Fast two-dimensional diffraction modeling for site-specific propagation prediction in urban microcellular environments

This paper presents fast two-dimensional (2-D) diffraction modeling in the horizontal plane for site-specific propagation prediction in urban microcellular environments. The modeling makes three contributions which are: (1) the introduction and use of an extended formulation for multiple building forward diffraction; (2) a novel equivalent source simplification for parallel street multiple diffraction; and (3) the inclusion of reflections from curved surfaces of street building corners. Comparison with measurements and simulation of published results validate the 2-D modeling that significantly reduces the computation time and overcomes the limitation and difficulty of existing techniques for multiple diffraction