MAIN NOMA SCHEMES CLASSIFICATION
M.G. Bakulin, Moscow Technical University of Communications and Informatics (MTUCI), associate professor, Ph.D.; m.g.bakulin@gmail.com
T.B.K. Ben Rejeb, MTUCI, dean of a faculty, Ph.D.; benrejebt@yandex.ru
V.B. Kreyndelin, MTUCI, head of a department, professor, Dr.Sci.(Tech.); vitkrend@gmail.com
D.Yu. Pankratov, MTUCI, associate professor, Ph.D.; dpankr@mail.ru
A.E. Smirnov, MTUCI, associate professor, Ph.D.; smirnov.al.ed@gmail.com
The purpose of this article is to classify various types of non-orthogonal multiple access schemes (NOMA) proposed for use in 5G and 6G wireless communication systems. A general approach to NOMA systems classification is suggested, which allows for a deeper analysis of NOMA systems characteristics, as well as the development of the theory of NOMA systems to optimize and further improve them.
Keywords: 5G, 6G, NOMA, multiple access, non-orthogonal division, code division multiple access, power domain multiple access, multiuser detection.
NETWORK CODING OF NON-BINARY SIGNAL-CODE SEQUENCES IN DATA TRANSMISSION
S.S. Vladimirov, The Bonch-Bruevich Saint-Petersburg State University of Telecommunications, department of communication networks and data transmission, associate professor, Ph.D.; vladimirov.opds@gmail.com
An approach to the formation of non-binary signal-code sequences based on ternary Galois fields and differential phase modulation is presented. Methods are developed and formulas are derived that determine the procedure for physical network coding of the presented signal-code structures. Recommendations are given on the choice of error-correcting coding methods for their joint use with the proposed signal-code sequences.
Keywords: network coding, signal-code sequences, Galois fields, differential modulation.
ALGORITHM OF BROADBAND SIGNAL DETECTION UNDER CONDITIONS OF DISPERSION DISTORTIONS WITH SIMULTANEOUS EVALUATION OF MULTIPLE PARAMETERS
V.I. Lipatkin, Moscow Technical University of Communication and Informatics (MTUCI), Research Institute, junior researcher; lipatkin.24@gmail.com
E.O. Lobova, MTUCI, Research Institute, senior researcher, Ph.D.; lizabeth2@mail.ru
The paper proposes a mathematical algorithm for joint detection of a signal distorted by the frequency dispersion of an ionospheric channel and estimation of its four unknown parameters, namely: the slope of the dispersion characteristic, frequency shift, delay, and initial phase. Also, the paper analyzes the impact on the quality of the detector’s operation of the presence or absence of the process of estimating dispersion distortions and their consideration when calculating the detection threshold.
Keywords: frequency dispersion, broadband signal, distortions, joint detection and estimation, maximum likelihood estimation.
PROBLEMS OF IDENTIFICATION OF TERMINAL DEVICES OF NARROW-BAND WIRELESS NETWORKS OF THE INTERNET OF THINGS AND WAYS TO SOLVE THEM
P.I. Antonovich, FSBI NIIR, director of the Internet of Things Research Center (IoTRC), associate professor, Dr.Sci.(Mil.); p.antonovich@niir.ru
A.A. Zaharov, FSBI NIIR, deputy director general, associate professor, Ph.D.; a.zaharov@niir.ru
A.M. Puzanov, FSBI NIIR, deputy director of the IoTRC, associate professor, Ph.D.(Mil.); puzanov@niir.ru
I.E. Pereverzev, FSBI NIIR, lead software engineer of the IoTRC, Ph.D.; pereverzev@niir.ru
The article clarifies some terms related to terminal devices of the Internet of Things communication networks. Their typification, classification and evaluation of modern approaches to identification are carried out. Some problems of identification of terminal devices of wireless networks of the Internet of Things are considered and ways to solve them are proposed.
Keywords: Internet of Things, IoT, indicator, terminal device, sensor, actuator, Internet of Things communication networks, identifier.
METHODS FOR ROUTING INFORMATION IN SATELLITE COMMUNICATION NETWORKS BASED ON NON-GEOSTATIONARY SPACECRAFTS
I.N. Panteleimonov, FSBI NIIR, head of laboratory; panteleimonov@niir.ru
A.A. Zaharov, FSBI NIIR, deputy director general, associate professor, Ph.D.; a.zaharov@niir.ru
M.M. Stupnitsky, FSBI NIIR, scientific secretary, associate professor, Ph.D.; smm@niir.ru
In order to solve the problems of ensuring information exchange with a spacecraft in real time, it is proposed to create a space system consisting of repeater satellites interconnected by satellite communications. In such a space system, the problem of routing information flows arises. The routing methods existing in computer networks do not take into account the specifics of space systems in which the spacecrafts in the network understanding are routers that are in constant motion at cosmic velocity. Various methods for solving routing problems in space communication systems are proposed for different options of communication organization.
