A new universal approach to modeling and simulation of UWB channels containing convex obstacles using SPICE-like programs

The paper presents a new approach to time domain modeling of UWB channels with elliptical shape convex obstacles. Rational approximation exploiting the vector fitting algorithm (VF) is used for deriving the closed form impulse response of a diffraction ray creeping on a convex obstacle. The VF algorithm is performed with respect to new generalized variables proportional to frequency but also taking into account geometrical parameters of the obstacles. Obtained impulse response is a sum of exponential functions. As a consequence, in simulations of electromagnetic (EM) wave propagation we can perform simulations implementing SPICE-like programs.