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Performance analysis of underwater vertical wireless optical communication system in the presence of weak turbulence, pointing errors and attenuation losses

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Abstract

In this paper, we have investigated the performance of underwater vertical wireless optical communication (UVWOC) link employing on–off key modulation in the presence of underwater turbulence, pointing errors and attenuation losses. The turbulence of the medium (assumed to be weak turbulence) has been modeled by employing the hyperbolic tangent log normal (HTLN) distribution. Temperature, pressure and salinity are parameters which can bring about variation of optical transmission characteristics with respect to depth of the ocean/sea. An in-depth study of optical transmission through vertical oceanic links requires the the underwater medium to be modeled as comprising of non-identical turbulent layers. Each of these independent and non-identical turbulence layers are modeled using the HTLN distribution function. The pointing error due to misalignment between source and detector is modeled using Rayleigh displacement pointing error. A novel closed-form expression to quantify the average bit error rate (BER) has been derived for single input single output (SISO) communication link. This expression has then been further generalized to make it applicable to the case of receive diversity schemes such as selection combining, majority logic combining and maximum ratio combining. The expression for the average BER associated with the UVWOC link for different pointing errors, different data rates and different types of ocean water has been determined. Novel closed-form expressions quantifying the outage probability and ergodic channel capacity have been derived for SISO and SC receive diversity schemes. The accuracy of all of the closed-form expressions derived in this paper have been validated using Monte-Carlo simulations.

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Funding

(1) This research work is supported by the Ph.D. fellowship granted by the Ministry of Education, Government of India awarded to the first author. (2) This work is supported by a research grant funded by National Research Foundation (NRF) of Korea Grant (No. 2020R1A4A1019463).

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, National Institute of Technology Karnataka, Surathkal, India

    C. S. Savidhan Shetty & U. Shripathi Acharya

  2. Department of AI and Convergence, Pukyong National University, Busan, South Korea

    Ramavath Prasad Naik

  3. Department of Electronic Engineering, Pukyong National University, Busan, South Korea

    Wan-Young Chung

Authors
  1. C. S. Savidhan Shetty
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  2. Ramavath Prasad Naik
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  3. U. Shripathi Acharya
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  4. Wan-Young Chung
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Contributions

SS evaluated the system’s performance using Monte-Carlo and numerical simulations and wrote the manuscript. PNR validated the results and wrote the manuscript. SA and W-YC reviewed the manuscript.

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Correspondence to C. S. Savidhan Shetty.

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Shetty, C.S.S., Naik, R.P., Acharya, U.S. et al. Performance analysis of underwater vertical wireless optical communication system in the presence of weak turbulence, pointing errors and attenuation losses. Opt Quant Electron 55, 1 (2023). https://doi.org/10.1007/s11082-022-04283-6

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