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Efficient MIMO equalization for downlink multi-code CDMA: complexity optimization and comparative study

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Title: Efficient MIMO equalization for downlink multi-code CDMA: complexity optimization and comparative study
Author: Guo, Yuanbin; Zhang, Jianzhong (Charlie); McCain, Dennis; Cavallaro, Joseph R.
Type: Conference paper
Keywords: MIMO equalizer; Multi-code CDMA; complexity
Citation: Y. Guo, J. (. Zhang, D. McCain and J. R. Cavallaro, "Efficient MIMO equalization for downlink multi-code CDMA: complexity optimization and comparative study," vol. 4, no. 7, pp. 2513 - 2519, 2004.
Abstract: In this paper, we present an efficient LMMSE chip equalizer to suppress the interference caused by the multipath fading channel in the MIMO multi-code CDMA downlink. The block-Toeplitz structure in the correlation matrix is approximated with a block circulant matrix. An FFT-based algorithm is applied to avoid the Direct-Matrix-Inverse (DMI) in the system equation. Hermitian optimization is proposed to further reduce the complexity. A comparative study in both performance and complexity with the Conjugate-Gradient (CG) algorithm is then presented. The simulation shows very promising results for the FFT-based equalizer compared with both the DMI and CG algorithms.
Date Published: 2004-11-01

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  • ECE Publications [1048 items]
    Publications by Rice University Electrical and Computer Engineering faculty and graduate students
  • CMC Publications [275 items]
    Publications by Rice Faculty and graduate students in multimedia communications