Hybrid FDTD/UTD indoor channel modeling. Application to Wifi transmission systems

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