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    Area of Science:

    • Optical Communications
    • Wireless Networking
    • Signal Processing

    Background:

    • Visible Light Communication (VLC) systems offer high bandwidth potential but face challenges with transmitter nonlinearity and complex analog components.
    • Non-Orthogonal Multiple Access (NOMA) techniques enhance spectral efficiency in communication systems.
    • Integrating NOMA into VLC requires robust and cost-effective transmitter designs.

    Purpose of the Study:

    • To propose and demonstrate a practical Optical-Spatial-Summing-based Non-Orthogonal Multiple Access (OSS-NOMA) technique for VLC systems.
    • To overcome the limitations of conventional NOMA VLC transmitters by avoiding analog components and LED nonlinearity.
    • To enable fine-grained power allocation for multiple users in VLC using commercial off-the-shelf components.

    Main Methods:

    • Developed an OSS-NOMA transmitter utilizing a commercial Light Emitting Diode (LED) array.
    • Employed digital control signals to switch LED chips on/off, creating optical power superposition for NOMA signals.
    • Implemented a prototype VLC system leveraging commercial components for practical demonstration.

    Main Results:

    • Achieved fine-grained power allocation ratios from 0.01 to 1 for two users by controlling LED chip activation.
    • Demonstrated low bit error rates (≤3.1×10-3) for both users.
    • Operated the system at a data rate of 800 kbps, confirming the feasibility of the proposed technique.

    Conclusions:

    • The proposed OSS-NOMA technique offers a practical and efficient solution for VLC systems.
    • This approach effectively mitigates LED nonlinearity and simplifies transmitter design.
    • OSS-NOMA VLC shows significant promise for future Internet of Things (IoT) applications requiring high-capacity wireless communication.