We give an overview of recent developments in the modeling radiowave propagation, based on machine learning (ML) algorithms. identify input and output specification architecture model as main challenges associated with ML-driven propagation models. Relevant papers are discussed categorized their approach to each these challenges. Emphasis is given presenting prospects open problems this promisi...

The present work investigates the propagation of a radio pulse in an unmagnetized, statistically inhomogeneous plasma causing regular refraction and anisotropic scattering. Using the framework of geometrical optics, a Fokker-Planck equation is derived and integrated within a two-moment approximation. The method allows a continuous transition from weak to strong angular scattering and yields pul...

Refraction phenomena that occur in the lower atmosphere significantly influence the performance of wireless communication systems. This paper provides an overview of corresponding computational methods. Basic properties of the lower atmosphere are mentioned. Practical guidelines for radiowave propagation modeling in the lower atmosphere using ray-tracing and parabolic equation methods are given...

This paper describes, in a neurofuzzy framework, a method for the classification of different modes of radiowave propagation, followed by generation of linguistic rules justifying a decision. Weight decay during neural learning helps in imposing a structure on the network, resulting in the extraction of logical rules. Use of linguistic terms at the input enables better human interpretation of t...

Since the publication of special collection on Radio Channel Modeling for 5G Millimeter Wave Communications in Built Environments new frequency bands, antennas and transmission techniques are being proposed to cope with demanding requirements beyond-5G systems. In this commentary, we provide an overview technology how it will impact radiowave propagation characteristics, way radio channel model...

We study the implications of the LPM effect for the Cherenkov radiation of EeV electromagnetic showers in the coherent radiowave regime for ice. We show that for showers above 100 PeV the electric field scales with shower energy but has a markedly narrower angular distribution than for lower energy showers. We give an electric field frequency and angular spectrum parameter-ization valid for sho...

Australian vegetation is fire-prone. Every year, wet and dry sclerophyll forests of Western Australia, southeastern Australia and grassland ecosystems of the northern part of the continent are subject to high intensity fires. The sclerophyll vegetation contains up to 2.71 % of the element potassium. The element exists in plants’ organic matrix: attached to the oxygencontaining and carboxyl func...

Interstellar scattering can irretrievably blur the images of compact radio sources when examined with extremely high resolution. Because of this effect, diffraction-limited observations of extragalactic sources with a n Earth-Moon baseline will only be possible a t frequencies above about 7 GHz, in which case the resolution will be 5 2 0 parcsec. Preliminary observations to determine the potent...

by an electrode while an indi erent electrode (antenna) was attached to the patient. The indif ferent electrode allowed for the removal of the current entering the patient and channeled the electricity back into the electrosurgical unit. This prevented the buildup of static electricity so that electrical shocks were not caused to the patient or the operator. This recycling of current allowed th...