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Experimental investigation on backscattering interference cancellation for full-duplex UOWC based on time-reversal

Weijie Liu, Shuzhe Zhang, Nuo Huang

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |June 10, 2024
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    Summary

    This study tackles self-interference in full-duplex underwater optical wireless communication (UOWC) systems. A novel digital-domain backscattering interference cancellation (BIC) algorithm significantly improves bit error rate performance in diverse underwater conditions.

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    Area of Science:

    • Optical Wireless Communications
    • Underwater Acoustics and Optics
    • Signal Processing

    Background:

    • Full-duplex (FD) underwater optical wireless communication (UOWC) offers enhanced spectral efficiency and networking capabilities.
    • Self-interference from underwater backscattering degrades FD-UOWC system performance, posing a significant challenge.

    Purpose of the Study:

    • To experimentally investigate the characteristics of the underwater backscattering channel.
    • To propose and validate a digital-domain backscattering interference cancellation (BIC) algorithm for FD-UOWC systems.

    Main Methods:

    • Experimental exploration of underwater backscattering channel properties.
    • Development of a digital-domain BIC algorithm incorporating time-reversal preprocessing.
    • Experimental verification of the BIC algorithm's performance under various channel conditions.

    Main Results:

    • The proposed BIC algorithm effectively mitigates self-interference in FD-UOWC systems.
    • Substantial improvements in bit error rate (BER) performance were observed across diverse underwater channel scenarios.
    • The feasibility of the BIC algorithm was validated through experimental investigation.

    Conclusions:

    • The developed digital-domain BIC algorithm is effective for enhancing FD-UOWC system performance.
    • This work provides a viable solution for overcoming backscattering challenges in UOWC networking.
    • The proposed method offers significant potential for robust underwater optical communication systems.