Evaluation of underwater optical wireless channels over F turbulence for different detection types

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Zedini, Emna and Ata, Yalçın and Al-Sallami, Farah Mahdi and Rajbhandari, Sujan (2024) Evaluation of underwater optical wireless channels over F turbulence for different detection types. IEEE Transactions on Communications. ISSN 0090-6778 (https://doi.org/10.1109/tcomm.2024.3454696)

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Abstract

This paper presents a comprehensive performance study for the underwater optical wireless communication (UOWCs) channel, accounting for the effects of attenuation, turbulence, pointing errors, and fluctuations in the angle-of-arrival (AOA), modeled by the Beer-Lambert model, the Fisher-Snedecor F turbulence, Hoyt, and Rayleigh distributions, respectively. Considering the stochastic nature of UOWC, closed-form expressions for outage probability, average bit-error-rate (BER), and ergodic capacity are derived. The results revealed that increasing the field-of-view (FoV) reduces the impact of aoa fluctuations. Asymmetric two-dimensional beam misalignment exhibits better outage probability performance compared to symmetric misalignment. Furthermore, heterodyne detection consistently outperforms direct detection. When employing heterodyne detection, M-quadrature amplitude modulation (M-QAM) achieves superior BER performance. Additionally, as absorption increases with longer wavelengths, BER performance deteriorates. Narrower beamwidths improve ergodic capacity by enhancing received signal power.

ORCID iDs

Zedini, Emna, Ata, Yalçın, Al-Sallami, Farah Mahdi and Rajbhandari, Sujan ORCID logoORCID: https://orcid.org/0000-0001-8742-118X;
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