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Toward user mobility for OFDM-based visible light communications.

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    We developed a mobile visible light communication system and used orthogonal circulant matrix transform (OCT) precoding to reduce packet loss caused by user movement. OCT precoding significantly improves performance compared to traditional methods.

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    Area of Science:

    • Optical Communications
    • Wireless Networking
    • Signal Processing

    Background:

    • Mobile visible light communication (mobi-VLC) systems offer high-speed wireless data transmission.
    • User mobility in mobi-VLC systems can lead to significant performance degradation, particularly packet loss.
    • Existing schemes like OFDM and DMT face challenges in maintaining performance under mobile conditions.

    Purpose of the Study:

    • To propose and experimentally demonstrate a mobi-VLC system robust to user mobility.
    • To investigate the impact of user speed and lateral movement on mobi-VLC performance.
    • To evaluate the effectiveness of orthogonal circulant matrix transform (OCT) precoding in mitigating mobility-induced performance issues.

    Main Methods:

    • Experimental setup involving a mobile user terminal detecting a blue laser signal at various speeds (20-80 cm/s) and lateral distances (30-50 cm).
    • Implementation and comparison of channel-independent OCT precoding against conventional orthogonal frequency division multiplexing (OFDM) and adaptive-loaded discrete multi-tone (DMT) schemes.
    • Characterization of system performance based on packet loss rate under different mobility scenarios.

    Main Results:

    • System performance, measured by packet loss, degrades as user mobility speed and lateral distance increase.
    • OCT precoding demonstrates superior performance improvement compared to conventional OFDM.
    • OCT precoding achieves a lower packet loss rate than adaptive-loaded DMT, even at high mobility.
    • No packet loss was observed for a 300 Mb/s transmission with a 30 cm lateral distance at 20 cm/s using OCT precoding.

    Conclusions:

    • User mobility is a critical factor affecting mobi-VLC system performance.
    • OCT precoding is an effective technique for enhancing the reliability of mobi-VLC systems under mobility.
    • The proposed mobi-VLC system with OCT precoding shows promise for high-speed, mobile optical wireless communication.