A simplified method for computation of scattered fields by the lamp-posts along a boulevard used for wireless communications in 2-GHz band

Abstract

In this paper a simplified object specific ray tracing method is proposed to solve the important propagation problem of scattering by the lamp-posts. In fact, radiation from the transmitter antenna is modeled with a two ray incidence model and unknown currents on lamp-posts are computed using the Multi-Level Fast Multi-pole Method (MLFMM) which is an extension of the MoM (Method of Moments). In addition, scattering by lamp-posts is computed using the superposition of current elements electric fields based on the discrete complex image method (DCIM) in presence of a real ground with complex relative permittivity. The scattered near fields are considered instead of far fields. Based on this assumption, we use the generalized pencil-of-function (GPOF) method in DCIM. As another step in simplification, only single scattering is considered. Single scattering means that the scatterers are considered independently and their mutual effects are neglected. Another step is neglecting the scattered fields of the farther lamp-posts. To get closer to reality, lamp-post structure is considered with more details than the previous works. Although several simplifications are made and more details are added, it is shown that this method has adequate accuracy for propagation purposes. Significant gain in time and memory saving is achieved using above mentioned simplifications.