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Quasi-light Storage for Optical Data Packets
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RSS-based visible light positioning based on channel state information.

Kaiyao Wang, Yongjun Liu, Zhiyong Hong

    Optics Express
    |February 25, 2022
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    Summary
    This summary is machine-generated.

    This study introduces a new visible light positioning method using channel state information (CSI) to overcome indoor multipath interference. The CSI-based approach significantly improves positioning accuracy and reliability compared to traditional methods.

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    Area of Science:

    • Wireless communication
    • Indoor positioning systems
    • Signal processing

    Background:

    • Visible light positioning (VLP) struggles with accuracy due to indoor multipath effects.
    • Received signal strength (RSS) based VLP is susceptible to interference, limiting stability and precision.

    Purpose of the Study:

    • To propose a novel trilateration-based VLP method utilizing channel state information (CSI).
    • To enhance positioning accuracy and reliability in indoor environments by mitigating multipath interference.

    Main Methods:

    • Developed and studied algorithms for estimating channel paths to obtain the line-of-sight (LOS) to total received power ratio.
    • Introduced CSI for estimating LOS path received power, improving ranging accuracy.
    • Reduced interference from reflected paths by focusing on LOS signal components.

    Main Results:

    • Achieved an average positioning accuracy of 6.1 cm and a maximum error of 17.7 cm in a simulated 4m x 4m x 3m space.
    • Demonstrated an 83% improvement in mean positioning error and an 81% improvement in root mean square error (RMSE) compared to the least-squares (LS) method.

    Conclusions:

    • The proposed CSI-based VLP method offers high-precision and high-reliability positioning.
    • This approach effectively overcomes the limitations of RSS-based VLP in indoor multipath environments.