There is an increasing demand for efficient and accurate indoor signal propagation prediction tools. A novel semi-deterministic approach based on a simple ray launching technique, the Monte Carlo method, and general statistics is developed. Without complicated calculations, all the electromagnetic issues, including diffuse scattering, are taken into account in the prediction using a new "motif concept". The motif model based on this approach is developed, implemented and tested. The signal strength as well as wide-band parameters can be predicted at very high speed. Software implementation of the model and first evaluations prove good performance and accuracy. A three-dimensional enhancement of the model is proposed.
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