NDLI: Adaptive multi-user detection of fading CDMA channels using antenna arrays

Content Provider	IEEE Xplore Digital Library
Author	Papadias, C. Huang, H. Mailaender, L.
Copyright Year	1998
Description	Author affiliation: Bell Labs., Lucent Technol., Holmdel, NJ, USA (Papadias, C.)
Abstract	We consider the problem of detecting a number of short-code CDMA signals that impinge (bit-) synchronously on the antenna array of a base station (reverse link). The signals are assumed to be corrupted by both multipath fading and multiple access interference (MAI). To boost performance (measured either in BER for each user or in user capacity), we are interested in using jointly for the signal detection three key signal detection technologies: (1) RAKE processing, (2) array processing, and (3) multi-user detection. The resulting space-time multi-user detectors (ST-MUDs) have been shown in previous works to offer significant improvements over previously existing techniques. In this paper we focus on a specific type of linear detector presented by Huang and Papadias (see Proc. 1998 PIMRC Conference, Boston, 1998), which has been shown to combine good performance with implementation advantages. We propose to update this linear detector with adaptive filtering algorithms, and in particular with stochastic-gradient type trained or blind algorithms. It is shown that, such simple techniques allow the receiver to approach the ST-MUD MMSE solution and achieve significant capacity gains with respect to conventional techniques.
Starting Page	1564
Ending Page	1568
File Size	530755
Page Count	5
File Format	PDF
ISBN	0780351487
ISSN	10586393
DOI	10.1109/ACSSC.1998.751589
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-11-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiuser detection Fading Multiaccess communication Adaptive arrays Detectors Multiple access interference Signal detection Filtering algorithms Antenna arrays Base stations
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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