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Toward 6 Gbps real-time laser-based white visible light communication enabled by pilot-aided clock synchronization.

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    This study demonstrates a high-speed white Visible Light Communication (VLC) system using Quadrature Amplitude Modulation-Orthogonal Frequency Division Multiplexing (QAM-OFDM) and a novel clock synchronization scheme. The system achieved a record 6 Gbps data rate at 10 meters, advancing 6G wireless networks.

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    Area of Science:

    • Optoelectronics
    • Wireless Communication
    • Signal Processing

    Background:

    • Visible Light Communication (VLC) integrates illumination and data transmission, positioning it as a key technology for future Beyond 5G/6G wireless networks.
    • Existing VLC systems face challenges with transmission errors due to frequency offsets between transceivers.

    Purpose of the Study:

    • To demonstrate a high-speed, real-time phosphorescent laser-based white VLC system.
    • To propose and validate a novel Pilot-Aided Clock Synchronization (PCSN) scheme to mitigate transmission errors.
    • To achieve record-breaking data rates for real-time white VLC systems.

    Main Methods:

    • Development of a miniaturized demo board (10x10 cm) integrating a phosphorescent laser-based white VLC system.
    • Implementation of Quadrature Amplitude Modulation-Orthogonal Frequency Division Multiplexing (QAM-OFDM) on a Field-Programmable Gate Array (FPGA).
    • Proposal and application of a Pilot-Aided Clock Synchronization (PCSN) scheme utilizing an approximate harmonic mean for frequency offset compensation.

    Main Results:

    • Real-time VLC links achieved 4.69 Gbps at 1.5m, 4.55 Gbps at 10m, and 4 Gbps at 19.6m with a 16QAM-OFDM and PCSN scheme, all below the Forward Error Correction (FEC) limit.
    • A bit-loading scheme enhanced the data rate to 6 Gbps at 10m, a ~31.87% improvement over fixed 16QAM.
    • The demonstrated system achieved the highest reported data rate for real-time white VLC systems.

    Conclusions:

    • The proposed phosphorescent laser-based white VLC system with PCSN offers a viable solution for high-speed wireless communication.
    • The system's ability to achieve high data rates over significant distances makes it a strong candidate for next-generation wireless networks.
    • The integration of advanced modulation and synchronization techniques pushes the boundaries of VLC performance.