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Underwater optical wireless communication performance enhancement using 4D 8PAM trellis-coded modulation OFDM with

Lin Xu, Jing He, Zhihua Zhou

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    PubMed
    Summary
    This summary is machine-generated.

    A new 4D 8-pulse amplitude modulation trellis-coded modulation-orthogonal frequency division multiplexing (4D 8PAM TCM-OFDM) scheme improves underwater optical wireless communication receiver sensitivity by resisting power fading. This advanced scheme offers significant performance gains over conventional methods.

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    Area of Science:

    • Optical Wireless Communications
    • Digital Signal Processing
    • Modulation Schemes

    Background:

    • Underwater optical wireless communication (UOWC) systems face challenges from signal attenuation, scattering, and reflection, leading to power fading.
    • Conventional modulation schemes like 64-quadrature amplitude modulation orthogonal frequency division multiplexing (64QAM-OFDM) are susceptible to these channel impairments.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel 4D 8-pulse amplitude modulation trellis-coded modulation-orthogonal frequency division multiplexing (4D 8PAM TCM-OFDM) scheme for UOWC.
    • To evaluate the performance improvement offered by the proposed scheme in mitigating power fading and compensating for unbalanced impairments.

    Main Methods:

    • Implementation of a 4D 8PAM TCM-OFDM scheme integrated with discrete Fourier transform (DFT) precoding.
    • Experimental demonstration within an underwater optical wireless communication channel.
    • Comparison of receiver sensitivity against a conventional 64QAM-OFDM scheme.

    Main Results:

    • The 4D 8PAM TCM-OFDM scheme achieved a receiver sensitivity improvement of 0.88 dB compared to 64QAM-OFDM at a bit error rate of 3.8×10-3.
    • The proposed scheme combined with DFT precoding demonstrated a further 1.28 dB receiver sensitivity improvement, effectively compensating for unbalanced impairments.

    Conclusions:

    • The 4D 8PAM TCM-OFDM scheme offers a robust solution for enhancing UOWC system performance by effectively combating power fading.
    • The integration of DFT precoding further boosts receiver sensitivity, highlighting the scheme's potential for reliable underwater communication.