Replica analysis of general multiuser detection in MIMO DS-CDMA channels with imperfect CSI

Keigo Takeuchi, Mikko Vehkaperä, Toshiyuki Tanaka, Ralf R. Muller

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

6 Citations (Scopus)

Abstract

We consider impacts of channel estimation errors on performance of general multiuser detectors in MIMO DS-CDMA channels. We evaluate their performance in terms of asymptotic spectral efficiency, which is obtained via decoupling structure, by using the replica method. Numerical results imply that the performance of LMMSE detection is very close to that of MMSE detection for small system loads. Furthermore, we find that the spectral efficiency of MMSE detection grows discontinuously with the length of pilot sequences for large system loads, and that the critical length is close to the optimal length. While it is indistinguishable from that of LMMSE detection for short pilot sequences, the gap between the two is significantly large if the length of pilot sequences is longer than the critical length.

Original languageEnglish
Title of host publication2008 IEEE International Symposium on Information Theory, ISIT 2008
PublisherIEEE Institute of Electrical and Electronic Engineers
Pages514-518
ISBN (Electronic)978-1-4244-2257-9
ISBN (Print)978-1-4244-2256-2
DOIs
Publication statusPublished - 29 Sep 2008
MoE publication typeA4 Article in a conference publication
Event2008 IEEE International Symposium on Information Theory, ISIT 2008 - Toronto, ON, Canada
Duration: 6 Jul 200811 Jul 2008

Publication series

SeriesIEEE International Symposium on Information Theory. Proceedings
Volume2008
ISSN2157-8095

Conference

Conference2008 IEEE International Symposium on Information Theory, ISIT 2008
CountryCanada
CityToronto, ON
Period6/07/0811/07/08

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Takeuchi, K., Vehkaperä, M., Tanaka, T., & Muller, R. R. (2008). Replica analysis of general multiuser detection in MIMO DS-CDMA channels with imperfect CSI. In 2008 IEEE International Symposium on Information Theory, ISIT 2008 (pp. 514-518). [4595039] IEEE Institute of Electrical and Electronic Engineers . IEEE International Symposium on Information Theory. Proceedings, Vol.. 2008 https://doi.org/10.1109/ISIT.2008.4595039