机舱内部超宽带确定性信道建模

将室内无线信道仿真中常用的几何光学和射线追踪技术,引入到对客机机舱内部的超宽带(Ultra-WideBand,UWB)信道研究当中。信道仿真的主要算法基于一种称为射线密度归一化(RayDensityNormalization,RDN)的方法。该方法使用射线密度的概念来计算每条射线对接收点处总信号强度的贡献。为了验证方法的有效性,实验构建了一个Boeing737-200客机机舱模型进行仿真。仿真将接收机设置在每个座位的顶部、扶手和底部,以研究不同水平高度信道的差别。仿真中对路径损耗和均方根(RMS)时延扩展两类大尺度信道参数进行了统计和分析,部分仿真结果与国外实测结果进行了对比。对比结果证明了仿真结果的保真度以及现有仿真工具的有效性。

Deterministic Modeling Method for Aircraft Inside-cabin UWB Channels

A deterministic channel modeling method using geometrical optics and ray tracing technique is introduced into the ultra-wide band (UWB) channel characterization inside the passenger cabin of a commercial aircraft. The main algorithm is based on a method named ray density normalization (RDN) which uses the ray density concept to determine the contribution of each ray to the total field at the receiver. To validate the algorithm, a simulation test in a simplified cabin model of Boeing 737-200 is set up. Receivers are placed at the headrest, armrest and footrest levels of passenger seats throughout the aircraft cabin to find out the differences of channels at different heights. Two large scale aspects of the channel characteristics are addressed in the simulation results: ① the distance dependence of path loss, ② the root mean square (RMS) delay spread. Part of the simulation results is compared with the measurements of some experiments cited. The comparison shows that the channel characteristics extracted from the simulation and the measurements are matched, thus demonstrating the fidelity and validity of the simulation tool.