DO WE REALLY NEED TERM «RADIOMONITORING» IN RUSSIAN OR IT IS BETTER TO CONTINUE TO USE GOOD OLD CONTROLE DU SPECTRE?
А.N. Kiselev, FSUE GRFC, leading expert; an. firstname.lastname@example.org
А.P. Pavlyuk, ITU, senior expert, Ph.D.; email@example.com
S.Yu. Pastukh, FSUE NIIR, EMC analysis centre, deputy director, Ph.D.; firstname.lastname@example.org
The complex of terminological problems in the field of radio frequency spectrum monitoring is considered in relation to the national legal and regulatory documentation as well as in respect of translation into Russian materials of the International Telecommunication Union, carried out by this organization. It is shown that the existing terminology used successfully in Russia almost since the invention of the radio allows to efficiently describe all the various aspects of the spectrum management at the current stage of the technological development as well. This gives reason to conclude that the introduction of a new term taken from English language is not only useless but even harmful. At the same time, it is necessary to somewhat streamline the terminology database in accordance with the current regulations.
Keywords: terms and definitions, radio-frequency spectrum management, radio monitoring of radio-frequency spectrum use, inspection of activities in the field of communication, the Federal Law «On Communications», the International Telecommunication Union, Radio Regulations.
PROBLEMS OF TERMINOLOGY IN EDUCATION ELECTRODYNAMICS SUBJECTS
E.R. Milyutin, The Bonch-Bruevich Saint-Petersburg State University of Telecommunication (SPbSUT), department «Radio systems and signal processing», professor, Dr.Sci. (Tech.), professor; email@example.com.
T.P. Kazantseva, The Bonch-Bruevich SPbSUT, department «Radio systems and signal processing», associate professor, Ph.D.; firstname.lastname@example.org
A.V. Kosarev, The Bonch-Bruevich SPbSUT, department «Radio systems and signal rocessing», associate professor, Ph.D.; email@example.com
The authors consider the terminology used in the curriculum electrodynamic disciplines of the students enrolled in the specialty «radio engineering» and related contact fields.
Keywords: electrodynamics, terminology, education.
MODELLING OF SAR SIGNAL DISTORTIONS GIVEN THE HETEROGENEITY OF THE ATMOSPHERE
Instability of atmosphere parameters and atmospheric inhomogeneities lying in the path of the reflected signal from earth surface to aircraft is one of the destabilizing effects, that can significantly deform SAR image. In this paper we examined the influence of the atmospheric instabilities on the characteristics of reflected signal from earth surface. A special mathematic tool, offered by the authors, combines the methods of geometrical optics and statistical radio physics. It allows to evaluate the errors introduced by the atmosphere and the meteorological formations parameters of the signal received by the radar apparatures. This report describes perspective ways to increase the performance of simulation apparatuses based on SIMD processor architectures and methods of parallel digital signal processing, on the GPU (CUDA and OpenCL).
Keywords: atmospheric inhomogeneities, autofocus, SAR, HIL test bench, reflected signal, parallel computations.
MULTIPOLARIZATION DIVISION RADIOSYSTEMS
Eu.L. Pustovoitov, FSUE NIIR, senior staff scientist, MTUCI, chair «EMC and radiofrequency spectrum management», associate professor, Ph.D.; firstname.lastname@example.org
To increase efficiency of radiofrequency spectrum existing radiosystems use one carrier frequency for simultaneous transmission a pair of radiosignals with orthogonal polarizations. The goal of this article is to investigate the possibility of increasing efficiency of radiofrequency spectrum use more than twice by means of usage of several nonortogonal polarizations. Method to determine such possibility for any given set of polarizations has elaborated as well as the structure of the system and procedure of determination parameters of the radiosignals polarization division arrangement on the receiving side. Examples of decisions are given for some cases when multipolarization division is possible.
Keywords: radiosystems, multipolarization division, frequency spectrum use efficiency, mutual interferences.
