Abstract:

For underwater wireless communication scenario, a disk scattering model which is closer to the actual environment is introduced. Assuming that the local scatterers are distributed within a disk centered on the receiver（Rx）. The scatterers are in a higher concentration around the disk center and a lower concentration far from it. Polar coordinates are used to model the distribution of the scatterers which result in the simplicity of computational complexity. Furthermore, closed-form expressions for the joint density function（PDF） of the time-of-arrival（TOA） and angle-of-arrival（AOA） have been derived, as well as for the joint PDF of the angle of departure（AOD） and AOA. From the joint distributions, the marginal PDFs of the TOA, AOA, and AOD are derived. Finally, the average delay and the delay spread of the proposed disk scattering model are analyzed. Based on the above research results, it provides an important channel model tool for underwater acoustic systems analysis.

Key words: geometrical disk scattering model, underwater acoustic communication, time of arrival, angle of arrival, angle of departure

摘要：

针对水下无线通信场景，引入了一种更接近实际环境的圆盘散射模型，假设散射体分布在以接收端Rx（Receiver）为中心的圆盘内，且散射体密度距离圆盘中心越近越密，距离越远越稀疏。引用极坐标对散射体的分布进行建模，简化计算复杂度，并推导出到达时间（Time-Of-Arrival，TOA）和到达角（Angle-Of-Arrival，AOA）以及发射角（Angle-Of-Departure，AOD）和AOA的联合概率密度函数（Probability Density Function，PDF），以及发射角（Angle-Of-Departure，AOD）和AOA的联合PDF。再根据联合分布推导出TOA、AOA和AOD的边缘PDF。分析了所提出的圆盘水声（Underwater Acoustic，UWA）信道模型的平均时延和时延扩展。基于以上研究结果，为水声信道系统分析提供了一个重要的信道模型工具。

关键词: 几何圆盘散射模型, 水声通信, 到达时间, 到达角, 发射角