US 7,613,228 B2 · M-Algorithm multiuser detector with correlation based pruning

Abstract

A multiuser detector system with correlation based pruning including a parameter estimation module adapted to receive complex signals, and to produce estimated signature waveforms for each of K co-channel interfering signals. Pre-processing the estimated signature waveforms using an S-matrix module and producing a more valid set of hypotheses, wherein the S-matrix module uses apriori knowledge of an unnormalized cross correlation matrix, and processing the more valid set of hypotheses for pruning with an M-algorithm in a multiuser detector module. An improvement to the M-algorithm in which the interference structure based on the signal correlation matrix used during the optimization process aids in selecting a better subset of hypotheses to test. This approach has the benefit of reducing computational complexity and improving performance over the existing M-algorithm.

Claims21

Dependent claims

A multiuser detector system with correlation based pruning, comprising:

a digital signal processor upon which is disposed;
a parameter estimation module adapted to receive complex signals, and to produce estimated signature waveforms for each of K co-channel interfering signals;
an S-matrix module forming an S-Matrix from said estimated signature waveforms;
and
a multiuser detector module processing said S-Matrix of said estimated signature waveforms with an unnormalized cross correlation matrix, and producing a more valid set of hypotheses for pruning with an M-algorithm.

2 more elements

Dependencies are inferred from the claim text.

M-Algorithm multiuser detector with correlation based pruning

Life of this patent

M-Algorithm multiuser detector with correlation based pruning

Life of this patent

Abstract

Claims21