Abstract:In the traditional half-duplex underwater acoustic communication system, the communication signal propagation channels are often assumed to be sparse channel for subsequent processing. However, according to the current measured results, when the In-Band Full-Duplex (IBFD) underwater acoustic communication is realized in the form of separate equipment, the short-range propagation process from the transmitting transducer to the near-end receiver is affected by the electronic cabin of the communication modem, resulting in the complexity of Self-interference (SI) components and channels. In order to further understand the influence of shell materials on SI intensity and complexity of the propagation path, as well as the difference of SI signal components received under different near-end receiver arrangements, this paper simulate the Self-loop Interference (SLI) signals of two shell materials and different near-end receiving positions based on the finite element method. The main components of the SI signals received at each receiving position are verified through auxiliary simulation, and the characteristics of the SI channel are analyzed to provide preliminary theoretical support and basis for subsequent SI suppression and SI cancellation in each domain.
