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Related Experiment Video

Updated: Nov 15, 2025

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Real-time IBFD transmission system based on adaptive optical self-interference cancellation using the hybrid criteria

Zhiyi Zhang, Lizhuo Zheng, Shilin Xiao

    Optics Letters
    |March 2, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel real-time in-band full duplex (IBFD) system using adaptive optical self-interference cancellation (OSIC). It achieves the fastest convergence for IBFD transmission, enabling efficient signal recovery.

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    Area of Science:

    • Optical communications
    • Signal processing

    Background:

    • In-band full duplex (IBFD) systems enable simultaneous data transmission and reception on the same frequency band.
    • Self-interference is a major challenge in IBFD systems, requiring effective cancellation techniques.

    Purpose of the Study:

    • To propose and demonstrate a real-time IBFD transmission system utilizing adaptive optical self-interference cancellation (OSIC).
    • To develop and validate a novel adaptive algorithm for rapid OSIC convergence.

    Main Methods:

    • Implementation of a real-time IBFD system using a field-programmable gate array (FPGA) for orthogonal frequency-division multiplexing (OFDM) transmission.
    • Introduction of the hybrid criteria regular triangle (RT) algorithm to optimize adaptive OSIC control.
    • Real-time adaptive OSIC system capable of converging within 12 sampling times.

    Main Results:

    • Achieved 28 dB cancellation depth across a 0-1.45 GHz wideband.
    • Demonstrated 40 dB cancellation depth at 900 MHz, 2.4 GHz, and 5 GHz.
    • The proposed RT algorithm enabled the fastest convergence in real-time transmission scenarios.

    Conclusions:

    • The developed real-time adaptive OSIC system offers superior cancellation performance compared to existing schemes.
    • The system shows significant potential for various commercial applications requiring efficient IBFD communication.