A Practical Radiosity Method for Predicting Transmission Loss in Urban Environments

Abstract

<p>The ability to predict transmission loss or field strength distribution is crucial for determining coverage in planning personal communication systems. This paper presents a practical method to accurately predict entire average transmission loss distribution in complicated urban environments. The method uses a 3D propagation model based on radiosity and a simplified city information database including surfaces of roads and building groups. Narrowband validation measurements with line-of-sight (LOS) and non-line-of-sight (NLOS) cases at 1800 MHz give excellent agreement in urban environments.</p

Diffuse Scattering Model of Indoor Wideband Propagation

“…Trying to obtain a numerical model to support the theory, we chose the radiosity method, which is based on purely diffuse scattering and has been successfully used in the acoustics discipline [5], as well as in computer graphics and architectural lighting [6]. The radiosity approach has also been employed in radio coverage prediction in outdoor studies [7]- [9] and in combination with ray tracing in indoor environment [10]. Among its advantages we would like to highlight the relative simplicity and speed of the algorithm, while the lack of any information on specular reflections might be seen as a disadvantage.…”

Prediction of Transmission Path Loss in Indoor Environments with The Radiosity Method

“…The efficient deployment of mobile communication systems requires fast and realistic prediction of signal coverage. The radiosity method has been introduced in network planning and, in particular, for micro‐cellular urban environments, where heuristic propagation models are invalid . This method takes into account only the diffuse scattering of the radiation, which can adequately predict the distribution of the transmitted electromagnetic wave in microwave frequencies .…”