How can our radios receive signals from stations beyond line of sight? One common mode transmission and reception radio waves is “skywave,” or ionospheric propagation. In skywave transmission, a station transmits medium high frequency (MF HF) away the Earth toward ionosphere, an atmospheric layer extending approximately 50-400 miles (approximately 80-640 km) above ground. The ionosphere gets it...

To implementation of mobile ad hoc network wave propagation models are necessary to determine propagation characteristic through a medium. Wireless mobile ad hoc networks are self creating and self organizing entity. Propagation study provides an estimation of signal characteristics. Accurate prediction of radio propagation behaviour for MANET is becoming a difficult task. This paper presents i...

The ability to predict transmission loss or field strength distribution is crucial for determining coverage in planning personal communication systems. Previous transmission loss prediction methods have considered specular reflection and diffraction of electromagnetic waves by and over buildings between the base station and the mobile terminals. These phenomena are of great importance in urban ...

Proliferation of indoor sensor infrastructure has created a new niche for mobile communications, yet research in indoor radio propagation still has not generated a definite model that is able to 1) precisely capture radio signatures in 3-D environments and 2) effectively apply to radios at a wide range of frequency bands. This paper first introduces the impact of wall obstructions on indoor rad...

Two main steps on the way to more realistic simulations of mobile ad-hoc networks are the introduction of realistic mobility and sophisticated radio wave propagation models. Both have strong impact on the performance of mobile ad-hoc networks, e.g. the performance of routing protocols changes with these models. In this paper we introduce a framework which combines realistic mobility and radio w...

We show that simple radio propagation and node mobility models widely used in MANET evaluation are not robust in indoor environments. Robust simulation models let researchers extrapolate simulation results and reach reliable conclusions about expected protocol performance. We experiment with two representative MANET routing protocols under different mobility and radio propagation models with de...

Two main steps on the way to more realistic simulations of mobile adhoc networks are the introduction of realistic mobility and sophisticated radio wave propagation models. Both have strong impact on the performance of mobile ad-hoc networks, e.g. the performance of routing protocols changes with these models. In this paper we introduce a framework which combines realistic mobility and radio wa...

Radio maps are a promising technology that can boost the capability of wireless networks by enhancing spectrum efficiency. Since spatial interpolation is critical challenge to construct precise radio map, latest works have proposed deep learning (DL)-based methods. However, DL model achieves enough estimation accuracy for practical uses has not yet been established due complexity propagation ch...

The propagation characteristics of radio wave have been an important topic in wireless communications. Based on the ray tracing method, the propagation of radio wave for indoor NLOS environment is simulated and analyzed. In this paper, the received power is obtained by simulation, and we will analyze the impact of various factors on the received power. Later, the study can be used to simplify i...