each determines a set of filter coefficients using a cross correlation between at least a portion of the input signal and a reference signal generated by the receiver, using an integration for an integer number of two or more complete orthogonal code periods in the respective cross correlations, the adaptive filter filtering at least a portion of the input signal in the matched filter stage and in at least one other adaptive multistage filter stage, the matched filter stage and the at least one other adaptive multistage filter stage receiving the at least a portion of the input signal in parallel.