Self-interference Characterization for In-Band Full Duplex Underwater Acoustic Communications

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Here we analyze the characteristics of the self-interference based on the fieldwork, where self-interference measurements have been collected for multiple acoustic frequencies ranging from 20 to 180 kHz. The interference cancellation (IC) gain, as the performance metric of the digital self-interference suppression, is found to decrease when the acoustic carrier frequency increases. We propose to use the channel variation ratio (CVR) to characterize channel variability. Experimental results show that the CVR is larger at higher acoustic frequencies and high CVRs lead to performance degradation in self-interference suppression. Computer simulations have also been conducted to explain the experimental observations.

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