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    FFT-Accelerated Iterative MIMO Chip Equalizer Architecture For CDMA Downlink

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    Author
    Guo, Yuanbin; McCain, Dennis; Cavallaro, Joseph R.
    Date
    2005-02-01
    Abstract
    In this paper, we present a novel FFT-accelerated iterative Linear MMSE chip equalizer in the MIMO CDMA downlink receiver. The reversed form time-domain matrix multiplication in the Conjugate Gradient iteration is accelerated by an equivalent frequency-domain circular convolution with FFT-based "overlap-save" architecture. The iteration rapidly refines a crude initial approximation to the actual final equalizer taps. This avoids the Direct-Matrix-Inverse with O((<i>NL</i>)&sup3;) complexity, and reduces the standard CG complexity from O((<i>NL</i>)&sup2;) to O(<i>NL</i>log<sub>2</sub>(<i>NL</i>)). Simulation demonstrates strong numerical stability and promising performance/complexity tradeoff, especially for very long channels.
    Description
    Conference Paper
    Citation
    Y. Guo, D. McCain and J. R. Cavallaro, "FFT-Accelerated Iterative MIMO Chip Equalizer Architecture For CDMA Downlink," 2005.
    Published Version
    http://dx.doi.org/10.1109/ICASSP.2005.1415882
    Keyword
    MIMO; chip equalizer; CDMA; iterative; MIMO; More... chip equalizer; CDMA; iterative Less...
    Type
    Conference paper
    Citable link to this page
    https://hdl.handle.net/1911/19935
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    • DSP Publications [508]
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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
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    Site Map