Кафедри

Зараз показуємо 1 - 3 з 3

Model of impact interferences on radiocommunication systems for special communications
(NTU "KhPI", 2017) Romanenko, Igor; Shyshatskyi, Andrii
As the analysis of recent events in the East of Ukraine shows, radio communication is the transport basis for the construction of telecommunication networks of special purpose. In view of the above, the subject of study in the article are the special radio communication systems, operating in a complex electronic environment. The purpose of this articleis to develop a mathematical model for the effects of interference on systems of special radio communication. The taskssolved in the course of the study: a formal description of various types of noise that is used to suppress the systems of special radio communication; analytical representation of the probability of a bit error for signals with different types of modulation under the influence of the main types of deliberate disturbances; development of recommendations for increasing the noise immunity of special radio communication systems with different types of signal modulation under the influence of deliberate interference. In the course of the study, the following method swere used: signal theory, radiocommunication theory and the theory of potential impedance protection. In the course of the study, analytical dependencies were obtained that allow us to calculate the probability of a bit error in the effect of intentional interruptions for different types of signal modulation. Conclusions: the proposed mathematical model should be used in the analytical modeling and evaluation of the performance of broadband radio networks of a special purpose taking into account the combined action of the additive white Gaussian noise and structural impediment, algorithms for the formation and processing of signals at the physical level, as well as the properties of the radio channel.
Methods of previous coding, that uses in systems of radio special purpose with Massive-MIMO technology
(НТУ "ХПІ", 2018) Romanenko, Igor; Shyshatskyi, Andrii; Kuvshinov, Olexiy; Pikul, Rostislav
Modern radiocommunication systems of special purpose function in the conditions of shortage of radio resources and active radio-electronic suppression. One of the ways to increase noise immunity, bandwidth and capacity of communication networks is using antenna arrays, namely, Massive-MIMO technology. However, the possibilities of this technology are not used in full. In order to increase the efficiency of the using of Massive-MIMO technology, the authors of this article are considered methods of pre-coding. The analysis is intended to decompose existing methods of pre-coding for the further development of highly effective algorithms of pre-coding. In the above scientific work, the authors of the article uses the basic provisions of the theory of communication, the theory of signals, the theory of noise immunity, as well as the theory of antennas. According to the results of the research, the authors draw the following conclusions: the matrices of the previous coding, which have the same right singular vectors, which are the optimal for all criteria; the main difference between the previous coding algorithms, that can be obtained by various synthesis criteria is the different distribution of the radiated power between the spatial rays. Thus, the analysis showed, that thanks to the identical structure of the work of linear pre-coders, it is possible to carry out a dynamic change on the transmission side of the type of the linear pre-coder, thereby adaptively modifying the characteristics of the transmission and transmission path, while remaining within the framework of practically one structure of the communication channel.
Analysis of modern condition of military radiocommunication system
(НТУ "ХПІ", 2017) Romanenko, Igor; Shyshatskyi, Andrii
Aim of the article is to conduct an analysis of military communications systems that were used in the area of conducting antiterrorist operation in the Donetsk and Lugansk regions. The article analyzes the modern facilities of military communication, namely: military radiocommunication systems, military satellite communication systems, military systems of radio relay and tropospheric communication. The advantages and disadvantages of each type of communication are considered, the causes of their occurrence were considered, and the ways of solving these reasons in the future were substantiated. An analysis of the main technical characteristics of military communication systems, opportunities, advantages and disadvantages has been conducted. The perspectives for the development of military communication systems have been determined on the basis of the analysis of the military facilities of communication used in the article, which are used in the region of the antiterrorist operation in the Donetsk and Lugansk regions. To eliminate the problematic issues mentioned in the article, the authors of the article are proposing to launch their own military satellite for the needs of the Armed Forces of Ukraine; To develop new models of military communication; To conduct deep modernization of the existing radio stations, command-staff cars, radio relay and tropospheric stations; To integrate telecommunications equipment adopted in the last years into a single information space of the Armed Forces of Ukraine, as well as to reach agreement with representatives of leading telecommunication equipment manufacturers regarding the transfer of technologies and deployment of production in the territory of Ukraine.

Кафедри

Переглянути

Фільтри

Налаштування

Сортувати за

Результатів на сторінку

Результати пошуку