Patent ID: 6363103
Filing Date: 2002-03-26
Classification: H04B

Abstract:
A method of decoding a spread spectrum composite signal, said composite signal comprising a plurality of user signals that have been modulated using M-ary orthogonal signals and spread with a plurality of respective codes, said method comprising a plurality of interference cancellation steps performed in succession in response to an input cancellation residue signal and input weight signals corresponding to preceding estimated correlation signals of said users to said M-ary orthogonal signals wherein each successive step comprises the performance for each one of said user signals of the following substeps:despreading said input cancellation residue signal to generate a despread input cancellation residue signal; correlating said despread input cancellation residue signal with said M-ary orthogonal signals to generate a first correlation signal; adding said first correlation signal to an input weight signal for said user to generate a second correlation signal; operating on said second correlation signal with a decision function to generate an output weight signal for said user; performing an inverse transform of said output weight signal for said user to reconstruct said user signal; and spreading said user signal to generate an estimate of a portion of said composite signal for said user.