Items of № 7, 2017

The Electrosvyaz Magazine is one of the leading science & technical magazines in Russia.

CONCEPTUAL CRISIS IN THE ELECTROMAGNETIC SAFETY OF TELECOMMUNICATION NETWORKS AND SYSTEMS

M.Yu. Maslov, Samara Branch of Radio Research & Development Institute (FSUE Branch NIIR–SONIIR), head of the Scientific and educational center of technical electrodynamics and antenna systems, associate professor, Ph.D.; mikem@soniir.ru
Yu.M. Spodobaev, Samara Branch of Radio Research & Development Institute (FSUE Branch NIIR–SONIIR), chief researcher of the Scientific and educational center of technical electrodynamics and antenna systems, professor, Dr.Sci. (Tech.); spod@soniir.ru
M.Yu. Spodobaev, Radio Research & Development Institute (NIIR), first deputy general director, Ph.D.; mspd@niir.ru

The paper contains the analytical review of problems dealing with electromagnetic safety of population of the Russian Fedefation. Their scale, relevance and special significance for the national economy are shown. Medical-biological, organizational, social, methodological characteristics and reasons of the current conceptual crisis are considered on the example of radiating technical means of  telecommunications.
Keywords: telecommunication networks and systems, electromagnetic safety, medical-biological characteristics, social and methodological characteristics, concept of electromagnetic safety.


VISUALIZATION OF ELECTROMAGNETIC ENVIRONMENT NEAR ROOFTOP GSM PANEL ANTENNA SYSTEM

M.Yu. Zvezdina, Don State Technical University (DSTU), head of the radioelectronics department, Dr.Sci.(Phys.- Math.); zvezdina_m@mail.ru
Ju.A. Shokova, DSTU, department of the radioelectronics, associate professor, Ph.D.; zvezdina_m@mail.ru

It is shown that electromagnetic environment deterioration in residential areas caused by the increase in base stations density and impossibility of preventive activities for electromagnetic impact results in need of socially oriented monitoring. Visualization results for energy flux density on the rooftop obtained in simulation experiment for cellular panel antenna system are given. It is shown that the installation on the rooftop systems of six antennas RAO3-10GH-60 type or three antennas RAS-13X-120 type makes it impossible for common people to be safely located on it. Rooftop entrance without disconnecting the transmitter is only possible for professional maintenance.
Keywords: electromagnetic environment, GSM antenna system,visualization of energy flux density distribution.


APPROACH TO CHOICE OF ROUTE AND WAVELENGTH ASSIGNMENT IN TRANSPORT NETWORKS WITH WAVELENGTH DIVISION MULTIPLEXING ON THE BASE OF LEE PATH CONNECTION ALGORITHM

V.V. Efimov, JSC Scientific Research Institute “Rubin”, first deputy general director, associate professor, Ph.D.; v.efimov@rubin-spb.ru
S.A. Jasinskii, FSUE Branch ZNIIS–LO ZNIIS, scientific consultant, associate professor, Dr. Sci.(Tech.); yasinsky777@mail.ru
A.N. Gorbach, FSUE Branch ZNIIS–LO ZNIIS, head of the scientific and technical center, Ph.D.; ang@loniis.ru
A.N. Zyuzin, Military Academy of Communications named after Marshal of Soviet Union S.M.Budyonny, lecturer, Ph.D.; alexz01@bk.ru

Theoretical aspects of solving the problem of route selection and wavelength assignment (RWA) in transport WDM networks are considered. A new method based on the Lee path connection algorithm for solving this problem is proposed. This method allows simultaneously to search for and assign wavelengths. The model of WDM transport network in the form of discrete operating field is considered.
Keywords:
telecommunication system, transport network, wavelength division multiplexing, routing and wavelength assignment,RWA, Lee path connection algorithm.


RESEARCH OF IMAGE TRANSFER ON THE BASIS OF LоRа-TECHNOLOGY

R.V. Kirichek, The Bonch-Bruevich SPbSUT, department of telecommunication networks and data transmission, associate professor, Ph.D.; kirichek@sut.ru

The results of the study of multimedia data transfer parameters on the basis of LoRa technology are presented. The studies were conducted in the Internet of things laboratory of the SPbSUT. During the experiments different parameters of the functioning of the radio modules LoRa (spectrum spreading factor and bandwidth) were varied, that affect the time and quality of image transmission. JPEG and JPEG2000 methods of image compressing were used.
Keywords: LoRa, Internet of Things, Quality of Experience, image.


