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Low Complexity Receiver Structures for Space-Time Coded Multiple-Access Systems

Abstract

Multiuser detection for space-time coded synchronous multiple-access systems in the presence of independent Rayleigh fading is considered. Under the assumption of quasi-static fading, it is shown that optimal (full diversity achieving) space-time codes designed for single-user channels, can still provide full diversity in the multiuser channel. The joint optimal maximum likelihood multiuser detector, which can be implemented with a Viterbi-type algorithm, is derived for such space-time coded systems. Low complexity, partitioned detector structures that separate the multiuser detection and space-time decoding into two stages are also developed. Both linear and nonlinear multiuser detection schemes are considered for the first stage of these partitioned space-time multiuser receivers. Simulation results show that these latter methods achieve performance competitive with the single-user bound for space-time coded systems.

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Correspondence to Sudharman K. Jayaweera.

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Jayaweera, S.K., Poor, H.V. Low Complexity Receiver Structures for Space-Time Coded Multiple-Access Systems. EURASIP J. Adv. Signal Process. 2002, 581610 (2002). https://doi.org/10.1155/S111086570200063X

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Keywords

  • multiuser detection
  • space-time coding
  • iterative detection