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Increasing the power and spectral efficiencies of an OFDM-based VLC system through multi-objective optimization.

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    This study optimizes visible light communication (VLC) systems using constant envelope orthogonal frequency division multiplexing (CE-OFDM). CE-OFDM enhances spectral efficiency and reduces signal-to-noise ratio requirements, improving data transmission reliability.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Wireless Networks

    Background:

    • Visible light communication (VLC) systems face challenges due to light-emitting diode (LED) nonlinearity.
    • Orthogonal frequency division multiplexing (OFDM) parameterization is complex in VLC due to these nonlinearities.

    Purpose of the Study:

    • To optimize transmitted power and spectral efficiency for both conventional and constant envelope (CE) OFDM in VLC systems.
    • To evaluate the bit error rate (BER) performance under varying conditions.

    Main Methods:

    • A multi-objective optimization problem was formulated to maximize transmitted power and spectral efficiency.
    • The non-dominated sorting genetic algorithm II (NSGA-II) was employed for optimization.
    • Bit error rate (BER) was used as the primary performance metric.

    Main Results:

    • Signal-to-noise ratio (SNR) requirements decrease with increasing guard band due to intermodulation distortion mitigation.
    • Constant envelope OFDM (CE-OFDM) in VLC systems requires lower SNR compared to traditional OFDM.
    • For a BER of 1x10-3, CE-OFDM achieved approximately 10.8 dB for 4-QAM and 24 dB for 16-QAM with a 6% guard band.

    Conclusions:

    • CE-OFDM offers a significant improvement in SNR and spectral efficiency for VLC systems.
    • The proposed optimization strategy effectively addresses LED nonlinearity challenges in OFDM-based VLC.
    • CE-OFDM is a promising technique for enhancing the performance of future VLC systems.