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Robust decoding strategy of MIMO-STBC using one source Kurtosis based GPSO algorithm

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Abstract

Most research papers have referred that the performance of bit error rate (BER) for a Multiple-Input Multipl-Output Space–Time Block Code (MIMO-STBC) decoder fundamentally relies on the number of pilot symbols. This paper proposes a new strategy for decoding a MIMO-STBC using blind source separation (BSS). First, the STBC decoder is modeled as a noisy linear mixing system, which is decomposed using the technique of real-imaginary (Re-Im). Then Kurtosis based BSS algorithm is applied to the decomposition model. The method of one source extraction is also used to reduce decoding time efficiently. Finally, a global particle swarm optimization method (GPSO) is combined with the one source extraction Kurtosis based BSS to obtain a high speed/low complexity MIMO-STBC decoder. The classical PSO algorithm in this paper is modified by innovating a new updating formula, which is the combination of the swarm behavior and BSS algorithm. Although the new decoder is more complicated as compared with the conventional one, it provides superior BER performance using a fewer number of pilot symbols. Computer simulation for QPSK STBC in a quasi-static flat fading MIMO channel was implemented using MATLAB2018. The new decoder algorithm was tested using only two receivers, worst case. The important point denoted through simulation is the BER performance of the proposed decoder was significantly got better when the length of frames gets longer. The proposed strategy was also used in decoding the \(8\times 8\) MIMO-STBC system in an extreme noise environment. It was found the BER performance improved nine times as compared with the traditional decoder. Finally, the modified GPSO algorithm made the proposed decoder needs a very small number of iterations, even though the search space dimension is very high.

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Authors and Affiliations

  1. Department of Electrical Engineering, College of Engineering, University of Babylon, Babil, Iraq

    Sameer Abdul Kadhim Alrufaiaat & Awwab Qasim Jumaah Althahab

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  1. Sameer Abdul Kadhim Alrufaiaat
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  2. Awwab Qasim Jumaah Althahab
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Correspondence to Awwab Qasim Jumaah Althahab.

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Alrufaiaat, S.A.K., Althahab, A.Q.J. Robust decoding strategy of MIMO-STBC using one source Kurtosis based GPSO algorithm. J Ambient Intell Human Comput 12, 1967–1980 (2021). https://doi.org/10.1007/s12652-020-02288-1

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  • DOI: https://doi.org/10.1007/s12652-020-02288-1

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