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Adaptive over-the-air RF self-interference cancellation using a signal-of-interest driven regular triangle algorithm.

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    This study demonstrates an optical radio frequency self-interference cancellation system for full duplex transmission. The system effectively cancels interference to retrieve the signal of interest, achieving significant cancellation depth.

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    Area of Science:

    • Electrical Engineering
    • Optical Communications
    • Signal Processing

    Background:

    • Full duplex communication enables simultaneous data transmission and reception.
    • Radio frequency (RF) self-interference is a major challenge in full duplex systems.
    • Effective self-interference cancellation is crucial for retrieving the desired signal.

    Purpose of the Study:

    • To demonstrate an optically-enabled RF self-interference cancellation system.
    • To achieve high-performance in-band full duplex transmission.
    • To adaptively optimize cancellation using the signal of interest (SOI).

    Main Methods:

    • Utilized a signal-of-interest (SOI) driven regular triangle algorithm for adaptive cancellation.
    • Employed bursts of pseudo-random binary sequences for rapid optimization.
    • Implemented an over-the-air experiment at 18.35 GHz with a 300 MHz bandwidth.

    Main Results:

    • Achieved 22 dB of self-interference cancellation depth.
    • Demonstrated effective cancellation down to the noise floor.
    • Showcased the system's ability to adapt to changing conditions.

    Conclusions:

    • The optically-enabled RF self-interference cancellation system is effective for in-band full duplex transmission.
    • SOI-driven adaptive algorithms provide robust and efficient interference management.
    • The system eliminates the need for digital self-interference cancellation.