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Single LED visible light positioning scheme based on intelligent reflecting surfaces.

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    |August 12, 2025
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    Summary

    This study introduces intelligent reflective surfaces (IRS) as virtual light sources for visible light positioning (VLP). A novel signal strength difference scheme enables accurate positioning, even with blocked links, outperforming traditional methods.

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    Area of Science:

    • Wireless communication
    • Indoor positioning systems
    • Optical networking

    Background:

    • Visible light positioning (VLP) offers infrastructure-free operation.
    • Existing VLP schemes struggle with single-light-source scenarios.
    • Intelligent Reflective Surfaces (IRS) are proposed as a novel solution.

    Purpose of the Study:

    • To develop a VLP scheme using IRS as virtual light sources.
    • To enable positioning in single-light-source environments.
    • To mitigate spatial interference and estimate IRS power accurately.

    Main Methods:

    • A novel 'difference of received signal strength' positioning scheme is proposed.
    • Cramér-Rao lower bound is derived to analyze positioning accuracy.
    • The impact of IRS parameters (rotation, layout, quantity) is investigated.

    Main Results:

    • The proposed scheme achieves 0.056 m accuracy with 16 IRS units.
    • IRS layout significantly impacts positioning accuracy, more than quantity.
    • Optimized IRS layout reduces positioning error to 0.028 m.

    Conclusions:

    • IRS can effectively serve as virtual light sources for VLP.
    • The proposed scheme offers robust positioning without precise noise modeling.
    • IRS layout optimization is crucial for enhancing VLP performance.