The installation of indoor radio systems requires rather detailed propagation characteristics for any arbitrary configuration, so appropriate wave propagation model must be established. In spite of a number proposed solutions for optimal BS stations planning in WLAN environment, it is difficult to say that we have completely satisfied solution. We developed neural network propagation model that...

In this paper, rainfall effect on the VHF radio-wave propagation in a tropical forest is further studied in details. Theoretical study and experimental investigations are performed with the help of a four-layered model for forested environment. It is found that the lateral wave traveling along the air-canopy interface, the direct waves, and the ground reflected waves are the main modes for VHF ...

In this paper we use UWB measurements for bandwidths up to 3GHz to present a framework for statistical modeling of the indoor radio channel propagation characteristics that are pertinent to precise indoor geolocation using time-of-arrival (TOA) estimations. Accuracy of indoor geolocation systems relies on the strength and TOA of the direct path (DP) in the channel profile. Based on UWB measurem...

Precise modeling of radio propagation is necessary for experiencing the benefits of wireless technology for indoor environments. Among many modeling techniques, the ray tracing based prediction models become popular for indoor wireless radio propagation characterization. Though the ray tracing models are popular, their key deficiency is the slower performance. In this paper, an accelerated tech...

in Greater Detail Development of High-Performance Aircraft Mounted Synthetic Aperture Radar Seiho Uratsuka . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Development of Cloud Profiling ...

Accurate analysis of electromagnetic wave propagation in tunnels has important applications in the areas of mobile and wireless communications. In this paper a fully vectorial finite element base propagation model is developed for blocked straight and curved tunnels. Effect of different vehicles, location of vehicles and number of vehicles inside tunnels is analysed. It is shown that the basic ...

This work describes a complete indoor location system, from its creation, development and deployment. This location system is a capable way of retrieving the position of wireless devices using a simple software solution, no additional hardware is necessary. The positioning engine uses artificial neural networks (ANN) to describe the behaviour of a specific indoor propagation channel. The traini...

Faria Junior , Jason Paulo Tavares; Lima Siqueira , Gláucio (Advisor).Radio signal predictions for indoor Locations With Transmitter in microcellular environment . Rio de Janeiro, 2003. 100p. Doctor T. Departamento de Engenharia Elétrica, Pontifícia Universidade Católica do Rio de Janeiro. In this work, a software tool has been developed that provides accurate, sitespecific radio signal predict...

This paper presents a simple calculation method for predicting the propagation path loss of radio wave passing through dielectric obstruction between transmitter (Tx) and receiver (Rx). In this paper, characteristics that is obstructed by concrete beam on ceiling in large indoor environment, such as those seen factories warehouses, are investigated. The frequency 920-MHz band, used Internet-of-...