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    This study enhances underwater wireless optical communication (UWOC) using optical space shift keying (OSSK) by optimizing laser/detector allocation and beam waist. Channel estimation errors surprisingly improve bit error rate (BER) performance.

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    Area of Science:

    • Underwater Wireless Optical Communication (UWOC)
    • Optical Communication Systems
    • Wireless Communication

    Background:

    • Underwater wireless optical communication (UWOC) systems face challenges from turbulent fading channels, pointing errors, and channel estimation errors.
    • Optical Space Shift Keying (OSSK) is a modulation technique used in UWOC systems.
    • Gamma-Gamma distribution is a model for turbulent fading channels.

    Purpose of the Study:

    • To analyze the bit error rate (BER) performance of UWOC systems using OSSK under gamma-gamma turbulent fading channels.
    • To investigate the impact of pointing errors and channel estimation errors on OSSK-UWOC system performance.
    • To derive new expressions for probability density function (PDF) considering error factors.

    Main Methods:

    • Development of new PDF expressions for the Gamma-Gamma distribution with error factors.
    • Analysis of the statistical characteristics of attenuation coefficients in OSSK systems.
    • Analytical evaluation of average BER performance.

    Main Results:

    • Optimal allocation of lasers and detectors improves spectral efficiency (SE) and BER performance.
    • Narrow beam waist enhances OSSK-UWOC system performance.
    • Higher channel estimation error (e.g., ρ=0.7) provides a significant signal-to-noise ratio (SNR) gain (45 dB) compared to lower error (ρ=0.95).

    Conclusions:

    • The findings provide valuable insights for designing robust and efficient OSSK-UWOC systems.
    • Strategic system parameter allocation and understanding the role of channel estimation errors are crucial for performance optimization.
    • The study highlights the potential of OSSK in UWOC for improved underwater data transmission.