In real soundings of the Earth’s atmosphere, it has been found that the phase and amplitude of the signal received undergo strong oscillations at altitudes above the neutral atmosphere and below the Elayer of the ionosphere. This ionospheric scintillation effect is a consequence of multipath propagation resulting from inhomogeneities in the refractivity field of the ionosphere. Ionospheric scin...

This paper presents the first study of the modulation of polar mesospheric winter echoes (PMWE) by artificial radiowave heating using computational modeling and experimental observation in different radar frequency bands. The temporal behavior of PMWE response to HF pump heating can be employed to diagnose the charged dust layer associated with Mesospheric Smoke Paricles (MSP). Specifically, th...

We present results from a suite of models designed to simulate solar flare effects on the D and E region ionosphere. This includes spectrum, ionosphere HF radiowave propagation. A central component this system is development photoelectron ionization enhancement factors with higher energy resolution in soft X-ray spectral that can be used supplement existing schemes currently implemented upper a...

This paper presents an interference model of overlapping radio channels which allocate the same frequency band. The model is based on the INET Framework [12] of OMNeT++ [11] simulation engine and the raytracing tool Radiowave Propagation Simulator (RPS) [14]. By using our prediction model, we present a proposal for an easier integration of adaptive bit rate adjustment for wireless networks in O...

BACKGROUND It is presently unknown if stents used in the correction of artery stenosis are fully hemocompatible or if their implantation causes alterations at the level of the plasma membrane in red blood cells. METHODS We addressed this important issue by measuring the passive electrical properties of the erythrocyte membrane before and after stent insertion by means of dielectric relaxation...

This paper presents a comprehensive overview of Ultra-Wideband (UWB) measurements of all the empirical data available on various fading properties of the indoor radiowave communication channel. Our focus is on the essential propagation channel parameters which is used in the physics-based models. This overview is based on more than 50 measurement campaigns from 24 working groups in different co...

Telecommunications systems have evolved from the analog world to the digital world in two decades. This is particularly true for all categories of commercial satellite service: fixed, mobile, or broadcast. In the field of radiowave propagation modeling, however, the transition from the analog era to the digital era has been somewhat slower. Forcing the pace of propagation modeling has been the ...

Cognitive radio (CR) has been seen as a promising technology to make radio spectrum usage more effective by providing an opportunistic access for secondary users to the licensed spectrum areas. CR systems need to detect the presence of a primary user (PU) signal by continuously sensing the spectrum area of interest. Radiowave propagation effects like fading and shadowing often complicate the de...

The excellent radio frequency transparency of cold polar ice, combined with the coherent Cherenkov emission produced by neutrinoinduced showers when viewed at wavelengths longer than a few centimeters, has spurred considerable interest in a large-scale radiowave neutrino detector array. The AURA (Askaryan Under-ice Radio Array) experimental effort, within the IceCube collaboration, seeks to tak...