Underwater Acoustic Channel Modeling And Simulation Realization

Underwater acoustic (UWA) communication technology is the primer tool to study and develop the ocean. The complexity of stochastic UWA channel's multi-path propagation with time-, frequency-,space-varying characters makes it one of the most challenging domain of communications nowadays. In addition, there are many other problems encountered in UWA channels such as larger ambient noise, much-limited bandwidth, and much-extended propagation latency, which severely reduce the reliabilities and validity of the UWA communication system.With the rapid development of computer techniques, simulation research has infiltrated into every technology at present. Communication simulation, compared to conventional analysis methods such as analysis-by-circuit, has more advantages, and becomes a more popular tool to design and analyze communication systems. And it was also applied to UWA communication domains, especially to the UWA channel.This article focuses on UWA channel modeling and simulation research. Firstly, five modeling techniques based on wave equation are introduced; especially the ray theory and its feasibility, as well as the characters of the UWA channel. Second, we explain the model of span, present an efficient algorithm for finding eigenrays in stratified ocean. In the next part, the eigenpath UWA Communication Channel model is discussed mainly. The channel model is analyzed theoretically in propagation attenuation and latency, multi-path components, and Doppler shift, so the reasonability and the feasibility of the model are verified.In the last part, the simulating of the model and the interface with MATLAB is presented. At the same time, the input parameters in the model are explained in the physical background. Through the simulation, suitability of the model is tested.