NDLI: Blind startup of MMSE receivers for CDMA systems

Content Provider	IEEE Xplore Digital Library
Author	Ruifeng Zhang Tsatsanis, M.K.
Copyright Year	1991
Abstract	This paper presents a novel technique for blindly starting up a minimum-mean-squared-error (MMSE) receiver for a user newly entering a code-division multiple-access (CDMA) system. It is assumed that only one user at a time is admitted into the system and that data before and after the onset of the new transmission are available. The technique is based on the generalized eigendecomposition of the two corresponding autocorrelation matrices (before and after the new user is admitted). In general, the two autocorrelation matrices differ by a low-rank matrix contributed by the autocorrelation of the new user signal. This fact yields the useful property that the generalized eigenvectors corresponding to the minimum eigenvalue span the noise subspace of the low-rank signal term. Exploiting this subspace relation, the signature of the new user can be identified. If, in particular, the difference between the two autocorrelation matrices is exactly a rank-one matrix, then there is only one maximum eigenvalue, and the corresponding eigenvector coincides with the MMSE receiver corresponding to the rank-one signal term. These properties are also applicable to long-code CDMA systems to provide an optimal multipath combining method.
Sponsorship	IEEE Signal Processing Society
Starting Page	1492
Ending Page	1500
Page Count	9
File Size	214497
File Format	PDF
ISSN	1053587X
Volume Number	49
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Autocorrelation Eigenvalues and eigenfunctions Multiuser detection Training data Constraint optimization Maximum likelihood detection Interference cancellation Robustness Performance gain
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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