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A Chip-Level BSOR-Based Linear GSIC Multiuser Detector for Long-Code CDMA Systems

EURASIP Journal on Wireless Communications and Networking volume 2007, Article number: 025945 (2008) Cite this article

Abstract

We introduce a chip-level linear group-wise successive interference cancellation (GSIC) multiuser structure that is asymptotically equivalent to block successive over-relaxation (BSOR) iteration, which is known to outperform the conventional block Gauss-Seidel iteration by an order of magnitude in terms of convergence speed. The main advantage of the proposed scheme is that it uses directly the spreading codes instead of the cross-correlation matrix and thus does not require the calculation of the cross-correlation matrix (requires floating point operations (flops), where is the processing gain and is the number of users) which reduces significantly the overall computational complexity. Thus it is suitable for long-code CDMA systems such as IS-95 and UMTS where the cross-correlation matrix is changing every symbol. We study the convergence behavior of the proposed scheme using two approaches and prove that it converges to the decorrelator detector if the over-relaxation factor is in the interval ]0, 2[. Simulation results are in excellent agreement with theory.

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Authors and Affiliations

  1. Electrical Engineering Department, King Fahd University of Petroleum and Minerals, P.O.Box 1387, Dhahran, 31261, Saudi Arabia

    A. Bentrcia & A. Zerguine

  2. Department of Electronics, Faculty of Engineering, University of Batna, Batna, 05000, Algeria

    M. Benyoucef

Authors
  1. A. Bentrcia
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  2. A. Zerguine
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  3. M. Benyoucef
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Correspondence to A. Bentrcia.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Bentrcia, A., Zerguine, A. & Benyoucef, M. A Chip-Level BSOR-Based Linear GSIC Multiuser Detector for Long-Code CDMA Systems. J Wireless Com Network 2007, 025945 (2008). https://doi.org/10.1155/2007/25945

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