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Spatial dimming scheme for optical OFDM based visible light communication.

Yang Yang, Zhimin Zeng, Julian Cheng

    Optics Express
    |January 7, 2017
    PubMed
    Summary
    This summary is machine-generated.

    A novel spatial dimming orthogonal frequency division multiplexing (SD-OFDM) scheme enhances visible light communication. This method efficiently controls illumination by adjusting light-emitting diodes (LEDs), mitigating noise and improving performance.

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    Area of Science:

    • Visible Light Communication (VLC)
    • Optical Wireless Communication
    • Signal Processing

    Background:

    • Orthogonal frequency division multiplexing (OFDM) is widely used in visible light communication (VLC).
    • Existing dimming schemes in VLC, such as analog and digital dimming, face challenges with clipping noise and operational limitations.
    • There is a need for efficient and robust dimming control schemes in multi-input multi-output (MIMO) OFDM-based VLC systems.

    Purpose of the Study:

    • To propose a new dimming control scheme, spatial dimming orthogonal frequency division multiplexing (SD-OFDM), for MIMO-OFDM based VLC systems.
    • To demonstrate the effectiveness of SD-OFDM in mitigating clipping noise compared to traditional dimming methods.
    • To present a feasible and efficient dimming solution for VLC applications.

    Main Methods:

    • The proposed SD-OFDM scheme represents illumination levels by controlling the number of active light-emitting diodes (LEDs).
    • This approach avoids adjusting the biasing level of individual LEDs, thereby reducing clipping noise.
    • The scheme operates with LEDs in an 'on-state' for varied illumination levels, unlike pulse width modulation (PWM) based digital dimming.

    Main Results:

    • SD-OFDM significantly mitigates clipping noise compared to analog dimming schemes.
    • The proposed scheme offers a continuous 'on-state' operation across different illumination levels, unlike digital dimming.
    • Analytical and simulation results confirm the efficiency and feasibility of the SD-OFDM scheme.

    Conclusions:

    • SD-OFDM is an efficient and feasible dimming control scheme for MIMO-OFDM based VLC.
    • The scheme effectively reduces clipping noise and offers operational advantages over existing analog and digital dimming techniques.
    • SD-OFDM presents a promising advancement for controllable and high-performance visible light communication systems.