초록 ▼

A method and receiver which provides, among other features, for resubtraction of an already subtracted signal in order to eliminate subtraction errors, termed re-orthogonalization, is described herein. According to exemplary embodiments, pairwise combinations of spreading codes are used to despread

A method and receiver which provides, among other features, for resubtraction of an already subtracted signal in order to eliminate subtraction errors, termed re-orthogonalization, is described herein. According to exemplary embodiments, pairwise combinations of spreading codes are used to despread received composite signals. For example, these pairwise combinations can include a first spreading code associated with a signal that has already been subtracted and a second spreading code associated with a signal which is weaker than that associated with the first spreading code. In this way both resubtraction and subtraction are performed at the same time.

대표청구항 ▼

[ What is claimed is:] [23.] A receiver for receiving a multiplicity of overlapping spread-spectrum signals and decoding at least one of said overlapping spread-spectrum signals comprising:receiving means for producing an intermediate frequency signal;code generator means for providing replicas of s

[ What is claimed is:] [23.] A receiver for receiving a multiplicity of overlapping spread-spectrum signals and decoding at least one of said overlapping spread-spectrum signals comprising:receiving means for producing an intermediate frequency signal;code generator means for providing replicas of spreading codes used by said overlapping signals;despreading means for despreading said intermediate frequency signal with a first of said spreading code replicas to obtain a despread signal;filtering means for removing signal energy of a first of said overlapping spread-spectrum signals spread with said first spreading code from said despread signals to leave a first residual signal in which a total energy associated with others of said overlapping spread-spectrum signals remains substantially unaffected;respreading means for respreading said first residual signal using said first spreading code-replica to obtain a first respread signal;additional despreading, filtering and respreading means using other of said code replicas for removing energy associated with other signals from said first residual signal to obtain a second residual signal; andresubtraction means comprising despreading, filtering and respreading means using said first spreading code replica to remove from said second residual signal energy associated with said first signal to produce an output signal.