Experiments in modeling the space-time indoor wireless communication channel

Most previously proposed statistical models for the indoor multipath channel include only time of arrival characteristics. However, in order to use statistical models in simulating or analyzing the performance of array processing or diversity combining, it is also necessary to know the statistics of the angle of arrival and its correlation with time of arrival. In this paper, a system is described which was used to collect simultaneous time and angle of arrival data at 7 GHz. Data processing methods are outlined, and results of data taken in two different buildings are presented. Based on the results, a model is proposed that employs a clustered "double Poisson" time of arrival model. The angular distribution is also clustered, with uniformly distributed clusters, and arrivals within clusters that have Laplacian distribution.