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NLOS visible light positioning and communication based on LoRa modulation.

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    This study introduces a novel non-line-of-sight (NLOS) visible light positioning and communication system using LoRa modulation. It achieves accurate indoor localization even with obstructed paths, overcoming limitations of traditional visible light positioning.

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    Area of Science:

    • Electrical Engineering
    • Computer Science
    • Optical Communications

    Background:

    • Indoor location-based services are crucial with IoT growth.
    • Visible Light Positioning (VLP) offers accuracy and cost-effectiveness but struggles with obstructed paths.
    • Traditional VLP requires line-of-sight, limiting its use in complex indoor settings.

    Purpose of the Study:

    • To develop a non-line-of-sight (NLOS) visible light positioning and communication system.
    • To overcome link obstructions in indoor VLP using LoRa modulation.
    • To enable reliable indoor positioning and communication under challenging lighting conditions.

    Main Methods:

    • Proposed a NLOS VLP system integrating LoRa modulation for signal recovery.
    • Established a geometric relationship between LEDs and a virtual photodetector (PD) image.
    • Derived received signal strength based on NLOS channel models and applied trilateration for positioning.

    Main Results:

    • The system demonstrated reliable communication and positioning over NLOS links.
    • Achieved a 90th percentile localization accuracy below 25 cm at 60 cm PD height.
    • Achieved a 90th percentile localization accuracy below 35 cm at 80 cm PD height.

    Conclusions:

    • The proposed NLOS-VLP system effectively addresses link obstructions using LoRa modulation.
    • This approach enhances the practicality of VLP in complex indoor environments.
    • The system provides a viable solution for accurate indoor positioning and communication.