An Enhanced Method based on ILDC Theory for the Computation of NearFresnel Zone Diffraction from Finite Edged Scatterers

In this paper an accurate method for the calculation of the diffracted electromagnetic field from rectangular wedges in the near and Fresnel-zone field areas is introduced. The proposed technique, which is based on the analytical method of physical theory of diffraction (PTD), is applicable for the radio-propagation prediction in urban outdoor microcellular environments where the near-field diffraction from building wedges is one of the dominant propagation mechanisms, mainly in the non-line-of-site (NLOS) regions. Comparisons between the results obtained from this method with the corresponding results based on different high- frequency diffraction techniques in the far-field area, as well as the efficient convergence of the simulation results in the nearFresnel-zone field areas, validate the excellent accuracy of the proposed methodology, as well as the significant correction of the received signal near the building wedges.