Spatio-Temporal Channel Model for Broadband Wireless Communication Systems

本研究的目的是在室内和室外环境的标准时空信道模型的发展。为此，采取了两种方法：时空信道探测，测量时空信道参数在真实的环境中，和光线跟踪模拟，预测信道特性的基础上建立数据库。这两种方法都将信道分成几何路径，并估计出发和到达方向、延迟时间、多普勒频率和路径增益。研究了这些路径的统计特性，得到了标准的信道模型，并在郊区微小区、城市微小区和室内环境中进行了实验验证。提出了一种新的方法来处理道路和到达方向接近平行的情况，将时空信道探测器扩展为多输入多输出（MIMO）结构，并在2.45 GHz下制作了样机进行测试。同时，利用矢量网络分析仪和天线位置控制器，建立了另一种简化的信道探测器。它已被用于室内和短距离无线信道的几何路径发现。它还被用来研究墙壁表面的非镜面散射。

This study aimed at the development of the standard spatio-temporal channel model for indoor and outdoor environments. Two approaches are taken for the purpose : the spatio-temporal channel sounding that measures the spatio-temporal channel parameters in the real environment, and the ray-tracing simulation that predicts the channel properties based on the building database. Both approaches separate the channels into geometrical paths and estimate the directions of departure and arrival, delay time, doppler frequency, and path gain. Statistical behavior of these paths are focused in the study to obtain the standard channel model.The ray-tracing simulator has been validated in the suburban microcell, urban microcell and indoor environments by comparing with the experiments. A new method has been developed to treat the case when the road and the direction of arrival are close to parallel.The spatio-temporal channel sounder has been expanded to the multiple-input multiple-output (MIMO) architecture, and the prototype has been fabricated at 2.45 GHz for the test operation. Simultaneously, another simplified channel sounder using a vector network analyzer and an antenna position controller has been built. It has been used for the indoor and short-range wireless channels to find the geometrical paths. It has been also used to study the non-specular scattering from the wall surface.