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    Joint source and relay optimization for two-way linear non-regenerative MIMO relay communications

    187145.pdf (210.7Kb)
    Access Status
    Open access
    Authors
    Rong, Yue
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Rong, Yue. 2012. Joint source and relay optimization for two-way linear non-regenerative MIMO relay communications. IEEE Transactions on Signal Processing. 60 (12): pp. 6533-6546.
    Source Title
    IEEE Transactions on Signal Processing
    DOI
    10.1109/TSP.2012.2213081
    ISSN
    1053-587X
    Remarks

    © 2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

    URI
    http://hdl.handle.net/20.500.11937/8512
    Collection
    • Curtin Research Publications
    Abstract

    In this paper, we investigate the challenging problem of joint source and relay optimization for two-way linear non-regenerative multiple-input multiple-output (MIMO) relay communication systems. We derive the optimal structure of the source and relay precoding matrices when linear minimal mean-squared error (MMSE) receivers are used at both destinations in the relay system. We show that for a broad class of frequently used objective functions for MIMO communications such as the MMSE, the maximal mutual information (MMI), and the minimax MSE, the optimal relay and source matrices have a general beamforming structure. This result includes existing works as special cases. Based on this optimal structure, a new iterative algorithm is developed to jointly optimize the relay and source matrices. We also propose a novel suboptimal relay precoding matrix design which significantly reduces the computational complexity of the optimal design with only a marginal performance degradation. Interestingly, we show that this suboptimal relay matrix is indeed optimal for some special cases. The performance of the proposed algorithms are demonstrated by numerical simulations. It is shown that the novel minimax MSE-based two-way relay system has a better bit-error-rate (BER) performance compared with existing two-way relay systems using the MMSE and the MMI criteria.

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