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Effective interference mitigation scheme for multi-LED-based mobile optical camera communication.

Yiting Yang, Jing He, Biao Zhou

    Applied Optics
    |February 24, 2022
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    Summary
    This summary is machine-generated.

    This study introduces an improved optical camera communication (OCC) system using multiple light-emitting diodes (LEDs) and CMOS sensors. The new method enhances mobile OCC performance by reducing interference and distortion, achieving low bit error rates even at high speeds.

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    Area of Science:

    • Optical Camera Communication (OCC)
    • Wireless Optical Communication
    • Sensing and Imaging Technologies

    Background:

    • Optical Camera Communication (OCC) systems using light-emitting diodes (LEDs) and CMOS image sensors offer low-cost, flexible wireless solutions.
    • Mobile OCC systems face challenges with user mobility, requiring multi-LED setups for seamless communication.
    • Interference and distortion in overlapping LED radiation areas degrade system performance.

    Purpose of the Study:

    • To propose and demonstrate an effective identification, recognition, and sorting-based column selection method to mitigate interchannel interference.
    • To introduce an improved sampling scheme based on length estimation to alleviate distortion from overlapping exposure and user movement.
    • To investigate the performance of a multi-LED mobile OCC system under varying LED overlap rates and user speeds.

    Main Methods:

    • Development of an identification, recognition, and sorting-based column selection algorithm.
    • Implementation of an improved sampling scheme utilizing length estimation.
    • Experimental demonstration and performance analysis of a multi-LED mobile OCC system.
    • Systematic variation of LED radiation area overlap and user moving speed.

    Main Results:

    • The proposed scheme effectively mitigates random interchannel interference in overlapping LED areas.
    • The improved sampling scheme reduces distortion caused by overlapping exposure and user movement.
    • Bit error rate (BER) performance shows slight degradation with increased user speed but remains below the hard-decision forward error code rate limit.
    • A BER close to 10-6 was achieved at a 4.3% LED overlap rate and 80 cm/s user speed.

    Conclusions:

    • The developed identification, recognition, and sorting-based column selection and improved sampling scheme enhance the robustness of multi-LED mobile OCC systems.
    • The system demonstrates reliable performance with low BER, even under dynamic conditions like user movement and overlapping LED coverage.
    • The findings support the feasibility of high-performance mobile OCC for future wireless communication applications.