Plenary Lecture

Analysis of the Improvement of the Systems' Performance for the Relay Transmission by the Application of the Diversity Combining Techniques

Professor Dragana Krstic
Faculty of Electronic Engineering
University of Nis

Abstract: The development of modern telecommunication systems leads to the consideration and study of their performance. Due to the propagation of digitally modulated useful signals through a wireless medium, there are often undesired effects, among which there is a change in the level of useful signal in time, called fading. Due to the expansion of communication services, there is a need for studying and analyzing of various factors that affect the quality of services. The study of the performance of wireless relay signal transmission in the presence of disturbances, as well as the possibility of improving some of the performance measures in the observed environment, is very important. An analysis of existing fading models and the application of the new, more general ones, in modeling these phenomena would faithfully represent all the complex characteristics of the transmission medium. General models within themselves include existing, well-known models, as special cases. Relay signal transmission through wireless communication channels is exposed to the influence of various types of interference, of which the most frequent are the emergence of fast fading, shadow effects and co-channel interference. The fast fading occurs due to the phenomenon of refraction, diffraction and scattering of the useful signal along the propagation path, so at the end of the link there are several copies of the desired signal, different amplitudes and phases, which interfere and generate the resulting signal, whose level changes over time. Co-channel interference is due to the fact that besides the desired signal on the carrier frequency, other signals are detected also.

Brief Biography of the Speaker: Dragana S. Krstic was born in Pirot, Serbia. She received the BSc, MSc and PhD degrees in electrical engineering from Department of Telecommunications, Faculty of Electronic Engineering, University of Nis, Serbia, in 1990, 1998 and 2006, respectively. Her field of interest includes telecommunications theory, optical, wireless, mobile and satellite communication systems. She works at the Faculty of Electronic Engineering in Nis since 1990. During this period she was engaged in teaching of a large number of courses. She participated in more projects which are supported by Serbian Ministry of Science and some international projects. She has written or co-authored about 260 papers, published in journals and at the international/ national conferences. She had about thirty Plenary and Keynote lectures, Panels and Tutorials by invitation at international conferences and some faculties . She has reviewed many articles in prominent journals such as: IEEE Transactions on Communications; IEEE Communications Letters; ETRI journal; C&EE Journal; Elektronika ir Elektrotechnika, Radioengineering, IEEE Access, and other well known journals. She is/ was reviewer of the papers for hundreds conferences and the member of technical program committees and international scientific committees of over 90 scientific conferences. Also, she is Associate Editor or member of Editorial Advisory Board/ Editorial Board of several journals: WSEAS Transactions on Communications, International Journal of Communications, Journal on Advances in Telecommunications, International Journal of Communications (IARAS). She is IARIA Fellow.

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