Digital Self-interference Cancellation Method for Asynchronous Simultaneous Co-frequency Full-duplex Underwater Acoustic Communication System

Abstract

The invention discloses a digital self-interference cancellation method of an asynchronous simultaneous same-frequency full-duplex underwater acoustic communication system. The asynchronous full-duplex underwater acoustic communication has the characteristics that there is a delay difference between a self-interference signal and a desired signal to arrive at a receiving end. According to the method provided by the invention, a self-interference channel is estimated by using a non-overlapping area of the self-interference signal and the desired signal, thus avoiding the influence of the desired signal on the estimation accuracy of the self-interference channel and further improving the self-interference cancellation performance. To counteract a nonlinear component in the self-interferencesignal, the invention proposes a parameterized recursive least squares algorithm to estimate a nonlinear channel to counteract the nonlinear component in the self-interference signal. By adoption of the method disclosed by the invention, the self-interference signal generated by simultaneous same-frequency full-duplex underwater acoustic communication can be effectively canceled, so that the system can demodulate the desired signal under strong self-interference conditions.

Description

technical field [0001] The invention relates to a digital self-interference cancellation method of an underwater acoustic communication system, in particular to a digital self-interference cancellation method of an asynchronous and simultaneous same-frequency full-duplex underwater acoustic communication system, belonging to the field of underwater acoustic communication. Background technique [0002] Underwater acoustic communication technology has a wide range of applications in the fields of military and marine development. In recent years, with the expansion of the scale of ocean development, people’s demand for underwater acoustic communication has developed from low-speed, single-service to high-speed, diversified services. The channel capacity of communication and the spectral efficiency of underwater acoustic communication network have attracted the attention of many scholars at home and abroad. Simultaneous same-frequency full-duplex communication allows underwater...

AI Technical Summary

Problems solved by technology

The above methods are all designed based on the radio communication system. At present, there is no self-interference cancellation method applied to simultaneous and same-frequency full-duplex underwater acoustic communication.

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