Deterministic propagation prediction methods proposed for indoor radio are useful for estimating the average propagation loss in real environments, which usually have complicated geometries. On the other hand, these methods generally fail to accommodate human body shadowing, which is a significant propagation effect in indoor picocells. Several empirical models to describe body shadowing have b...

In wireless network design and positioning it is essential to use radio propagation models for the applied frequency and environment. There are many propagation models available for both indoor and outdoor environments; however, they are not applicable for 433 MHz ISM frequency, which is perfectly suitable for smart metering and sensor networking applications. During our work, we gathered the m...

Detecting wireless network intruders is challenging since logical addressing information may be spoofed and the attacker may be located anywhere within radio range. Accurate indoor geolocation provides a method by which the physical location of rogue wireless devices may be pinpointed whilst providing an additional option for location-based access control. Existing methods for geolocation using...

The radio holography methodology may be applied in the scientific programs for future small satellite that will use radio signals emitted by radio navigation, radio communication satellites for precise measuring effects of radio waves propagation at low elevation angles and for global monitoring of radio communication channels passed through the atmosphere and ionosphere. Another task consists ...

We proposed a novel ray-tracing based radio waves propagation (RTRWP) Law suitable for under-tunnel complex coal mine workface. The energy consumption model evaluation in complex coal mine workface is derived. Theoretical analysis about calculating the multiple reflections of the radio waves in coal mine workface is also provided. Computer simulations and field tests in workface tunnels show th...

We proposed a ray-tracing (RT) acceleration method using the tensor completion technique for three-dimensional (3D) radio map. Internet of things (IoT) has become widespread recently, and analysis indoor wave propagation important in optimizing installation location IoT devices. Generally, RT is used analysis. However, time-consuming to simulate. The simulation time required even larger when ca...

Atmospheric radio ducts can trap VHF/UHF radio waves and propagate them over long distances. 284.4625 MHz Japanese radio wave signal measurements show that the radio waves are propagated to Korea coastal regions when ground temperatures exceed 10◦C. This paper discusses the reasons for the existence of this critical temperature threshold. key words: radio duct, duct propagation, critical temper...

Indoor environment can be characterized as sever attenuating and depolarizing medium for electromagnetic (radio) waves propagation. These signals are radiated from transmitters to space (free-space propagation channel) and received from space to receivers through antennas. These signals are commonly radiated or received with pre-defined signal’s polarization schemes and these schemes are always...

Received signal strength (RSS) ranging is not suitable in indoor environment due to complicated multipath signal propagation, leading to inaccurate distance estimation. This paper shows the experiments which collect RSSI signals in indoor environment for analysis. The objective of these experiments is to discover possible solution to reducing indoor lognormal shadowing effect. Two assumptions w...