NDLI: Multiuser detectors for synchronous CDMA communication over non-selective Rician fading channels

Content Provider	IEEE Xplore Digital Library
Author	Varanasi, M.K. Vasudevan, S.
Copyright Year	1972
Abstract	Synchronous code division multiple access (CDMA) data transmission over a non-selective Rician fading channel is considered, where the faded signal components arrive at the receiver in synchronism with the specular signal component. Under the assumption that the fading parameters are uncorrelated, this fading CDMA channel is shown to be equivalent to a Gaussian CDMA channel over which a modified signal set is employed. A fading counterpart of the multiuser asymptotic efficiency performance measure is defined. The asymptotic efficiencies of the optimum, decorrelating, and conventional detectors designed for the fading channel are derived. The conventional detector, which has low complexity, is shown to degrade rapidly in near-far environments. The optimal detector for the fading channel exhibits a significant improvement in performance but at the price of a computational complexity that increases exponentially with the number of users. The linear decorrelating detector for the fading case is optimally near-far resistant. The asymptotic efficiencies of multiuser detectors designed for the Gaussian channel when employed over the Rician fading channel are also obtained, thereby quantifying the loss in performance incurred by these mismatched detectors.<>
Starting Page	711
Ending Page	722
Page Count	12
File Size	1211060
File Format	PDF
ISSN	00906778
Volume Number	42
Issue Number	234
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Code division multiplexing Fading Multiaccess communication Rician channels Decorrelation Data communication Degradation Computational complexity Gaussian channels
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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