PROPAGAZIONE IN AMBIENTE INDOOR: CONFRONTO TRA TECNICA DEL RAY-TRACING E TRASFERIMENTO RADIATIVO

In this paper the authors report how - under specific and limited conditions- radiative transfer is a useful tool for power fluctuation predictions in indoor wireless propagation channels. The limits of radiative transfer to model such channels are investigated by comparison with ray tracing results. Radiative transfer overcomes the deterministic description of the ray tracing technique, whose solution is valid for a given spatial configuration of the scatterers in a particular geometry. Radiative transfer results are compared with the second order statistics (specific intensity and spatial correlation) of the received signal in a two-dimensional geometry with randomly placed scatterers. We conclude that for scatterers with small enough extinction cross width and density (in number of scatterers per square meter) the radiative transfer approach yields fairly accurate results.