Spatial radio channel modeling for the design of new generation mobile communication systems

The market for broadband wireless communication systems has been growing enormously in the last years. Designing digital communication systems requires dedicated simulation approaches with an emphasis on the multipath propagation channel including directions of transmission and arrival. In this paper a stochastic channel model for the indoor propagation channel including path directions is presented. For the correct consideration of correlation in time and space the model is based on a stochastic process. Propagation paths appear, remain for a certain time-span, and finally disappear. The probability density functions and their parameters used to generate the properties of the propagation paths are determined from deterministic ray-tracing results. Additionally some first simulation results to demonstrate the function of the model and the potential of directive antenna systems in indoor environments are presented.