带内全双工水声通信空间域自干扰抵消方法

Spatial Domain Self-Interference Cancellation Method of In-band Full-duplex Underwater Acoustic Communication

摘要:

针对带内全双工水声通信的自干扰抵消技术，目前常通过模拟域或数字域自干扰抵消方法进行自干扰信号消除，但由于硬件设备问题，自干扰抵消性能存在上限。而空间域自干扰抵消常采用吸声障板或具有指向性的换能器完成，虽增加了自干扰抵消上限，但在工程应用中较为复杂，方法具有设备依赖性，且抵消能力有限。为进一步增加自干扰抵消上限并减少空间域自干扰抵消方法复杂度，基于阵列信号处理技术完成空间域自干扰抵消，并针对带内全双工水声通信中独有问题设计波束形成器，利用空域滤波抑制自干扰信号并增强期望信号，通过仿真及水池实验验证了本方法的实用性及抵消效果。

关键词:带内全双工;水声通信;自干扰抵消;波束形成

Abstract:

For the self-interference cancellation technology of in-band full-duplex underwater acoustic communication，the self-interference cancellation method in analog domain or digital domain is usually used to erase the self-interference signal. However，due to the problem of hardware equipment，the self-interference cancellation performance has an upper limit. The self-interference cancellation in spatial domain is often completed by sound absorption barrier or directional transducer. In this way，the upper limit of self-interference cancellation is increased， but the engineering application is more complicated. Also，this method has equipment dependence and limited cancellation capability. In order to further increase the upper limit of self-interference cancellation and reduce the complexity of self-interference cancellation method in spatial domain，this paper intends to complete self-interference cancellation in spatial domain based on array signal processing technology，and designs a beamformer aiming at the particular problems in in-band full-duplex underwater acoustic communication. The spatial filtering is used to weaken the self-interference signal and enhance the desired signal. The practicability and cancellation effect of this method have been verified by simulation and pool experiments.

Key words:in-band full-duplex(IBFD);underwater acoustic(UWA)communication;self-interference cancellation(SIC);beamforming