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Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Orthogonal waveform-based backscattering interference suppression technique for underwater optical wireless

Xinren Zhang, Weijie Liu, Nuo Huang

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |January 31, 2025
    PubMed
    Summary

    This study introduces orthogonal waveforms to improve underwater optical wireless communication (UOWC) performance by reducing backscattering interference. Experiments confirm the effectiveness of this new method in dynamic, bubbly underwater channels.

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    Area of Science:

    • Optical Wireless Communication
    • Signal Processing

    Background:

    • Backscattering interference significantly degrades performance in full-duplex underwater optical wireless communication (UOWC) systems.
    • Detection performance is compromised when backscattering interference power rivals the target signal power.

    Purpose of the Study:

    • To introduce orthogonal waveforms for mitigating backscattering effects in dynamic UOWC systems.
    • To propose a joint maximum likelihood detection scheme tailored for UOWC with orthogonal pulse shaping.

    Main Methods:

    • Utilizing Hermite-Gaussian and prolate spheroidal wave functions for orthogonal waveform generation.
    • Implementing a pulse position modulation (PPM) scheme within the dynamic UOWC system.
    • Developing and applying a joint maximum likelihood detection algorithm.

    Main Results:

    • The proposed method employing orthogonal waveforms significantly alleviates backscattering effects.
    • Experimental results demonstrate superior detection performance compared to systems without orthogonal pulse shaping.
    • The system's effectiveness was validated in a dynamic underwater bubbly channel.

    Conclusions:

    • Orthogonal waveforms are effective in enhancing UOWC system performance by combating backscattering.
    • The joint maximum likelihood detection scheme, coupled with orthogonal waveforms, offers a robust solution for UOWC.
    • The findings are particularly relevant for UOWC systems operating in challenging, dynamic underwater environments.