DEVELOPMENT OF METHODS TO MAINTAIN THE FUNCTIONALITY OF WIRELESS SENSOR NETWORKS UNDER INTENTIONAL ELECTROMAGNETIC INTERFERENCE CONDITIONS
L.Tr. Hoang, The Bonch-Bruevich SPbSUT, postgraduate student; email@example.com
R.V. Kirichek, The Bonch-Bruevich SPbSUT, deputy department chief, Ph.D.; firstname.lastname@example.org
A.I. Paramonov, The Bonch-Bruevich SPbSUT, professor, Dr.Sci.(Tech.); email@example.com
A.E. Koucheryavy, The Bonch-Bruevich SPbSUT, head of department, Dr.Sci.(Tech.); firstname.lastname@example.org
This paper presents the impact of intentional electromagnetic interference on the functioning of wireless sensor networks. As a result of such influence, there is degradation of channel quality among nodes, leading to destruction, distortion and blocking of the transmitted information. Consequently, this results in disruption of connection among nodes and disruption of the network structure due to failure of nodes. The methods for increasing the probability of network operation using adaptive routing based on parameter quality of service and using supernode, which allow multiple reserves for coordinator/gateway of wireless sensor network. The obtained results can be used for solving the tasks of increasing the probability of data delivery in wireless sensor networks under intentional electromagnetic interference conditions.
Keywords: wireless sensor networks, intentional electromagnetic interference, routing, sensor node, supernode, algorithm, connection, model.
DIGITAL FREQUENCY SYNTHESIZERS FOR COMMUNICATION SYSTEMS
I.V. Ryabov, Volga State University of Technology, professor, Dr. Sci. (Tech.); email@example.com
A.A. Lebedeva, Volga State University of Technology, undergraduate; firstname.lastname@example.org
E.S. Kluzhev, Volga State University of Technology, undergraduate; email@example.com
The new structure of the direct digital synthesizer of frequency modulated signals for modern adaptive communication systems with pseudorandom operation frequency tuning is considered. The proposed direct digital synthesizer has the increased speed and the possibility of the operating control of initial frequency. The new structure of the high speed digital frequency synthesizer, which allows to generate a complex frequency modulated signal that can be used in modern communication systems, is suggested.
Keywords: digital frequency synthesizers, frequency-modulated signal, multi-frequency telegraphy.
COMPARATIVE COST INDICATORS OF THE SUBSCRIBER’S CONNECTION FOR TERRESTRIAL AND SATELLITE BROADBAND TECHNOLOGIES
V.R. Anpilogov, JSC VSAT-TEL, deputy general director, associate professor, Ph.D.; firstname.lastname@example.org
The article presents the analysis of several national programs for the development of broadband. It is shown that the main problems of the digital divide associated with the connection for the «last» 5−10% of households. The estimation of the cost of connection households using terrestrial technologies (FTTP, xDSL, 4G) and satellite technologies of the second and the third generation HTS, including hybrid satellites Express AMU1, Express AM5 and Express AM6 with a payload of HTS. It is shown that the use of satellite technology HTS gives a much high technical and economic parameters for the implementation of universal service tasks than using terrestrial technologies.
Keywords: broadband, HTS satellites, household connection.
ENERGY CHARACTERISTICS ANALYSIS OF PROMISING SYSTEM OF SATELLITE BROADBAND ACCESS FOR AIRBORNE USERS
N.A. Vazhenin, Moscow Aviation Institute (MAI), associate professor, Ph.D.; N. Vazhenin@mai.ru
A.S. Volkovskiy, MAI, associate professor, Ph.D.; a. email@example.com
V.O. Kazachkov, MAI, associate professor, Ph. D.; firstname.lastname@example.org
А.V. Nesterov, JSC Moscow Radiocommunication Research Institute, general director; email@example.com
F.B. Serkin, MAI, assistant; firstname.lastname@example.org
The main features of the satellite broadband access systems for airborne users are considered. In relation to promising Russian airborne station of satellite broadband access in the Ka-band, working with the Russian high throughput satellites, the methods and results of study of the energy potential and the signal-to-noise ratio, which determines the attainable information rate in a forward link, using DVB-S2X standard, are presented.
