Accurate ray-launching analysis for indoor propagation through a high lossy wall

In this paper, we propose a simple accuracy improvement of the ray- launching analysis. This paper starts from deriving the analytical reference solution of the transmitted wave in the appropriate Green´s function problem. From the derived analytical solution, it is found out that the attenuation effect inside the wall in the ray-launching solution is estimated to be much smaller than that in the analytical solution, and it tends to be greater with increase of incident angle. So, taking into account this fact, we apply an accuracy improvement to the ray-launching solution by making the path length inside the wall slightly longer. By this simple improvement, one can easily compensate for the shortage of the internal attenuation in the ray-launching approximation. The validity of the improvement is finally confirmed by some numerical experiments. Here time harmonic factor e^-iwt is assumed and suppressed throughout the context.