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Integrated physical-layer secure visible light communication and positioning system based on polar codes.

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    This study introduces an integrated visible light communication (VLC) and positioning system offering secure data transmission, accurate indoor positioning, and flicker-free illumination. The system achieves high physical-layer security and reliable communication without compromising user experience.

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    Area of Science:

    • Optical Wireless Communication
    • Information Security
    • Indoor Positioning Systems

    Background:

    • Visible Light Communication (VLC) offers potential for information-theoretic security at the physical layer.
    • Accurate location information is vital for secure VLC channel estimation and scheme design.
    • Existing systems often lack integrated functionalities for communication, positioning, and illumination quality.

    Purpose of the Study:

    • To propose an integrated VLC and positioning system with triple functionalities: high-accuracy indoor positioning, physical-layer secure VLC, and flicker mitigation illumination.
    • To develop novel signal processing techniques for efficient data and positioning signal convergence and separation.
    • To design a robust error correction scheme for simultaneous security and reliability.

    Main Methods:

    • A heterogeneous signal hybrid line coding scheme for signal convergence at the transmitter.
    • A hybrid heterogeneous signal extraction scheme using a photodetector and CMOS image sensor at the receiver.
    • A polar codes-based forward error correction scheme leveraging positioning information for physical-layer security.

    Main Results:

    • Achieved a secrecy code rate of 0.76 and transmission efficiency of 0.38 without perceivable flicker in simulations.
    • Demonstrated an average positioning accuracy of 3.35 cm in experiments.
    • Reduced legitimate receiver bit error rate to <10-7 while maintaining eavesdropper bit error rate at ~0.5, yielding a high secrecy capacity of 0.9994 at 1 Mbps.

    Conclusions:

    • The proposed integrated system effectively combines high-accuracy indoor positioning, physical-layer secure VLC, and flicker-free illumination.
    • The novel coding and signal extraction schemes enable simultaneous high-speed communication, reliable positioning, and robust security.
    • This approach significantly enhances the security and utility of optical wireless communication systems.