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Gaussian approximation based mixture reduction for near optimum detection in MIMO systems

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)997 - 999
Number of pages3
JournalIEEE Communications Letters
Journal issue11
StatePublished - Nov 2005


The optimal "soft" symbol detection for spatial multiplexing multiple input multiple output (MIMO) system with known channel information requires knowledge of the marginal posterior symbol probabilities for each antenna. The calculation of these quantities requires the evaluation of the likelihood function of the system for all possible symbol combinations, which is prohibitive for large systems. It is however most often the case that most of the transmitted symbol combinations contribute only very little to these marginal posterior probabilities. We propose in this paper a suboptimal procedure which identifies the most significant symbol combinations via a sequential algorithm with Gaussian Approximation (SGA). Simulation results show that our method can approach the optimal a posteriori probability detector (APP) performance while being less complex than comparable suboptimal algorithms, such as the sphere decoder (SD). We further demonstrate that as opposed to the SD the complexity and memory requirements of our algorithm are fixed, therefore easing practical implementation

Additional information

Publisher: IEEE-Inst Electrical Electronics Engineers Inc Other identifier: IDS Number: 982FG Rose publication type: Journal article Sponsorship: The authors wish to thank Toshiba TREL Bristol UK for sponsoring the work presented in this paper and Dr. Mong Suan Yee for helpful discussions concerning the SD Terms of use: Copyright © 2005 IEEE. Reprinted from IEEE Communications Letters. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

    Research areas

  • space-time processing, multiuser detection, Gaussian approximation, probability data association

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