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A Low-Complexity Iterative Receiver for Multiuser Space-Time Coding Systems

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3 Author(s)
Yang, Y. ; Dept. of Electr. Eng., Saskatchewan Univ., Saskatoon, Sask. ; Nguyen, H.H. ; Shwedyk, E.

Iterative processing has been shown to be very effective in multiuser space-time block coding (STBC) systems, where each user employs channel coding and iterations are performed between the soft-output multiuser detector and the soft-input soft-output channel decoders. The complexity of an iterative receiver depends heavily on how the log-likelihood ratios (LLRs) are computed for users' coded bits in order to implement the iterations. The use of sigma mapping for M-QAM constellations is proposed in this paper to ease the computation of the LLRs and allow bit-level interference cancellation in the iterative processing. It is demonstrated that the proposed iterative receiver performs very close to the conventional one, but with a much less computational complexity

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Communications, 2006 23rd Biennial Symposium on

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