Blind adaptive algorithms for minimum variance CDMA receivers

Constrained optimization methods have received considerable attention as a means to derive blind multiuser receivers with low complexity. The receiver's output variance is minimized subject to appropriate constraints which depend on the multipath structure of the signal of interest. When multip...

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Veröffentlicht in:IEEE transactions on communications Jg. 49; H. 1; S. 180 - 194
Hauptverfasser: Zhengyuan Xu, Tsatsanis, M.K.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.01.2001
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Adaptive algorithm
Adaptive algorithms
Blinds
Constraint optimization
Constraints
Equations
Frequency
Interference constraints
Interference suppression
Least squares method
Mathematical analysis
Multiaccess communication
Multiuser detection
Optimization
Optimization methods
Receivers
Stochastic processes
Variance
ISSN:0090-6778, 1558-0857
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Zusammenfassung:Constrained optimization methods have received considerable attention as a means to derive blind multiuser receivers with low complexity. The receiver's output variance is minimized subject to appropriate constraints which depend on the multipath structure of the signal of interest. When multipath is present, the constraint equations can be written in parametric form, and the constraint parameters jointly optimized with the linear receiver's parameters. We develop adaptive solutions for this joint, constrained optimization problem. Both stochastic gradient and recursive least-square-type algorithms are developed. The performance of the proposed methods is compared with other blind and trained methods and turns out to be close to the trained minimum mean-square-error receiver.
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ISSN:0090-6778
1558-0857
DOI:10.1109/26.898261