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Iterative channel estimation, detection, and decoding in large CDMA systems
Dept. Electronics and Telecommunications, Norwegian University of Science and Technology.
University of Electro-Communications, Department of Communication Engineering and Informatics.
Norwegian University of Science and Technology, Department of Electronics and Telecommunications.
Department of Systems Science, Kyoto University.
2010 (English)In: 6th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2010, 2010, 16-23 p.Conference paper (Refereed)
Abstract [en]

The large system analysis of randomly spread direct-sequence code-division multiple-access systems operating over frequency-selective fading channels is considered. Iterative multiuser detection and decoding (MUDD) based on generalized posterior mean estimation and single-user sum-product decoding is assumed to be used at the receiver. The channel state information (CSI) at the MUDD is mismatched and obtained by a linear channel estimator whose initial decisions are iteratively refined with the help of information feedback provided by the MUDD. Furthermore, a new training method by means of probability-biased signaling is proposed. The results indicate that in the large system limit and under certain threshold loads, a near single-user performance with perfect CSI can be achieved using a vanishing training overhead. It is also found that for the considered setups, the iterative linear minimum mean square error based channel estimator is near optimal for relatively slowly time-varying multipath fading channels.

Place, publisher, year, edition, pages
2010. 16-23 p.
National Category
Telecommunications Signal Processing
URN: urn:nbn:se:kth:diva-78616DOI: 10.1109/ISTC.2010.5613863ScopusID: 2-s2.0-78649294570ISBN: 978-1-4244-6745-7OAI: diva2:492689
6th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2010. Brest. 6 September 2010 - 10 September 2010
QC 20120209Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2012-02-09Bibliographically approved

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Vehkaperä, Mikko
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