NDLI: Differential MMSE: a framework for robust adaptive interference suppression for DS-CDMA over fading channels

Content Provider	IEEE Xplore Digital Library
Author	Madhow, U. Bruvold, K. Liping Zhu
Copyright Year	1972
Abstract	The linear minimum mean-squared error (MMSE) criterion is known to provide adaptive algorithms for interference suppression in direct-sequence (DS) code-division multiple-access (CDMA) systems. However, standard MMSE adaptation is not robust to fast fading, being unable to compensate for rapid channel variations. In this paper, we provide a framework for deriving robust adaptive algorithms in this setting based on a new differential MMSE (DMMSE) criterion, which is a constrained optimization problem in which the quantity to be tracked is the ratio of the data appearing in two successive observation intervals. When applied to a DS-CDMA system with short spreading waveforms (i.e., with period equal to the symbol interval) operating over a flat-fading channel, the DMMSE criterion avoids tracking the fades, exploiting the negligible variation of the fading gain over two consecutive symbols. For frequency-selective fading, the DMMSE criterion is extended to provide a new eigenrake receiver which provides interference suppression and diversity combining without requiring explicit information regarding the desired user's propagation channel.
Starting Page	1377
Ending Page	1390
Page Count	14
File Size	605338
File Format	PDF
ISSN	00906778
Volume Number	53
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Robustness Interference suppression Multiaccess communication Fading Adaptive algorithm Multiple access interference Correlators Frequency diversity Diversity reception Time-varying channels near–far problem Adaptive equalization code-division multiple access (CDMA) differential minimum mean-squared error (DMMSE) fading channels interference suppression multiuser detection
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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