Moskalets M. Methods of space-time access in advanced mobile communication systems

The object is the process of providing reliable and high-quality access in mobile communication systems under conditions of high load and complex signal-interference situation. The goal is to increase the efficiency of multiple access by time and probabilistic indicators in perspective mobile communication systems based on the development of system scientific and technical solutions for the implementation of adaptive space-time access methods. Methods of research are synthesis and analysis of mathematical models and methods of active use of frequency-time and space-polarization parameters of signals; the theory and methods of adaptive antenna arrays and adaptive space-time and space-polarization signal processing; the telecommunication theory; the theory of optimization; the theory and methods of determining the directions of arrival of signals; the theory of random processes, assessment and management; methods of radio physics and electrodynamics; the probability theory and mathematical statistics; methods of simulation modeling. The results – methodology of scientific and technical solutions for the introduction of space-time multiple access methods with adaptive signal processing in a complex signal-to-interference situation in selected frequency bands in mobile communication systems when providing the appropriate quality of service delivery has been proposed for the first time; For the first time, in order to increase the productivity of space-time access in mobile communication systems, unlike existing access methods using multi-beam antenna arrays, the use of methods based on the theory of adaptive antenna arrays has been proposed; For the first time, for advanced mobile systems, a method is proposed to reduce the procedure for detecting subscriber station call request signals using the model of optimal reception of signals from transmissions; For the first time in the problems of space-time access in mobile communication systems for estimating the vector of weight coefficients of an antenna array, it is proposed to use recursive methods of processing in the space of state variables; Further development has been given to the methods for analysis and consideration of the implementation limitations in the synthesis of access procedures caused by the uncertainty of the initial data on the signal-to-interference situation, the presence of mutual influence between the antenna elements, multipathing, and the loss of spatial coherence of signals; Further development has been given to the method of estimating the arrivals of subscriber stations signals on the basis of algorithms of resolution and superresolution; For the first time, the method of planning the spatial placement of femto and microwave cellular networks of the mobile network based on the optimization theory of packaging of 2 and 3 dimensional objects has been proposed; For the first time, the method of complex use of space-time and probabilistic competitive access. Implementation – in the educational process of the Department of Infocommunication Engineering in Kharkiv National University of Radio Electronics, particularly in disciplines «Systems of Mobile Communication», «Perspective Wireless Systems»; in research works: scientific research work № 235-1 (ДР №0109U000662) «Methods of Designing NGN Telecommunication Networks and Managing Their Resources»; scientific research work № 261-1 (ДР №0111U002627) «Methods for increasing the performance of next-generation wireless networks»; scientific research work № 13-12 (ДР № 0113U006180) «Investigation of Factors of Influence on Results of Measurements of REM Emission Parameters and Development of Proposals for Determination of General Errors and Uncertainties during Measurements by Means of Radio Control»; scientific research works ДР №0114U000007т and ДР №0116U000066т. The field of implementation is telecommunication systems and networks.