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Low complexity OFDM VLC system enabled by spatial summing modulation.

Yanbing Yang, Chen Chen, Pengfei Du

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    Summary
    This summary is machine-generated.

    This study introduces a novel spatial summing modulation scheme for visible light communication (VLC) using commercial LED lights, achieving high data rates for Internet of Things (IoT) applications.

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    Area of Science:

    • Optoelectronics and Communications
    • Wireless Networking

    Background:

    • Commercial-off-the-shelf (COTS) visible light communication (VLC) systems face limitations in data rate due to LED non-linearity and frequency response.
    • Existing VLC systems often require specialized devices, hindering widespread adoption in Internet of Things (IoT) applications.

    Purpose of the Study:

    • To propose and demonstrate a novel spatial summing modulation scheme for VLC systems utilizing COTS LED lighting.
    • To overcome the data rate limitations imposed by conventional VLC systems and enable higher throughput for IoT.

    Main Methods:

    • A power-of-2 arrangement of LED chips was employed to create spatial summing modulation.
    • A novel digital-to-light converter (DLC) was designed to output 256 linear light intensities directly from digital signals.
    • The proposed system was integrated into an orthogonal frequency division multiplexing (OFDM) VLC framework using Quadrature Amplitude Modulation (QAM-OFDM).

    Main Results:

    • The experimental demonstration achieved low Bit Error Rates (BERs) below the forward error correction (FEC) threshold of 3.8×10-3 for QAM8 and QAM16.
    • A transmission frequency of 300 kHz was sustained over a communication distance of 0.8 meters.
    • The system demonstrated the potential for data rates at the hundred kbps level, suitable for many IoT applications.

    Conclusions:

    • The proposed spatial summing VLC system effectively enhances data rates using COTS devices.
    • The novel DLC and modulation scheme offer a practical solution for high-performance VLC in IoT.
    • This approach presents a promising pathway for leveraging existing LED infrastructure for high-speed wireless communication.