Iterative multiuser detection and decoding for DS-CDMA system with space-time linear dispersion

Pei Xiao, Jinsong Wu, Mathini Sellathurai, T. Ratnarajah, Erik G. Strom

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

This paper considers a Q-ary orthogonal direct-sequence code-division multiple-access (DS-CDMA) system with high-rate space-time linear dispersion codes (LDCs) in time-varying Rayleigh fading multiple-input-multiple-output (MIMO) channels. We propose a joint multiuser detection, LDC decoding, Q-ary demodulation, and channel-decoding algorithm and apply the turbo processing principle to improve system performance in an iterative fashion. The proposed iterative scheme demonstrates faster convergence and superior performance compared with the V-BLAST-based DS-CDMA system and is shown to approach the single-user performance bound. We also show that the CDMA system is able to exploit the time diversity offered by the LDCS in rapid-fading channels.

Original languageEnglish
Pages (from-to)2343-2353
Number of pages11
JournalIEEE Transactions on Vehicular Technology
Volume58
Issue number5
Early online date31 Oct 2008
DOIs
Publication statusPublished - Jun 2009

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