A SBR algorithm for simple indoor propagation estimation

In this paper, indoor electromagnetic wave propagation is analyzed by using ray tracing method, which is based on high frequency ray launching or SBR technique. Here, three fundamental GO components of direct, reflected and transmitted rays are considered in the analysis. Taking into account three components only, the improved execution performance on most of indoor propagation models may be expected. Additionally, the physical indoor propagation model for a shooting angle may be considered as the corresponding non-physical tree construction model with the source as root. Providing the appropriate node number to every node of the tree, one may be able to refer the propagation history (total reflection/transmission number of times and its sequence) for the wave received at arbitrary observation point. The indexing described above may also lead us the required memory size reduction effect in the numerical procedure. Numerical calculations have been carried out for some simple indoor models, and by comparing the results of our method with those of the FDTD method, the validity of ours has been confirmed. It has also been found that computational time and required memory size reductions are both realized.