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Real-time underwater visible light mobile communication with conditional feedback threshold under random receiver

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    This study introduces a real-time underwater visible light mobile communication (UVLMC) system using conditional feedback threshold (CFT) to improve performance with random receiver orientations. The new system enhances dynamic range by 4.8 times.

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    Area of Science:

    • Underwater visible light communication
    • Mobile communication systems
    • Optical wireless communication

    Background:

    • Real-time mobile communication is vital for underwater visible light communication (UVLMC) applications.
    • Receiver orientation significantly affects UVLMC performance in practical systems.
    • Limited research exists on mitigating orientation challenges in UVLMC.

    Purpose of the Study:

    • To propose and evaluate a real-time UVLMC system enhanced by a conditional feedback threshold (CFT) mechanism.
    • To improve communication performance under random receiver orientations.
    • To expand the operational dynamic range of underwater mobile communication.

    Main Methods:

    • Development of a real-time UVLMC system incorporating a CFT algorithm.
    • Experimental validation in a tap water channel simulating underwater conditions.
    • Testing under various random receiver orientations and movement speeds.

    Main Results:

    • Achieved real-time UVLMC over 60 meters at 2 Mb/s with random orientations.
    • System operated effectively with mean polar angles up to 40° and azimuth angles up to 120°.
    • Demonstrated a 7-meter dynamic range, a 4.8-fold improvement over systems without CFT.

    Conclusions:

    • The proposed CFT mechanism significantly enhances the dynamic range and robustness of real-time UVLMC systems.
    • The system effectively addresses challenges posed by random receiver orientations in mobile underwater environments.
    • This advancement is crucial for reliable underwater mobile communication applications.