Information and Telecommunication Sciences最新文献

{"title":"ESTIMATION OF LOSSES IN JAMMERS COMPENSATION AT THE TRAINING SAMPLE FORMATION BY THE FREQUENCY METHOD","authors":"D. Piza, S. Romanenko, G. Moroz, D. Semenov","doi":"10.20535/2411-2976.22018.5-9","DOIUrl":"https://doi.org/10.20535/2411-2976.22018.5-9","url":null,"abstract":"Проблематика. При воздействии комбинированных помех эффективность функционирования радиолокационной станции существенно ухудшается. Это обусловлено декорреляцией активной шумовой помехи пассивной помехой, имеющей пространственно-распределенный спектр. Для уменьшения влияния пассивной помехи на процесс компенсации активной шумовой помехи необходимо тем или иным образом сформировать классифицированную обучающую выборку, порожденную только активной помехой, и оценить возможные потери, которые при этом возникают. Цель. Оценка потерь при адаптивной пространственной фильтрации активной составляющей комбинированной помехи при частотном методе формирования классифицированной обучающей выборки. Методы. Аналитический метод оценки потерь совместно с методом имитационного моделирования. Результаты. Выполнена оценка потерь в компенсации активной шумовой помехи, возникающих при различных значениях базы антенной системы и ширины спектра помехи, поступающей с различных угловых направлений. Оценены потери, обусловленные введением режекторных фильтров в цепи формирования весового коэффициента автокомпенсатора. Выводы. Научная новизна состоит в оценке потерь в компенсации активной шумовой помехи при пространственной фильтрации сигналов с использованием частотного метода формирования классифицированной обучающей выборки. Практическая значимость состоит в возможности выбора параметров системы помехозащиты при проектировании РЛС.","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133647685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TRANSMISSION AND RECEPTION OF UWB SIGNALS BASED ON ANTENNA DECODING","authors":"G. Avdeyenko, Sergey Bunin, T. Narytnik","doi":"10.20535/2411-2976.22018.27-35","DOIUrl":"https://doi.org/10.20535/2411-2976.22018.27-35","url":null,"abstract":"Проблематика. Предложена новая идея по передаче и приему сверхширокополосных сигналов импульсного радио с применением кодирования положения импульса (PPC) в передающей станции и декодировании с помощью антенны в приемной станции. Описана приемная станция, которая обеспечивает декодирование сверхширокополосного сигнала в виде PPC только с использованием приемной антенны, осуществляемого за счет пространственного согласования её конструкции с PPC адресным кодом отдельно взятого абонента. Цель исследований. Раскрыть идею передачи и приема сверхширокополосных сигналов на основе применения метода антенного декодирования PPC адресного кода отдельно взятого абонента. Методика реализации. Проведено компьютерное моделирования генератора сверхширокополосного сигнала импульсного радио с использованием САПР AWR Microwave Office. Для описания временных форм сверхширокополосного сигнала на выходе антенных диполей и в приемнике использован математический аппарат. Результаты исследований. Результаты компьютерного моделирования генератора сверхширокополосного сигнала импульсного радио на базе диода с накоплением заряда показывают возможность генерирования на его выходе сигнала с длительнотью менее 1 нс в полосе частот 0,3 – 2,5 ГГц и амплитудой, не превыщающей 0,3..0,45 В. Математическая модель и графики функций сверхширокополосного сигнала в виде PPC поясняют метод антенного декодирования PPC адресного кода отдельно взятого абонента в приемной станции. Выводы. Предложенная идея является концептуальной. Ее реализация дать возможность предложить новые технологические решения для создания беспроводных телекоммуникационных систем следующего поколения, в особенности в терагерцовом диапазоне.","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132577599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE PROGRAMMING LANGUAGE FOR EMBEDDED REAL-TIME DEVICES WITH REDUCING ERRORS AND WITHOUT REDUCING THE PERFORMANCE OF PROGRAMS","authors":"Oleksii Shmalko, P. Rehida, A. Volokyta, H. Loutskii, V. D. Thinh","doi":"10.20535/2411-2976.22018.44-53","DOIUrl":"https://doi.org/10.20535/2411-2976.22018.44-53","url":null,"abstract":"syntax tree The abstract syntax tree is defined in the Syntax module. This module contains the following types:  Module. It is a top-level object. Each file in the program is presented as a module. Each module consists of an import list and an ad list;","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122023335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SELECTION AND RECOGNITION OF THE SPECIFIED RADIO SIGNALS IN THE SW BAND","authors":"V. Bezruk, S. Ivanenko","doi":"10.20535/2411-2976.22018.21-26","DOIUrl":"https://doi.org/10.20535/2411-2976.22018.21-26","url":null,"abstract":"Проблематика. В настоящее время беспроводные радиотехнологии являются интенсивно развивающейся отраслью