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An adaptive scaling and biasing scheme for OFDM-based visible light communication systems.

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    This study introduces an adaptive scheme for Orthogonal Frequency-Division Multiping (OFDM) in visible light communication. It optimizes signal scaling and biasing to enhance data transmission performance without altering LED power.

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    Area of Science:

    • Optical Communications
    • Signal Processing

    Background:

    • Orthogonal frequency-division multiplexing (OFDM) is crucial for high-rate data transmission in visible light communication (VLC).
    • Nonlinear characteristics of light emitting diodes (LEDs) and high peak-to-average-power ratio (PAPR) of OFDM signals necessitate signal scaling and biasing.
    • Existing methods may not fully utilize the dynamic range of LEDs, limiting system performance.

    Purpose of the Study:

    • To propose an adaptive scaling and biasing scheme for OFDM-based VLC systems.
    • To enhance system performance by optimizing the utilization of LED dynamic range.
    • To improve the trade-off between signal power and clipping distortion.

    Main Methods:

    • An adaptive scheme is developed to calculate near-optimal scaling and biasing factors for each OFDM symbol.
    • The scheme dynamically adjusts parameters based on the distribution of the OFDM signals.
    • The method aims to maximize effective signal power while minimizing clipping distortion.

    Main Results:

    • The proposed adaptive scheme significantly improves system performance in OFDM-based VLC.
    • The scheme effectively exploits the dynamic range of LEDs.
    • Performance gains are achieved without increasing the LED's emitted power.

    Conclusions:

    • The adaptive scaling and biasing scheme offers a significant performance improvement for OFDM-based VLC systems.
    • This approach enhances data transmission efficiency by optimizing signal modulation for LEDs.
    • The method provides a practical solution for improving VLC performance with existing hardware.