Iterative channel estimation, detection, and decoding in large CDMA systems

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

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

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publication6th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2010
PublisherIEEE Institute of Electrical and Electronic Engineers
Pages16-23
ISBN (Electronic)978-1-4244-6746-4, 978-1-4244-6745-7
ISBN (Print)978-1-4244-6744-0
DOIs
Publication statusPublished - 29 Nov 2010
MoE publication typeA4 Article in a conference publication
Event6th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2010 - Brest, France
Duration: 6 Sep 201010 Sep 2010

Publication series

SeriesInternational Symposium on Turbo Codes and Iterative Information Processing
Volume6
ISSN2165-4700

Conference

Conference6th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2010
CountryFrance
CityBrest
Period6/09/1010/09/10

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    Vehkaperä, M., Takeuchi, K., Müller, R. R., & Tanaka, T. (2010). Iterative channel estimation, detection, and decoding in large CDMA systems. In 6th International Symposium on Turbo Codes and Iterative Information Processing, ISTC 2010 (pp. 16-23). [5613863] IEEE Institute of Electrical and Electronic Engineers. International Symposium on Turbo Codes and Iterative Information Processing, Vol.. 6 https://doi.org/10.1109/ISTC.2010.5613863