телекоммуникационной индустрии, что обуславливается их высокой популярностью вследствие удобства их использования для гражданского и специализированного применения. В настоящее время частотный ресурс уже достаточно перегружен, что приводит к проблемам электромагнитной совместимости. Решить эту проблему возможно путем эффективного использования частотного ресурса, для этих целей производится контроль за использованием радиочастотного ресурса путем автоматизированного радиомониторинга. Сейчас в эфире работает множество радиоэлектронных средств и их количество стремительно возрастает с каждым днём, что может привести к тому, что на обработку могут попасть не только известны радиосигналы, но и неизвестные сигналы, что в свою очередь может привести к ошибкам распознавания. В данной работе исследуются алгоритмы селекции и распознавания заданных радиосигналов, которые учитывают класс неизвестных сигналов. Цель исследований. Целью работы является исследование показазателей качества алгоритмов селекции и распознавания заданных радиосигналов при наличии неизвестных сигналов во время радиомониторинга в КВ диапазоне. Методика реализации. Исследование алгоритмов селекции и распознавания заданных радиосигналов при наличии неизвестных сигналов методом имитационного моделирования на выборках реальных сигналов. Результаты исследований. Получены значения показателей качества селекции и распознавания заданных радиосигналов при наличии неизвестных сигналов, которые есть приемлемыми для практики радиомониторинга. Предложенные алгоритмы распознавания должны повысить качество результатов радиомониторинга, и тем самым улучшить результаты проведения радимониторинга. Выводы. Предложеннные алгоритмы селекции и распознавания заданных радиосигналов при наличии неизвестных сигналов позволят повысить качество радиомониторинга в КВ диапазоне.","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122121555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THREE-TIER ARCHITECTURE FOR INTERNET OF THINGS NETWORKS","authors":"L. Globa, V. Kurdecha, Andrei Shoferivskyi","doi":"10.20535/2411-2976.22018.36-43","DOIUrl":"https://doi.org/10.20535/2411-2976.22018.36-43","url":null,"abstract":"Background. There is a large number of devices used on Industrial objects and all these devices should interact. Such usage of IoT in the corporate environment or in industrial facilities is called IIoT (Industrial IoT). According to statistical data of the information portal \"Statista\", there is a problem of a rapid increase in the number of devices nowadays. Therefore, it is necessary to create networks that can withstand all connected devices. The relevance of the paper is determined by the need to connect a large number of devices in a small area in the Industrial Internet of Things. Objective. The aim of the paper is to find the way to increase the number of IoT-devices per unit area through 3-lvl IoT architecture and the way to modify the interaction between IoT nodes. Methods. Analysis of publications devoted to the Internet architecture. Analysis of ways to increase the number of serviced nodes per unit area. On the basis of the analysis, a modification aimed at increasing the number of served IoT-nodes is proposed. Results. The three-level IoT architecture and an appropriate way of interaction between IoT devices are proposed. The circuit of three-tier architecture was developed and graphically displayed, the main feature of which is the existence of an additional node, which allows connecting a larger number of end devices. Algorithms and functions of the devices at all levels of three-tier architecture were described in detail. The model of the monitoring system and the advantages of its usage in the three-tier architecture are described. Also the effectiveness of the proposed method compared to the existing ones was mathematically proved. Conclusions. The three-level architecture of the IoT network has been developed, which is characterized by the availability of an additional level of the router, which allowed concentration of the group of end nodes in the router and unload the gateway. This allowed increasing the maximum number of terminal devices.","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"518 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123109680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COUPLING COEFFICIENTS OF DIFFERENT SPHERICAL DIELECTRIC MICRORESONATORS","authors":"A. Trubin","doi":"10.20535/2411-2976.12018.49-57","DOIUrl":"https://doi.org/10.20535/2411-2976.12018.49-57","url":null,"abstract":"Background. Nowadays, further increase of processing and transmission speed of information is associated with the development of hybrid integrated circuits, combining electrical and optical components. One of the important constituent parts of future optical integrated circuits are filters that can be conveniently implemented using so-called disc microresonators with whispering gallery