Radio signal propagation modeling plays an important role in designing wireless communication systems. Different models have been developed to predict radio propagation behavior for wireless communication systems in different operating environments. In this paper we limited the discussion to the latest achievements in radio propagation modeling, related to tunnels. The main modeling approaches used for propagation in tunnels are reviewed, namely, numerical methods for solving Maxwell equations, waveguide or modal approach, ray tracing based methods and twoslope path loss modeling. They are discussed in terms of modeling complexity and required information on the environment including tunnel geometry and electric as well as magnetic properties of walls. The article was published in the highest ranked international journal in the area of telecommunications.
COBISS.SI-ID: 27108391
In the article we summed several years of research and development in the area of broadband communications via high altitude platforms (HAPs) with the emphasys on the role of HAPs in the provision of global wireless connectivity. In the paper we evaluated the suitability of several advanced communication technologies for their use on HAPS, including cognitive radio and dynamic spectrum access, and provided challenges and directions for future research work. The article is one in the series of invited articles published upon a centenial year of publication of prestigeous journal "Proceedings of the IEEE" in the broader field of electrical engineering (first quartile, 2/245) with an impact factor significantly above the average.
COBISS.SI-ID: 25035303
The scientific monograph issued at a prominent international publisher Wiley provides state of the art overview in highaltitude platform (HAP) enabling technologies, addressing recent research activities and results. It explores the enabling technologies and economics of HAPbased communication systems, including issues related to aeronautics, applications and business modelling, as well as future trends in broadband service provisioning. Furthermore, it discusses broadband wireless communications from HAPs, the operating environment, advanced communication techniques for efficient radio link resource management, including cognitive radio and dynamic spectrum access, and the use of free space optical communication.
COBISS.SI-ID: 23992615
In this article, we propose an end-to-end service composition for information transport based on principles from Service Oriented Architecture (SOA). SOA principles are similar to those behind the division of labour, therefore should incentivise providers to adopt them to make better use of resources and increase the revenue. As we show, some SOA concepts are similar to concepts in Open Systems Interconnection (OSI) reference model, with the key advantages of dynamism and flexibility. We discuss Service Oriented Networks (SON) based on transport service composition across access and core segments and describe an access network selection for online gaming. It is knowledge modelling and representation along with machine learning and decision making methods that form the core of the cognitive system concept, in this article demonstrated on the case of cognitive network. The article was published in renowned international journal from the first quartile (6/76) and has been so far cited several times.
COBISS.SI-ID: 22803495
In the paper we survey the existing research on cognitive networks, related and enabling techniques and technologies. We provide our position with respect to the cognitive networking concept with the emphasis on suitability of various artificial intelligence techniques for its development. We map identified techniques to the corresponding states of the cognition loop, compare architectural proposals that comply with the requirements for a cognitive network, discuss their relative merits and identify some future research challenges. The article was published in renowned international journal with an impact factor above average and it was ranked among the 10 most cited articles in this journal in the past 5-year period.
COBISS.SI-ID: 22595367