SBR IMAGE APPROACH FOR INDOOR RADIO PROPAGATION IN LARGE EMPTY BUILDINGS/

In this paper we will propose a deterministic approach to model the ra dio wave propagation channels in large empty buildings. This technique applies the modified SBR method to find equivalent sources (images) i n each launched triangular ray tube, and sums the receiving amplitude contributed by all images coherently. In addition, vector effective an tenna height (VEH) is introduced to consider the polarization coupling effect resulting from the multiple reflection inside the buildings. W e verify this approach by comparing the numerical results in three can onical examples where closed-form solutions exist. The good agreement indicates that our method can provide a good approximation of high fre quency radio propagation inside buildings where multiple reflection is dominant. Work reported in this paper has shown that propagation loss in large empty buildings can vary considerably according to the geome trical configurations of buildings and polarizations. This SBR/image m ethod can be enhanced by including the wall penetration and wedge diff raction effects so that more complicated indoor environments with furn iture will be handled. Additional considerations, such as buildings cr owded with pedestrians are left for future studies.