A run-time efficient three-dimensional radio propagation prediction model is presented in this paper. The model allows mobile network operators to predict the outdoor and the outdoor-to-indoor coverage in dense urban areas using one general prediction model. It integrates almost all relevant propagation phenomena in dense urban areas with an accuracy comparable to the results of dedicated predi...

This paper reports the measurement and analysis of wideband radio channel in urban propagation environment. RMS delay spread values are evaluated as well as the coherence bandwidth of the channel is derived by the frequency correlation function for 0.9 correlation. Furthermore, delay windows and signal to self-interference ratios are reported. Mean delay spread was found 0.353 μs and 2.061 μs f...

| 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...

The increase in mobile communications traffic has led to heightened interest in the use of ray tracing (RT) methods together with digital building databases for obtaining more accurate and efficient propagation prediction in urban microcellular environments. In this paper, a novel quasi three-dimensional (3-D) RT algorithm is presented by taking into account the advantages of both the image the...

A computational tool for application to educational Electromagnetics is presented. Integrating a set of numerical modules, it allows the simulation and demo of several radio wave-propagation scenarios at the Earth surface. The application was developed using MATLAB and includes field interference due to ground reflection, ray-tracing in a stratified atmosphere, sub-refraction mirage effects, si...

This paper presents the measured propagation characteristics like a path loss, delay spread and angular spread for urban environments in Jeju at 781 MHz. Measurements were made with a wide band MIMO channel sounder using a pseudo noise (PN) mode, 50 Mcps, 20 ns resolution and 40.96 μs maximum delay. Base station (BS) antenna height of 5 m was tested with a mobile station (MS) antenna height of ...

The paper describes measurements of radio propagation at 2 and 5 GHz in urban environments in Vienna, Austria, and Ilmenau, Germany, and in a rural highway environment near Salzburg, Austria, taken with virtual and physical antenna arrays. Multiple antenna elements at both the base and the mobile stations permit, by estimation with superresolution algorithms, evaluation of directions-of-arrival...

This work presents an algorithm to perform radiowave coverage predictions in urban environments using the Uniform Theory of Diffraction (UTD). The ray-tracing algorithm is based on the image theory for a quasi-3D environment. Multiple reflections and diffractions are considered through the separation of multipath components into four different classes, used to determine the scattered field. The...

We demonstrate long-distance (≥100-km) synchronization of the phase of a radio-frequency reference over an optical-fiber network without needing to actively stabilize the optical path length. Frequency mixing is used to achieve passive phase-conjugate cancellation of fiber-length fluctuations, ensuring that the phase difference between the reference and synchronized oscillators is independent o...

G , ~ H ~ +G,H, +CG,H, i=l Abstract This paper presents a proposed model in an explicit form and its simulation results for characterizing wideband line-of-sight (LOS) radio channel in an urban microcellular environment. The model is fast to compute, easy to implement, and only those rays that reach the receiver locations are calculated. Effect of street-grid, with any number of crossing street...