oscillations. Technically, the problem of manufacturing such filters in the infrared and even in the visible wavelength range has been solved, but calculation of parameters and tuning of multilink filters is impossible without further development of the theory of their building. The development of such a theory is based on the electrodynamic modeling of processes that occur in complex systems of coupled microcavities, coupled with transmission line. At present, the study of filters that built on different microresonators hasn’t been carried out. Objective. The aim of the research is to construct the theory of electromagnetic wave scattering of the integral optical transmission lines on systems of coupled diversiform optical microresonators with whispering gallery modes, as well as development of mathematical models of filters constructed using various disk microresonators, and investigation of new structures of coupled microresonators with acceptable scattering characteristics. Methods. To construct a mathematical model of filters, an approximate solution of the Maxwell equations based on perturbation theory is used. The application of perturbation theory made it possible to find a solution to the problem of calculating the S-matrix of the filter in an analytical form. Results. An electrodynamic model for the scattering of optical transmission line waves by a system of coupled diversiform microresonators made of different dielectrics is developed. New structures of microresonators, realizing bandpass and bandstop filters, are investigated and their scattering characteristics are calculated. Conclusions. The theory of scattering of electromagnetic waves by systems of coupled diversiform optical microresonators is expanded. A new definition of the coupling coefficients of different microresonators is given. New filter models are constructed. Keywords: infrared range; integrated optics; optical filter; bandstop filter; bandpass filter; microresonator.","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123530097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PERFORMANCE-OPTIMAL PHASE-LOCKED SYSTEM FOR DEVICE OF SYNCHRONIZATION AND FORMATION OF THE EXACT TIME SIGNALS","authors":"D. Kalian","doi":"10.20535/2411-2976.12018.11-18","DOIUrl":"https://doi.org/10.20535/2411-2976.12018.11-18","url":null,"abstract":"Background. The generating reference time signals problem to meet the all consumers’ requirements for time and frequency information is targeted on researching the time scale IP-technologies transmission systems quality improvement and optimizing the synchronization devices self-tuning, as one of the most common systems’ elements in a today’s world. Objective. The aim of the paper is the phase locked loop (PLL) system performance optimization of the device for the exact time signal synchronization and formation. Methods. The linearized model construction of a closed automatic control system for a synchronization device, obtaining performance optimal control law in an analytical form and its implementation in the synchronization device PLL system using an adaptive digital phase discriminator. Results. The performance optimal control law in synchronization PLL device using an adaptive digital phase discriminator was practically implemented. Conclusions. The synchronization information transmission over existing IP networks based on the PTP protocol allows spreading the time scale with an accuracy of hundreds nanoseconds in real networks. Improving the exact time signals formation quality causes the optimizing performance need for the PLL synchronization devices. The adaptive digital phase discriminator use is protected by the Ukraine invention patent and provides the ability to control the phase discriminator (PD) characteristic shape for the transient process duration in PLL system. Keywords: standard; exact time; self-tuning; optimization; synchronization; control system; IP-technologies.","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121241679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COMPUTATION OF PROVIDING SERVICES INTEGRAL QUALITY INDEX","authors":"L. Globa, Ievgeniia Svetsynska, I. Volvach","doi":"10.20535/2411-2976.12018.34-42","DOIUrl":"https://doi.org/10.20535/2411-2976.12018.34-42","url":null,"abstract":"Background. The paper is devoted to review and improvement of existing algorithms for assessing the service provision quality by a telecom operator. Modern approaches to determining the level of service quality in the operator's telecom system require the use of complex mathematical methods and approaches that have significant computational complexity. The proposed approach to assessment of the provided services quality is based on a generalized quality function defined as the geometric average of the individual quality indicators of the operator's telecom monitoring system and allows the formation of fuzzy knowledge base in the form of the structured rules. To