Journal of Telecommunications and Information Technology (JTIT) 2/2017 Print E-mail
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2_2017

This edition of the Journal of Telecommunications and Information Technology – as many previous ones – cannot be considered dedicated to one subject in the wide field of telecommunications. However, there are a range of articles devoted to one and very important aspect, which is a quality. Quality in telecommunications could be understood in different ways. One aspect is the quality of the network described by various parameters such as bandwidth or packet delay. The other consideration of quality concerns the services perceived by user. Unfortunately, many of them do not see the relation between network quality and perceived quality of service. Therefore, this topic is often discussed in articles. Each type of network as well as type of service requires a different approach from the quality perspective. Of course, the papers on quality concern only selected, specific aspects. Other articles in this edition are not directly related to quality of telecommunications networks and services. There are papers devoted to sensor networks, radar and LTE technologies, transmission in open space, power supply systems, VoIP, and application of telecommunication devices in other domains.

The first article, written by Marcus Rompf and Tadeus Uhl, is entitled The New Metric and the New Software Tool for determining QoS in the Short Messages Service in Mobile Networks. It is dedicated to the quality of the SMS service. The new metric is a combination of two methods, namely: completion rate of SMS and E2E delivery time.

The second paper, Modeling of Quality of Experience in No-Reference Model by Jakub Nawała, Lucjan Janowski and Mikołaj Leszczuk, presents work on measuring the quality of video services. The authors indicate that not only the QoE quality measurement is important for operators, but also information about source errors. The paper describes a system based on calculating numerous different no-reference visual metrics.

The next paper, The Microwave Sources for EPR Spectroscopy, written by Mariusz Hruszowiec, Kacper Nowak, Bogusław Szlachetko, Michał Grzelczak,Wojciech Czarczyński, Edward F. Pliński and Tadeusz Więckowski, is not strongly related to telecommunications. It shows how microwave devices used in telecommunications can be used for cheap, quick and accurate material investigation.

The fourth article, Quality Aspects in Digital Broadcasting and Webcasting Systems: Bitrate versus Loudness, written by Przemysław Gilski, Sławomir Gajewski and Jacek Stefański, is dedicated to quality in digital broadcasting and webcasting systems. The authors pay special attention to coding efficiency of popular audio formats in the context of storing. They perform an objective and subjective study of the perceived quality of real-time radio programmes.

The next paper, entitled Performance Comparison of Homogeneous and Heterogeneous 3D Wireless Sensor Networks, has been written by Ranjana Thalore, Partha Pratim Bhattacharya and Manish Kumar Jha. It is devoted to wireless sensor networks, where limited battery energy and efficient data delivery are considered to be major constraints for development. The authors try to solve this problem.

In the paper Self-organized Clustering for Improved Interference Mitigation in White Spaces, Julio Ar´auz and Alberto S´anchez propose a collaborative coexistence mechanism for white space base stations in the case where these base stations operate in geographical areas where only one TV channel is left for broadband access.

The paper Sharing Spectrum UE LTE and Air-Traffic Control Radars in 800 MHz Band by Valery Tikhvinskiy, Grigory Bochechka, Pavel Korchagin, Shakhmaran Seilov and Andrey Gryazev presents problems related to using the 800 MHz band by LTE. This frequency band is used not only by the terrestrial mobile services but also by air traffic control radars (ATRC). Mutual interferences are possible in areas where LTE and ATRC use the 800 MHz band. The authors propose protection criteria for receivers of ATRC from LTE-800 networks.

Another paper, Battery Available Capacity Meter Built into an AC/DC Telecom Power Supply System, is devoted to AC/DC telecommunications power supply systems. Paweł Godlewski, Ryszard Kobus and Paweł Kliś describe the results of testing one of them that is integrated with the energy and voltage measurements module.

Despite the current widespread use of VoIP, the voice packets delivered over the Internet are not protected. Asma Jebrane, Naˆıma Meddah, Ahmed Toumanari and Mohamed Bousseta propose a new secure authentication key agreement scheme. The scheme and the results of a security analysis are presented in the paper entitled A New Efficient Authenticated and Key Agreement Scheme for SIP Using Digital Signature Algorithm on Elliptic Curves.

Free space optical communication has many advantages, but unfortunately it is very sensitive to weather conditions. The next paper, Mitigation of Scintillation Effects in WDM FSO System using Multibeam Technique by Marvi Grover, Preeti Singh and Pardeep Kaur, aims at reducing the effect of turbulent atmospheric conditions like the scintillation effect on the free space optical system.

Developing and building a small-size, high-performance antenna for ultra-wideband applications is a difficult task. The design of such an antenna and an analysis of its parameters is shown in the paper A New CPW-fed Patch Antenna for UWB Applications, written by Purnima Sharma, Santosh Kumar Jha and Partha Pratim Bhattacharya.

As you can see, dear readers, the papers represent different, sometimes very diverse areas of telecommunications. I hope the articles will inspire you in your research.

Sławomir Kula

Guest Editor



mnisw-logo_enImprovement of language quality; Assigning DOIs; Subscription to the plagiarism detection system – tasks financed under 556/P-DUN/2017 agreement from the budget of the Ministry of Science and Higher Education under the science dissemination fund.

 

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