Analysis of over-rooftop multiple-building diffraction in urban areas with shadowing caused by terrain effects

A hybrid uniform theory of diffraction (UTD) ¿ physical optics (PO) formulation for the analysis of the multiple diffraction which takes place in urban environments where a cylindrical bare hill causes shadowing of the transmitter from the receiver (a non-line-of-sight situation) is presented, thus furthering a previous study published by the authors in which the hill is modeled as a wedge. The mentioned UTD-PO solution, validated by numerical results from technical literature, has a good computational efficiency, while at the same time increasing the versatility over other methods for the analysis of the same scenarios, since the presented hybrid formulation allows for the study of the above-mentioned environment when the urban area consists of a small number of buildings.