This paper presents new site specific propagation prediction methods for emerging personal communication system (PCS) services which will offer high capacity in urban settings. The propagation prediction models, composed of three dimensional dif· fracti"on and ray tracing, are being implemented as software tools on SUN computer workstations. A Geo'graphical Information System (GIS) software pac...

We have performed extensive radio channel measurements in different radio environments at 2.15 GHz frequency. A spherical array and a wideband radio channel sounder were utilized at the mobile station in order to characterize the spatial radio channel at the mobile. The measurement setup, presented in [1], enables the full 3D spatial and polarization characterization of the wideband mobile radi...

Ray-optical propagation models are often utilized for the prediction of the field strength (and delay spread) in mobile radio networks. However, the practical usage of these deterministic models is limited due to their high computational demands. A new method for the acceleration of ray-optical models is presented in this paper. It is based on a single preprocessing of the database in which the...

A discrete Bayesian filter (DBF) was developed to work as a pattern matching technique with database correlation for mobile location. The database is constructed using a 3D deterministic radio wave propagation prediction model. Three methods to yield final location estimates are presented and compared according to their accuracy. We carried out field measurements in a GSM network deployed in a ...

The migration of UMTS carrier frequencies to the 2 GHz band has stimulated interest in radio coverage in urban environments. This paper examines the problem of poor signal quality close to buildings. It uses simulation based on approximate propagation models in a “generic” urban environment to estimate the relationship between size of coverage black spots and distance from the serving BS. Consi...

Radio wave propagation prediction is a fundamental prerequisite for planning, analysis and optimization of radio networks. For instance coverage analysis, interference estimation or channel and power allocation all rely on propagation predictions. In wireless communication networks optimal antenna sites are determined by either conducting a series of expensive propagation measurements or by est...

| Ray-optical propagation models are often used for the prediction of the field strength (and delay spread) in wireless mobile communication networks. But these models suffer from long computation times. For large areas in urban or indoor scenarios the computation times are in the range of hours which is too long for the planning of mobile radio networks. A new method for the acceleration of ra...

For proper planning and optimisation of radio network coverage quality at the mobile station terminals, prediction of propagation path loss with reasonable accuracy is important. This research work proposes the application of a hybrid neural modelling technique to predict of signal coverage propagation losses in typical urban environment. The modelling technique is based on combining a conventi...

In this paper we consider a typical urban scenario for MANET deployment. Urban scenarios differ profoundly from open space scenarios, which so far have been the main object of study in MANET research. Moreover, they are of great interest for actual MANET deployment in the real-world. We study the main characteristics of urban scenarios in terms of radio propagation, node connectivity, and traff...

We investigate the different dominant propagation mechanisms in an urban macroand microcellular base station (BS) installation with a special focus on the application of smart antennas by means of adaptive antenna array measurements. We demonstrate that the congruence of the geometrical mobile station (MS) position and the dominant direction of arrival is only fulfilled for macrocellular BS ins...