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- 3D Indoor Radio Coverage for 5G Planning: a Framework of Combining BIM with Ray-tracingPublication . Louro, João; Fernandes, Telmo Rui; Rodrigues, Hugo; Caldeirinha, Rafael F. S.This paper presents a framework to predict indoor radio wave coverage in buildings. Such method includes the capability to import BIM (Building Information Modelling) files that contain structured physical geometry and dimension data, including the material types that are of uttermost importance in evaluating their dielectric properties. Appropriated extraction of physical and dielectric attributes of the building elements was used as input to a 3D radio wave propagation ray-tracing developed in MatLab that allows the prediction of the received radio signal level at any location within the computational volume. Results are presented for line-of-sight contributions and first and second order reflections. Despite the generic nature of the proposed framework, prediction results are presented at 3.6 GHz, envisaging emerging 5G indoor radio coverage.
- Timber Log Based Barrier for Electromagnetic Site ShieldingPublication . Tribovane, Bruno; Louro, João; Caldeirinha, RafaelThis paper presents the development of a periodic array consisting of timber logs for electromagnetic site shielding. With this study, it is possible to understand the effects caused by wooden barriers in order to achieve a better shielding effectiveness (SE) or electromagnetic transparency at selected frequencies to control the exposure of electromagnetic radiation on the population and to reduce co-channel interference in telecommunications. The spacing between wooden poles' centre is parametrised within a simulation environment in the frequency range of 1.5 to 6 GHz and the results provided by the simulation software are assessed against measurement results of a real site barrier prototype. Simulation and measurement results presents a good agreement, where the pole's spacing affects SE significantly. As a replacement to current barriers, mainly on motorways, a low industrial processing and low-cost wooden barrier with specified electromagnetic characteristics may be used.
- Building Information Modelling Conversion for Radiowave Propagation StudiesPublication . Louro, João; Fernandes, Telmo Rui; Rodrigues, Hugo; Caldeirinha, RafaelThis paper presents a Building Information Modelling (BIM) data conversion algorithm for radio wave propagation studies in indoor and outdoor environments. The tool presented here allows to extract the geometrical and physical information of BIM models present in IFC2×3 files. The first conversion step is done using the IFCOpenSHell library through a Python interface and the second one is done using MatLab. Following MatLab results extraction, studies of propagation will proceed. The extracted information allows ray tracing simulations and/or radiowave propagation studies through a real-scale simulation scenarios, spending less computational time. The results presented refer to a small wooden house for a frequency of 3.6 GHz, for 5G, using a directional transmitter antenna and an omnidirectional receiving antenna. It is possible to check the result for the direct component and first, second and third order reflections.