obtain the value of the integral indicator the rules of the fuzzy knowledge base are trained using the desirability function and the clustering method. The data set presentation to obtain from the operator's telecom monitoring system at certain time intervals in the form of the fuzzy knowledge base structured rules allows to reduce the making decision time on the service provision quality significantly, as well as to reduce the computational complexity of the service provision quality determining. Objective. Improving the service provision quality to the end user through \"soft\" condition control of the operator's system performance indicators and reducing computational complexity in determining their quality. Methods. The study was carried out based on a large number of literary sources analysis, the theory of fuzzy logic, clustering methods with using the generalized quality function, the theory of fuzzy knowledge base. Results. An approach is proposed to determining the integral quality indicator of the provided by the telecom operator to the end user services, obtaining the complex non-structured data estimation based on one integral fuzzy indicator and forming on its basis a knowledge system represented as the fuzzy knowledge base. When forming a fuzzy knowledge base, it takes time to learn its rules, but this is compensated by computational load reduction on the system during its operation. Conclusions. The presented research indicates the need to improve the modern telecom operator’s platform for the services provision that realized by an additional block of \"soft\" services quality management with the help of fuzzy knowledge base. This modification allows instead of processing Big Data from the telecom operator's monitoring system to determine the quality of services based on the rules of the fuzzy knowledge base. Keywords: Big Data; fuzzy knowledge base; fuzzy logic; service quality; integral quality index.","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124512964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MATHEMATICAL MODEL OF E-LEARNING TRANSACTION PROCESS","authors":"Serhiy Smatkov, N. Kuchuk","doi":"10.20535/2411-2976.12018.43-48","DOIUrl":"https://doi.org/10.20535/2411-2976.12018.43-48","url":null,"abstract":"","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125173709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MULTIPLE THREE-WAWE RESONANCES IN TWO-STREAM FREE-ELECTRON LASER WITH A HELICAL ELECTRON BEAM","authors":"A. Lysenko, I. Volk, A. Serozhko, O. Rybalko","doi":"10.20535/2411-2976.12018.58-64","DOIUrl":"https://doi.org/10.20535/2411-2976.12018.58-64","url":null,"abstract":"Background. A powerful terahertz radiation sources creation is one of the perspective tendencies in relativistic plasma electronics. Nowadays there are few devices able to create powerful radiation in millimeter-infrared waveband (even in the part of this band). Therefore, theoretical research of novel powerful terahertz radiation sources, that are also characterized by broad frequency spectrum, is an actual problem. Objective. The aim of the paper is a study of the influence of multiple three-wave resonant interactions in the klystron type two-stream superheterodyne free-electron laser (TSFEL) with helical electron beam on the forming effectiveness of the powerful waves with broad frequency spectrum. Methods. In order to theoretically analyze multiple resonances of wave harmonics, as initial, we use quasihydrodynamic equation, the continuity equation and Maxwell’s equations. We apply the hierarchic approach to the theory of oscillations and waves to the equations of motion and continuity, Maxwell’s equations are solved by means of the slowly varying amplitude method. As a result, we derive a system of differential equations for complex amplitudes of SCW electric field strength harmonics which we analyze by standard methods. Results. It was shown that in the two-stream superheterodyne FELs, utilizing the two-stream instability in helical electron beams as an additional electromagnetic wave amplification mechanism, the powerful multiharmonic space charge wave with broad frequency spectrum forms due to multiple resonant interactions. The spectrum width of such wave is larger compared to the spectrum width in TSFELs utilizing straight electron beams. It is also found out that amplification rates in such TSFELs are higher. Conclusions. An application of helical electron beams in multiharmonic TSFELs using multiple resonant interactions leads to the improvement of their amplification characteristics, frequency spectrum widening in multiharmonic signal generation mode, and to overall geometric dimensions decreasing compared to TSFELs utilizing straight beams.","PeriodicalId":410541,"journal":{"name":"Information and Telecommunication Sciences","volume":"9 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133112218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}