Modeling indoor propagation using an indirect hybrid method combining the UTD and the FDTD methods

Classical theories such as the Uniform Theory of Diffraction (UTD) use analytical expressions for diffraction coefficients [l]. These methods are convenient for canonical problems for objects much greater than the wavelength and enable to rise in frequency. For more complex and smaller scattering structures, the rigorous methods like the Finite Difference Time Domain method (FDTD) is more adapted [2]. In this paper, we present an original approach, combining the advantages of these two complementary methods. So, the pmpagation channel can be accurately characterised.