Abstract

Current cellular planning tools often utilize inaccurate models for the electromagnetic wave diffraction of the corners and edges of buildings.  These models lead to significant errors in RF coverage predictions for cellular systems in urban environments, making explicit measurement of the coverage pattern necessary.  In our work, we are developing highly accurate diffraction models for the corners and edges of building.  These models consider the specific orientation of each corner or edge feature as well as the composition of the building materials.  Several practical materials are currently being studied, including brick, concrete and glass.  Diffraction models are then determined with the assistance of a finite-difference time-domain (FDTD) numerical solution of Maxwell's equation.