Cancellation of multiple interferers in communication signal

Abstract

The broadband impulse signal emitted by marine animals is difficult to separate from the communication signal and contaminates the phase of the symbol, causing performance reduction. In a previous study, the Green’s function of this undesired signal was estimated for each path, and the impulse signal was spatially canceled by combining it with adaptive time-reversal processing [Kim et al., J. Acoust. Soc. Am. 150, A195 (2021)]. However, when the number of impulse signals to be canceled exceeds the number of receivers, the degree of freedom in the process of designing the weight vector is limited. In this presentation, we propose an approach that provides degrees of freedom by treating the signal vectors from multiple arrivals as a single constraint. The spatially nulling impulse signal without distorting the phase of the communication signal showed a remarkable improvement in communication performance in the seagoing experimental data. [Work supported by the Agency for Defense Development, South Korea, under Grant UD200010DD.]