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.
Highlights
Most previous work in space-time coded systems has been concerned with single-user channels [1, 2, 3]
We have considered space-time coding for multiple-access systems in the presence of quasi-static Rayleigh fading
By analyzing the joint Maximum Likelihood (ML) receiver for space-time coded multiuser systems, we have shown that codes that achieve full
Summary
Most previous work in space-time coded systems has been concerned with single-user channels [1, 2, 3]. [4] has proposed an iterative multiuser receiver based on interference cancellation and Minimum Mean Square Error (MMSE) filtering for a space-time trellis coded CDMA system We consider both linear and nonlinear multiuser detection stages.
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