In this article fast fading in indoor environments is predicted, using the MR-FDPF algorithm. MR-FDPF (frequency domain par flow) is a FDTD like method that can compute indoor radio coverage at a very precise resolution (a few centimeters). Using the simulated points in particular regions, it is possible to plot the distribution of the power signal, and to fit this distribution with Rice laws. In order to confirm our results, real radio measurements have also been done. In the considered environment, MR-FDPF has been proved to be efficient for the prediction of statistics of fading channels in indoor environment.