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Performance analysis of optimal channel estimation and multiuser detection in a randomly-spread CDMA channel
University of Electro-Communications, Department of Communication Engineering and Informatics.
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
Department of Systems Science, Kyoto University.
Norwegian University of Science and Technology, Department of Electronics and Telecommunications.
2010 (English)In: Journal of Systems Science and Complexity, ISSN 1009-6124, E-ISSN 1559-7067, Vol. 23, no 1, 22-34 p.Article in journal (Refereed) Published
Abstract [sv]

This paper analyzes performance of optimal channel estimation and multiuser detection (MUD) in a block-fading code-division multiple-access (CDMA) channel on the assumptions of random spreading and large-system limit, by using the replica method developed in statistical mechanics. The authors find that the asymptotic spectral efficiency of the linear minimum mean-squared error (LMMSE) MUD which was proposed and analyzed by Evans and Tse in 2000 is indistinguishable from that of the optimal MUD for small system loads. Our results imply that performance of MUD scarcely improves even if one spends more computational cost than that of the LMMSE MUD, i.e., at most the cube of the number of users, on the above-described conditions

Place, publisher, year, edition, pages
2010. Vol. 23, no 1, 22-34 p.
Keyword [en]
Channel estimation, code-division multiple-access (CDMA) systems, multiuser detection, replica method, spectral efficiency
National Category
Signal Processing Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-46553DOI: 10.1007/s11424-010-9278-zISI: 000274950400003OAI: oai:DiVA.org:kth-46553DiVA: diva2:491602
Note

QC 20120207

Available from: 2012-02-06 Created: 2011-11-03 Last updated: 2017-12-08Bibliographically approved

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