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Large-System Analysis of Joint Channel and Data Estimation for MIMO DS-CDMA Systems
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.
2012 (English)In: IEEE Transactions on Information Theory, ISSN 0018-9448, Vol. 58, no 3, 1385-1412 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents a large-system analysis of the performance of joint channel estimation, multiuser detection, and per-user decoding (CE-MUDD) for randomly spread multiple-input multiple-output (MIMO) direct-sequence code-division multiple-access (DS-CDMA) systems. A suboptimal receiver based on successive decoding in conjunction with linear minimum mean-squared error (LMMSE) channel estimation is investigated. The replica method, developed in statistical mechanics, is used to evaluate the performance in the large-system limit, where the number of users and the spreading factor tend to infinity while their ratio and the number of transmit and receive antennas are kept constant. Joint CE-MUDD based on LMMSE channel estimation is compared to several methods of one-shot channel estimation, i.e., methods that do not utilize decoded data symbols to refine the initial channel estimates, in terms of spectral efficiency. Joint CE-MUDD is found to significantly reduce the rate loss caused by transmission of pilot signals when compared to the receivers based on one-shot channel estimation. This holds particularly for multiple-antenna systems. As a result, joint CE-MUDD can provide significant performance gains compared to the receivers based on one-shot channel estimation.

Place, publisher, year, edition, pages
2012. Vol. 58, no 3, 1385-1412 p.
Keyword [en]
Channel estimation, direct-sequence code-division multiple-access (DS-CDMA) schemes, iterative receivers, large-system analysis, linear minimum mean-squared error (LMMSE) estimation, multiple-input multiple-output (MIMO) systems, multiuser detection (MUD), replica method, statistical mechanics, successive decoding
National Category
Signal Processing Telecommunications
URN: urn:nbn:se:kth:diva-77850DOI: 10.1109/TIT.2011.2177757ISI: 000300845900009ScopusID: 2-s2.0-84863229510OAI: diva2:492140
ICT - The Next Generation

QC 20120801

Available from: 2012-02-07 Created: 2012-02-07 Last updated: 2013-04-11Bibliographically approved

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