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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Diversity-reception UWOC system using solar panel array and maximum ratio combining.

Xiao Chen, Weichao Lyu, Chuying Yu

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    |December 28, 2019
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    Summary
    This summary is machine-generated.

    A novel underwater wireless optical communication system using a solar panel array significantly boosts data rates by 40% and expands detection range. This diversity reception technology enhances signal quality and resilience in challenging aquatic environments.

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    Area of Science:

    • Optical Engineering
    • Wireless Communication
    • Photonics

    Background:

    • Underwater wireless optical communication (UWOC) faces challenges in data rate and detection range.
    • Traditional systems often struggle with signal degradation due to water turbidity and movement.

    Purpose of the Study:

    • To develop and evaluate a lens-free UWOC system utilizing a diversity-reception solar panel array.
    • To investigate the performance improvements in data rate, detection range, and signal quality compared to a single detector.
    • To assess the system's robustness against underwater environmental factors like bubbles and particulates.

    Main Methods:

    • Employed a 2x2 solar panel array as a diversity receiver in a lens-free UWOC system.
    • Utilized maximum ratio combining (MRC) to merge signals from the array elements.
    • Conducted theoretical and experimental studies on solar panel size, photocurrent, voltage, and bandwidth relationships.
    • Transmitted a 450-nm blue laser signal over 7 meters in tap water.

    Main Results:

    • Achieved a data rate of 84 Mbps with a bit error rate (BER) of 2.17 × 10-3 using a 16-QAM OFDM signal with the solar panel array.
    • Demonstrated a 40% data rate improvement compared to a single solar panel (60 Mbps).
    • Increased the horizontal detection range from 37 mm (single panel) to 55 mm (array).
    • Showed 5.22 dB higher received power sensitivity for the array compared to a single panel under specific conditions (60 Mbps, BER 10-3).

    Conclusions:

    • The solar panel array with MRC effectively enhances UWOC system performance, improving both data rate and detection range.
    • The diversity reception approach offers superior signal quality and robustness in challenging underwater conditions.
    • The proposed system presents a viable solution for high-performance underwater wireless optical communication.