Planning Tool for LMDS Coverage Using 3D Geographic Information System Data

Local Multipoint Distribution Services (LMDS) Network operating in 40.5 – 43.5 GHz band in Europe requires relevant planning tool for its deployment. An accurate knowledge of the propagation environment (buildings, trees...) is necessary especially in urban areas. This paper presents software based on Ray Tracing method using 3D Geographic Information System (GIS) database. Several series of simulations were done and the effects on propagation issues of some parameters were interpreted. Measurements were also achieved and were compared with simulation curves. Finally, cosecant-squared and switch beam antennas are briefly presented as solutions to avoid shadowed zones and to improve coverage area.