Article Dans Une Revue Optics and Laser Technology Année : 2025

Robust FD-DFE equalization for optical OTFS-based NOMA multi-user MIMO in visible light communication systems

Résumé

Visible Light Communication (VLC) has emerged as a promising indoor optical wireless communication (IOWC) solution, complementing traditional RF systems by offering high-speed and cost-effective data transmission. However, challenges such as limited modulation bandwidth in multi-user (MU) VLC systems hinder high data rates. This study introduces a framework based on optical orthogonal time frequency space (OTFS) and non-orthogonal multiple access (NOMA) for MU multiple-input multiple-output (MIMO) systems. The proposed system leverages decision feedback equalization (DFE) with maximum likelihood (ML) estimation to address inter-symbol and inter-user interference in the 2D delay-Doppler domain. Optimization of waveform parameters under peak power constraints ensures balanced communication performance. Extensive evaluations confirm that DFE-ML outperforms benchmarks like minimum mean square error (MMSE) with the successive interference cancellation (SIC) and FD-ZFE, achieving better bit error ratio (BER) performance at a high signal-to-noise ratio (SNR). A provided numerical comparison of power spectrum density (PSD) for optical OTFS modulation derivatives and mitigating interference, spectral efficiency (SE), and sum rates under imperfect channel state information (CSI). Developed optical OTFS framework for next-generation VLC systems, integrating precise sensing with high-performance communication to enable intelligent wireless sensing and efficient connectivity.

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Dates et versions

hal-05217378 , version 1 (21-08-2025)

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Mohamed El Jbari, Mohamed Moussaoui, Atika Rivenq, Houda Bel Mokadem. Robust FD-DFE equalization for optical OTFS-based NOMA multi-user MIMO in visible light communication systems. Optics and Laser Technology, 2025, 190, pp.113214. ⟨10.1016/j.optlastec.2025.113214⟩. ⟨hal-05217378⟩
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