The protection of existing radio users is an important consideration in the design and deployment of high frequency (HF) powerline communication systems. Applicable radiated emission standards are now under development, most notably NB30, which is now in force within Germany. There remains, however, an ongoing debate as to the effectiveness of the currently specified field strength limits in pr...

In station site selection, i.e., the process of determining locations for installing base stations in mobile communication systems, it is highly advantageous to be able to estimate the propagation loss in a manner that allows accurate modeling of interference from surrounding geographical features and objects on the ground. Moreover, active application of time-space signal processing, represent...

Medium-frequency (MF) ground wave propagation is playing one of the most important roles for a long distance communication. When the surface impedance of the earth along the propagation path changes the ground wave propagation is influenced strongly as it occurs when the radio wave traverses a border from an urban area to a suburban area or viceversa [1]-[4]. The measurements of the ground wave...

Vehicular ad hoc Networks (VANETs) enable vehicles to communicate with each other as well as with roadside units (RSUs). Although there is a significant research effort in radio channel modeling focused on vehicle-to-vehicle (V2V), not much work has been done for vehicle-to-infrastructure (V2I) using 3D ray-tracing tools. This work evaluates some important parameters of a V2I wireless channel l...

In this paper the impact of the base station antenna horizontal beamwidth on radio network capacity in WCDMA cellular networks in the downlink direction is studied. Influence of coverage overlapping and radio propagation environment together with antenna beamwidth are also studied. A radio network planning tool is used to simulate WCDMA macro cellular network performance in urban and suburban a...

in this study, absorption of high frequency radio waves in the ionospheric plasma have beeninvestigated. the wave equation was obtained in terms of ionospheric parameters. the numerical values ofthe absorption have been calculated for 4 mhz, 4.5 mhz and 5 mhz waves. the necessary parameters forcalculation have been obtained using an international reference ionosphere (iri) model. the altitudina...

A ray tracing based cellular coverage simulator has been parallelized in order to speed up excecution. The simulator has been developed for accurate prediction of radio wave propagation in urban microcells. It combines a vertical plane model simulating the wave propagation over the buildings and a horizontal plane model simulating the wave propagation in the street canyons between the buildings...

Most applications for location based services rely on a precise determination of the location of the mobile terminal. Especially in urban and indoor environments multipath propagation leads to very complicated scenarios without line-of-sight between the mobile terminals and the base stations. In these scenarios a localization technique based on simple delay evaluations and/or GPS is not accurat...