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...

We present a problem solving paradigm called generate, test and debug (GTD) that combines associational rules and causal models, producing a system with both the efficiency of rules and the breadth of problem solving power of causal models. The generator uses associational rules to generate plausible hypotheses; the tester uses causal models to test the hypotheses and produce a detailed charact...

Abstract A high frequency asymptotic technique based on the Uniform Theory of Diffraction (UTD) is employed for building interior imaging. The analysis is implemented using a set of heuristic diffraction coefficients for dielectric wedges and corners with ray-tracing that accounts for multiple through-wall interactions within building. Comparisons with experimental data of the images formed by ...

Arno Formella Universität des Saarlandes, FB 14 Informatik, 66041 Saarbrücken, Germany Abstract—We present a very efficient algorithm which calculates deterministically the path losses, delay profiles and other characteristics of a mobile channel. The algorithm can be used both for indoor and outdoor environments. We apply the technique of tracing rays and compute reflections, transmissions and...

Previously published equations for diffraction tomography do not solve the “two and one-half dimensional problem” (point source illumination of two-dimensional geology) if sources and receivers are confined to linear arrays. In spite of this lack of a formal solution, useful images can be formed by the application of twodimensional formulas to such problems. The estimation of difference fields....

A practical aspect of over-rooftop multiple-building forward diffraction from a low source is presented, including two formulations and an introduction of their application. In particular, the low-loss formulation for multiple diffraction exposes a factor that can account for strong over-rooftop radio propagation. Both lowand high-loss formulations take the advantages of the uniform geometrical...

This paper discusses development of physics-based models for bistatic scattering. We generalize parametric equations for monostatic scattering mechanisms in a plane to achieve analogous bistatic approximations. Combination of these mechanisms, as separable azimuth and elevation components, allows 3-D modelling of six scattering primitives: sphere, tophat, trihedral, dihedral, cylinder, and flat...

A.N. Norris and J.D. Achenbach The Technological Institute Northwestern University Evanston, IL 60201 Crack diffraction in a transversely isotropic material is analyzed. The solution is given for the diffracted field generated by incidence of a plane time-harmonic wave on a semiinfinite crack located in a plane normal to the axis of symmetry of the material. The exact solution is obtained by Fo...