Frequency-domain analysis of multiple diffractions of spherical waves by a rectangular building in wireless channel

In this paper deterministic modeling is used to investigate the field at receiver after multiple diffractions of spherical waves by rectangular building in microcellular scenario at frequencies 2 GHz (for 3G), 5 GHz and 60 GHz (for 4G). Higher order diffraction coefficients (Slope diffraction terms) are used to compute the diffracted field over consecutive wedge faces. Both soft and hard polarizations have been considered. Source is assumed to be above, level with or below the building height. Depending upon transmitter height, ray contributions include single and double order diffraction from building edges, ground reflection, and direct waves.