Research on Real-time Simulated Self-interference Cancellation Technology of Full Duplex Underwater Acoustic Communication

In-band full-duplex Underwater acoustic communication (IBFD-UWAC) can significantly improve the utilization of the communication frequency band. Because the local high power interference signal will affect the reception of the expected signal, the self-interference cancellation (SIC) becomes the core of IBFD-UWAC. This paper proposes a real-time SIC testing method based on Simulink Desktop Real-Time®. This paper uses least mean squares and recursive least squares adaptive algorithms to achieve self-interference cancellation. Hardware-in-loop simulation results show that both algorithms can achieve 55dB real-time SIC under time-varying UWA channels. Compared with the traditional method, the algorithm proposed in this paper is performed in real-time, which dramatically increases the efficiency of communication between the two sides. This method is suitable for IBFD-UWAC.