Keywords: spacecraft, repeater satellite, orbital grouping, on-board router, Earth station, inter-satellite communication line.
ANALYSIS OF LOCATION UNCERTAINTY BY TRIANGULATION IN THE PROCESS OF SPECTRUM MONITORING
V.V. Kogan, NIIDAR, leading researcher, Ph.D.
A.P. Pavlyuk, JSC IRCOS, consultant, Ph.D.; pavlyukap@mail.ru
The article gives the derivation of formulas for calculating the instrumental (i.e. the minimum possible) uncertainty of location in the process of triangulation during spectrum monitoring. The uncertainty of the location depends entirely on the instrumental uncertainties of the direction finders involved in the triangulation process. The limitations used in the analysis are indicated. Information on the practical application of the analysis results is given.
Keywords: spectrum monitoring, direction finding, location determination, direction finding uncertainty, location uncertainty.
INTEGRATION OF DATA MINING METHODS DURING INFORMATION AND ANALYTICAL WORK
A.V. Pankov, A.F. Mozhaisky’s Military Space Academy, senior lecturer, associate professor, Ph.D.(Mil.); yvdspb55@yandex.ru
S.A. Bagretsov, A.F. Mozhaisky’s Military Space Academy, Scientific Research Center, senior researcher, professor, Dr.Sci.(Tech.); sergeibagrecov@bk.ru
O.S. Lauta, Admiral S.O. Makarov State University of Marine and Inland Shipping, professor, Dr.Sci.(Tech.); laos-82@yandex.ru
N.A. Vasiliev, S.M. Budyonny’s Military Academy of Communications, applicant; vasn2020@mail.ru
The article presents a conceptual approach to improving the processes of information and analytical work in solving problems of recognizing the state of partially observed control objects. The basis of the proposed approach is formed by the method of aggregating the results of non-precision recognition of the states of objects using several identification methods. The results of the experiment on evaluating the quality of an information solution by combining the results obtained using machine learning methods are presented.
Keywords: : identification of object states, neural networks, fuzzy logic, probabilistic analysis, complex processing, modeling.
GRAPHICAL METHOD FOR DETERMINING THE AREA OF PERMISSIBLE EFFICIENCY OF A RADIAL-RING TYPICAL STRUCTURE
S.A. Jasinskii, S.M. Budyonny’s Military Academy of Communications, leading researcher, professor, Dr.Sci.(Tech.); yasinsky777@mail.ru
A.N. Zyuzin, S.M. Budyonny’s Military Academy of Communications, teacher, Ph.D.; alexz01@bk.ru
The article presents refined mathematical expressions for determining the area of permissible efficiency of a radial-ring typical structure based on the average harmonic and average difference values of the relative efficiency coefficients of their structural components. A graphical method is proposed for determining the area of permissible efficiency within the calculated lower and upper boundaries of the implemented communication nodes of a telecommunications network.
Keywords: radial-ring typical structure, area of permissible efficiency, average harmonic, average difference.
ECONOMIC ASPECTS OF THE USE OF SINGLE-MODE FIBER OPTIC TECHNOLOGY IN THE INFORMATION SYSTEM OF THE DATA CENTER’S COMPUTER ROOM
A.L. Zubilevich, Moscow Technical University of Communications and Informatics (MTUCI), associate professor, Ph.D.; zal51@rambler.ru
A.B. Semenov, Moscow State University of Civil Engineering (MGSU), professor, Dr.Sci.(Tech.); andre52.55@mail.ru
S.A. Sidnev, MTUCI, associate professor, Ph.D.; sidnev100@yandex.ru
V.A. Tsarenko, MTUCI, postgraduate; vtsarenko@mail.ru
The problem of choosing the type of fiber-optic element base for building the channel and physical levels of the information infrastructure of the data center’s computer room, taking into account its modernization in the course of day-to-day operation, is considered. The expediency of choosing the NPV economic efficiency indicator as the main criterion for decision-making is shown. The adequacy of the proposed model is enhanced by taking into account the uncertainty factor in the Hurwitz indicator. Analytical expressions and calculation results are presented.
Keywords: structured cabling system, data center, fiber-optic cable, NPV method, uncertainty.