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Logistic-function-based nonlinear companding transform for asymmetrical hybrid optical orthogonal frequency division

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    This study introduces a logistic-function-based nonlinear companding transform (LNCT) to improve asymmetrical hybrid optical orthogonal frequency division multiplexing (AHO-OFDM) signals in visible light communications (VLC). The new method effectively reduces signal peak-to-average power ratio, enhancing VLC system performance.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Visible Light Communications

    Background:

    • Asymmetrical hybrid optical orthogonal frequency division multiplexing (AHO-OFDM) signals face challenges with high peak-to-average power ratio (PAPR).
    • Reducing PAPR is crucial for enhancing the efficiency and performance of visible light communication (VLC) systems.

    Purpose of the Study:

    • To propose and evaluate a novel logistic-function-based nonlinear companding transform (LNCT) for AHO-OFDM signals.
    • To reduce the PAPR of AHO-OFDM signals in VLC systems.

    Main Methods:

    • A piecewise companding transform is developed using a nonlinear logistic function and a linear function.
    • Signal amplitudes are divided into positive and nonnegative groups.
    • Frame-by-frame peak detection identifies the group with the maximum peak for targeted transformation.

    Main Results:

    • The proposed LNCT scheme demonstrates superior performance compared to the classical linear nonsymmetrical transform.
    • Significant reduction in PAPR was achieved while maintaining competitive bit error rate (BER) performance.
    • The complementary cumulative distribution function (CCDF) shows marked improvement.

    Conclusions:

    • The LNCT is a promising technique for mitigating PAPR issues in AHO-OFDM signals.
    • The proposed method shows significant application potential for advanced VLC systems.
    • LNCT offers an effective solution for improving the efficiency of optical wireless communication.