NDLI: Convergence analysis of LMS multiuser CDMA detectors

Content Provider	IEEE Xplore Digital Library
Author	Teng Joon Lim Yu Gong Farhang-Boroujeny, B.
Copyright Year	1999
Description	Author affiliation: Centre for Wireless Commun., Singapore (Teng Joon Lim)
Abstract	The convergence behaviour of the LMS CDMA multiuser detector is of great interest both in practice and in theory. The sampling rate for the tap-input of a LMS detector may be equal to or higher than the chip rate, and these correspond to chip-spaced (CS) and fractionally-spaced (FS) detection, respectively. It is shown in this paper that CS and FS detectors with the same time-span exhibit identical convergence behaviour, if the baseband received signal is strictly bandlimited to half the chip rate. Even in the practical case when this condition is not met, deviations from this observation are imperceptible unless the initial tap-weight vector gives an extremely large mean squared error (MSE). The inadequacy of the eigenvalue spread of the tap-input correlation matrix as an indicator of transient behaviour, and the influence of the initial tap weight vector on convergence speed, are highlighted. Specifically, initialization within the signal subspace or to the origin leads to very much faster convergence compared to initialization in the noise subspace.
Starting Page	75
Ending Page	79
File Size	528417
Page Count	5
File Format	PDF
ISBN	0780356683
ISSN	15253511
DOI	10.1109/WCNC.1999.797789
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-09-21
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Convergence Least squares approximation Multiaccess communication Detectors Eigenvalues and eigenfunctions Adaptive filters Wireless communication Sampling methods Baseband Multiuser detection
Content Type	Text
Resource Type	Article

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