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A novel bandwidth efficient SOC-based turbo coding scheme mid reduced complexity MUD for SA-based MC-CDMA systems

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Abstract

Multiuser-detection (MUD), turbo coding and smart-antennas (SA) are powerful techniques for enhancing the performance and capacity of MC-CDMA systems. Among the MUD algorithms, the maximum-likelihood (ML) method has the best performance but its complexity increases exponentially with the number of users and constellation size. In this paper, we first propose a novel bandwidth-efficient-channel-coding-scheme (BECCS) for a super-orthogonal-code (SOC)-based serially concatenated turbo code (SCSOC) so that by using it, the coded system without extra bandwidth significantly improves the performance of an uncoded system over a fading channel. Second, in order to reduce the complexity of the ML-based turbo MUD technique, an ML algorithm based on the sensitive-bits-algorithm (SBA) and a less-complex-norm-approximation (LCNA) based Euclidean distance is proposed for a SCSOC-based BECCS assisted coded MC-CDMA system accompanied by SA techniques at the receiver. Our analytical and simulation results show that from a performance perspective, at BER=10−2, the proposed SCSOC-based BECCS assisted MC-CDMA system performs 4 dB better than SOC-based coded systems. The latter system has 5 dB gain in comparison with an uncoded one, all in the same bandwidth and over fading channels.

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Authors and Affiliations

  1. Iran Telecommunication Research Center, P.O. Box 14155-3961, Tehran, Iran

    Ali Reza Enayati & Ahmad Salahi

  2. Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran

    Paeiz Azmi

  3. Electrical and Computer Engineering Department, Shahed University of Tehran, Tehran, Iran

    Yaghoob Taghinia

Authors
  1. Ali Reza Enayati
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  2. Paeiz Azmi
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  3. Yaghoob Taghinia
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  4. Ahmad Salahi
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Correspondence to Ali Reza Enayati.

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Enayati, A.R., Azmi, P., Taghinia, Y. et al. A novel bandwidth efficient SOC-based turbo coding scheme mid reduced complexity MUD for SA-based MC-CDMA systems. Telecommun Syst 50, 71–88 (2012). https://doi.org/10.1007/s11235-010-9389-9

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  • DOI: https://doi.org/10.1007/s11235-010-9389-9

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