Keywords: satellite communications, broadband access, airborne users, high throughput satellite, radio link energy potential, signalto-noise ratio.
TRAFFIC PERFORMANCE ANALYSIS FOR MULTISERVICE NETWORK WITH ADAPTIVE ROUTING IN THE PRESENCE OF REPEATED CALLS
Multiservice telecommunication network is studied under adaptive (dynamic) routing in accordance with LLR method and network performance is analyzed at the level of virtual connection establishment. The mathematical model was constructed to approximately evaluate the blocking probability for arriving calls. This model takes into account the possibility of repeated attempts when a call was blocked because of insufficient channel resources for available routes. On the basis of presented model the computational algorithm is proposed to calculate probabilistic measures characterizing grade of service for analyzed network with multiple traffic classes. The relevancy of considered analytical model and sufficient accuracy of approximation scheme are tested by numerical results obtained with the help of discrete event simulation.
Keywords: multi-service network, adaptive routing, call blocking probability, repeated calls, calculation algorithm.
ASSESSMENT OF DIGITAL SPEECH TRANSMISSION QUALITY WITH THE FINITE SPEECH SIGNAL SAMPLE
V.V. Savchenko, Nizhniy Novgorod State Linguistic University, professor, Dr.Sci.(Tech.); email@example.com
Research subject is the assessment of the digital speech transmission quality. These objectives are achieved by using the novel theoretical-information assessment of speech transmission quality with the criterion of a minimum of the transmitted speech signal redundancy. We experimentally studied the proposed criterion to compare the quality of telephone communication by using two different mobile phones, namely, the latest (2015) and outdate (2012) models. It is shown that speech transmission quality with the 2015-year model phone is 23% higher when compared with the outdate model.
Keywords: speech communication, speech transmission, communication systems, digital signal processing, speech signal, speech coder, voice coder.
SIMULATION OF ATTENUATION IN RADIOCHANNEL WITH MOBILE COMMUNICATION POINT ON A ROUGH TERRAIN
A.V. Arkhipkin, CJSC SBT, chief designer; andrey. firstname.lastname@example.org
V.M. Gavrilov, Vladimir State University, professor, Ph.D.; valerian. email@example.com
R.N. Glukhov, CJSC SBT, design engineer; firstname.lastname@example.org
V.K. Dementiev, Vladimir State University, assistant lecturer; email@example.com
D.S. Smirnov, FSUE SSPE Krona, radiotechnical department, engineer; firstname.lastname@example.org
The results of computer simulation of attenuation in the radiochannel with the mobile point of contact on a rough terrain were presented. The selection of the receiver sensitivity sufficient for reliable radio communication on three-kilometer track was evaluated.
Keywords: simulation of attenuation, rough terrain, mobile communication point, fixed communication point.
THE APPLICATION OF VIRTUAL PAIRS FOR BROADBAND DSL ACCESS. RECATEGORIZATION OF NETWORK FOR POTS CONSTRUCTED CABLES WITH LF QUADS (METHOD SCEPANOVIC)
V. Scepanovic, master telecommunication ETF, KABLSISTEM, (Belgrad, Republic of Serbien); kbs. email@example.com
This article proposes the way to use the existing POTS with LF group core cables with star-quads for broadband DSL transport. Analyzing parameters that limit broadband DSL access, the author suggests the application of virtual pairs (method Scepanovic) as a new approach. New methodology would allow the implementation of 50% of pairs in existing networks and loops for voice services to be used as a medium for broadband DSL access. The application of virtual pairs in uncertain economic times can trace the path for Telco providers for a quick and efficient return on investment using the existing VF cable infrastructure with star-quads construction.
Keywords: Electromagnetic bridge (EM bridge), NEXTSt (FEXTSt), A5x4, PSNEXTA5x4, PSFEXTA5x4, PSNEXTE, PSFEXTE, PSNEXTD, PSFEXTD, Signal-to-Noise Ratio (SNR), Power Sum Attenuation Crosstalk Ratio (PSACR), Virtual pairs.