Improving the Accuracy of Ray Tracing Estimation Considering Inhomogeneous Building Surfaces in Urban Environments

A Survey of Efficient Ray-Tracing Techniques for Mobile Radio Propagation Analysis

“…However, it is expected that the analysis accuracy would become degraded in an environment such that the effect of defuse scattering components is large. Note that [34] reports that the analysis error (RMS error) for the received power becomes approximately 1 dB less than that in conventional ray-tracing as indicated by the results of comparison with measurements.…”

“…One is the method proposed in [34]. In this method, it is assumed that the specular component of scattering waves, i.e., the wave in the specular direction, is dominant.…”

Electromagnetic Waves Propagating Around Buildings

“…Despite the above, it might be next to impossible to recognize the field strength of the electromagnetic waves in the whole area where wireless communication is utilized. Therefore proposals for a simulation method that can adjust the settling position of the base station or output have been made by many researchers with respect to several methods such as the one to estimate attenuation loss of the electromagnetic on a propagation route utilizing the building height in the communication area obtained by residence maps and its distribution (Kita et al, 2007;Kitao & Ichitsubo, 2008;Xia, 1997) together with the state of the roads (Ikegami et al, 1984;Walfisch & Bertoni, 1988) or the one to estimate the propagation route in accordance with the Ray Tracing method (Lim et al, 2008). However with these methods, difficulties are pointed out in purport that they just enables the attenuation amount of the electric field strength outdoors to be estimated roughly along the propagation route, and real values of the electric field strength are greatly different from the estimated values.…”

“…Studies to enhance the estimation accuracy by solving these problems are also under way. Landron and Lim (Landron et al, 1996;Lim, 2008) release reports stating to the effect that consideration of the outside wall shape of the building enhances estimation accuracy. In the meanwhile, proposal is by Axiotis (Axiotis & Theologou, 2003) with an estimation method of the electric field strength extended into the inside of the building.…”