METHOD OF ESTIMATION AND MAINTENANCE OF CONNECTIVITY OF THE WIRELESS SENSOR NETWORK

 I.N. Nurilloev, The Bonch-Bruevich SPbSUT, department of telecommunication networks and data transmission, postgraduate student; ilhom_nurulloev@mail.ru
A.I. Paramonov, The Bonch-Bruevich SPbSUT, department of telecommunication networks and data transmission, professor, Dr.Sci.(Tech.); alex-in-spb@yandex.ru
A.E. Koucheryavy, The Bonch-Bruevich SPbSUT, head of telecommunication networks and data transmission department, professor, Dr.Sci.(Tech.); akouch@mail.ru

Connectivity is one of the most important indicators of wireless sensor network (WSN) functioning. The characteristics of connectivity are considered, the methods of estimation and maintenance of connectivity are proposed, and the analysis of its applicability to WSN is presented. Erdős–Rényi model was used to evaluate the connectivity of the network. The results of simulation were analyzed. The algorithm that provides the selection of positions of additional network nodes has been developed.
Keywords: ubiquitous sensor networks, connectivity, Erdős–Rényi model, unmanned aerial vehicle.


THE ACCURACY OF TRIGONOMETRIC INTERPOLATION OF FINITE-LENGTH DISCRETE-TIME PERIODIC SIGNALS

 S.V. Porshnev, Ural Federal University, head of the department of radio electronics information systems, professor, Dr.Sci.(Tech.); sergey_porshnev@mail.ru
D.V. Kusaykin, Ural Technical Institute of Communication and Computer Science, head of the research laboratory Systems, networks and telecommunications devices, Ph.D.; kusaykin@mail.ru

The results of the research on the accuracy of the periodic discrete-time signal reconstruction by means of trigonometric interpolation are presented. It is found that the dependence of mean square error of trigonometric interpolation on the number of signal samples is an additive mix of monotonously decreasing function of the number of samples and some periodic function of number of samples. It is shown that in defiance of classical estimates of a trigonometric interpolation error, existence of a periodic component leads to the fact that formal increase in number of samples can lead to reduction of reconstruction accuracy of continuous signal.
Keywords: trigonometric interpolation, reconstruction accuracy,Fourier series, discrete signal reconstruction, interpolation error,trigonometric polynomial.


NOISE-LIKE SIGNALS WITH PULSES OF QUASIHARMONIC FORM UNDER CONDITION OF SPECTRUM WIDTH LIMITATION

 I.V. Malygin, Ural Federal University (UrFU), Institute of Radioelectronics and Information Technologies (IRIT-RtF), department of communications equipment and technologies, associate professor, Ph.D.; pit_pit2@mail.ru
A.V. Komissarova, JSC Nau-Service, test engineer; a@komissarova.net
V.A. Korinchenko, UrFU, IRIT-RtF, department of automation, bachelor; korinchenkolera@gmail.com

In modern communication and navigation systems the method of direct spectrum spreading is widely used. This method assumes that before modulation the information sequence of bits is multiplied by a PN sequence.Classically, the PN sequence pulses are rectangular, so they are easiest to generate. However the signal spectrum width should be minimized, maintaining the benefits of spread spectrum signals. For this purpose we can move from rectangular pulses to quasi-harmonic pulses. At the same time when you change the pulse shape, it is necessary to maintain high correlation properties of PN sequence. The present study focuses on the changes of the autocorrelation functions of noise-like signals when quasi-harmonic pulses are used under the conditions of spectrum limitation.
Keywords: noise-like signals, M-sequence, correlation, Barker code, modulation, direct sequence.


RESEARCH OF AGING INFLUENCE ON FIRE DANGER PARAMETERS OF OPTICAL CABLES

I.A. Ovchinnikova, JSC VNIIKP, manager of telecommunication cable and wire division, Ph.D.; irovchinnikova@gmail.com
E.B. Vasiliev, JSC VNIIKP, deputy general director, Ph.D.; info@tdvniikp.ru
E.Ya. Gecha, JSC VNIIKP, chief research scientist, Dr.Sci.(Tech.); egecha@mtb91.ru
R.E. Vasiliev, CJSC Electroprovod, general director; rvasiliyev@tdvniikp.ru

The comparative test results before and after heat aging of the polymeric compositions applied in special fireproof optical cables constructions are presented. The test allows to imitate 40 years lifetime of optical cable and to evaluate the influence of aging on optical cables fire safety parameters. It is shown that properties of polymeric compositions and organic silicon rubber which were specially developed to increase fire safety do not deteriorate during long-term operation.
Keywords: optical cables, polymeric compositions, fire safety, aging, tests, characteristics, reliability.


PERFORMANCE ANALYSIS OF FDM-PON USING SUBCARRIER MULTIPLEXING

V.A.Vardanyan, SibSUTI, department of telecommunications and optical systems, associate professor, Ph.D.; vardgesvardanyan@mail.ru

A passive optical network using frequency division multiplexing is considered. Each subscriber of the network is provided with broadband subcarriers with duplex channels. In this network frequency-multiplexed channel signals of different modulations propagate in two directions over a single-mode optical fiber with optical demultiplexers, circulators and optical splitters at both ends. The dependences of the transmitters optimal powers on the number of subscriber terminals and channel modulation format are determined. Block schemes of central office transceivers and subscriber terminals have been developed.
Keywords: PON, FDM, SCM, DWDM.

 

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