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Effective secrecy throughput optimization for GTLS-based UWOC systems with eavesdropper outage constraint.

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    This study optimizes effective secrecy throughput for underwater wireless optical communication using a generalized transmit laser selection scheme. The whale optimization algorithm effectively enhances system security and reliability in oceanic turbulence channels.

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    Area of Science:

    • Underwater wireless optical communication (UWOC)
    • Physical layer security (PLS)

    Background:

    • Practical UWOC systems often lack instantaneous channel state information (CSI) at the transmitter.
    • Oceanic turbulence, induced by salinity, causes fading, modeled using Weibull distribution with angular pointing error.

    Purpose of the Study:

    • To optimize effective secrecy throughput (EST) for UWOC systems under practical constraints.
    • To enhance the physical layer security (PLS) of UWOC by introducing a generalized transmit laser selection (GTLS) scheme.

    Main Methods:

    • Analytical derivation of EST using Meijer's G function and Gauss hypergeometric function, considering a maximum secrecy outage probability (SOP) constraint.
    • Formulation of an optimization problem to maximize constrained EST.
    • Development of a whale optimization algorithm (WOA) for optimizing wiretap code rates, validated by exhaustive search (ES).

    Main Results:

    • The GTLS scheme significantly improves the maximum constrained EST in UWOC systems.
    • The maximum allowed SOP critically influences the achievable maximum constrained EST.
    • The WOA method effectively finds the optimal solution for maximizing constrained EST.

    Conclusions:

    • The proposed GTLS scheme enhances PLS performance in UWOC systems.
    • The developed optimization method provides valuable insights for designing secure and reliable UWOC systems.
    • This research contributes to advancing secure communication technologies in underwater environments.