The increase of potential applications of wireless networks in Indoor environments calls for robust and efficient tools for predicting the wave propagation in such complex environments. The ParFlow technique is a discrete approach which accurately reflects the behavior of wave propagation but in turn requires very high computation and time resources. Initially this method has been implemented in a parallel architecture to reduce the computation time. In this paper a new resolution scheme is proposed to solve the discrete ParFlow equations. This approach is based on a multi-resolution formulation in the Fourier domain. The major result of our approach is that the computation complexity may be settled in two parts: -Firstly, the multi-resolution pyramid is built (taking into account the geometry arrangement of the indoor environment). -Secondly, the propagation from a point source is evaluated through the soft pyramidal architecture with a high gain in terms of computational efficiency. We guess that this approach could increase the interest of the ParFlow technique which could be more accurate than ray-tracing methods at least in a theoretical point of view.
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