Corner and rooftop diffraction in radiowave propagation prediction tools: a review

Abstract

Accurate radiowave propagation prediction tools are essential for the optimal design of future mobile telecommunication services. In recent years, raysptical methods have been gaining in popularity, especially for urban radiowave propagation prediction. One of the key propagation mechanisms incorporated in any ray-tracing technique is diffraction. In this paper, we present new diffraction coefficients for both solid and hollow dielectric wedges. The theoretical predictions are validated throughout against controlled laboratory measurements. For the solid wedge diffraction problem, we compare our predictions with those obtained using the widely used Luebbers' solution. It is shown that the latter one is in error as much as 10 dl3 in shadow regions.

The Current Progress and Future Prospects of Path Loss Model for Terrestrial Radio Propagation

“…RT is the most widely used deterministic channel model method [24][25][26]. According to the modeling principle, RT can be classified into forward RT, backward RT, and mixed RT.…”

Urban Propagation Modeling for Wireless Systems

“…Researchers conducting simulation studies using ray-tracing models [11,20,21,24,26,33,38,40,42,64,80,90] and waveguide models [44,[69][70][71] seek to understand the mechanisms by which the signals propagate through streets and around buildings. The aim of these simulations is to predict the first-order propagation effects, and the results of these simulations are typically averaged to make a comparison to the local average received power obtained by measurements.…”