Items of № 2, 2016

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

COMMUNICATION SYSTEMS ON TRANSPORT: DEVELOPMENT TENDENCIES AND REGULATION TASKS

V.N. Vasilyev, ITMO University, rector, corresponding member of the Russian Academy of Sciences, professor, Dr.Sci. (Tech.); vasilev@mail.ifmo.ru
V.A. Grigoriev, JSC Laboratory of Infocommunication Networks, director, ITMO University, head of wireless telecommunications department, professor, Dr.Sci.(Tech.); vgrig@rdnet.ru
I.A. Khvorov, JSC Laboratory of Infocommunication Networks, associate director, ITMO University, wireless telecommunications department, associate professor, Ph.D.; khvorov@labics.ru
Y.A. Raspayev, JSC Telecom-project, associate director, ITMO University, wireless telecommunications department, associate professor, Ph.D.; raspaev@telecom-project.ru

Tasks of support with communication of technological processes of traffic safety are always solved in transport branch. Recently requirements to the volume of services on transport grow (services for passengers, transport logistics of loads, an individual transport and so forth). These problems can’t be satisfied within traditional technological communication systems because the separate network shall be selected for service of users. In this paper tendencies of development of communication networks in transport branch are considered. The conclusion is drawn on need of development of the uniform technical and technological policy providing interaction of separate segments of networks and networks of different transport systems with each other.
Keywords: transport communication, ITS, CALM, radio communication heterogeneous networks, LTE, VHF radio communication, DMR, TETRA, «Tsitran».


ARCHITECTURE OF THE TELECOMMUNICATION NETWORK FOR TRANSPORT SYSTEMS

V.A. Grigoriev, JSC Laboratory of Infocommunication Networks, director, ITMO University, head of wireless telecommunications department, professor, Dr.Sci.(Tech.); vgrig@rdnet.ru
I.A. Khvorov, JSC Laboratory of Infocommunication Networks, associate director, ITMO University, wireless telecommunications department, associate professor, Ph.D.; khvorov@labics.ru
Y.A. Raspayev, JSC Telecom-project, associate director ,  ITMO University, wireless telecommunications department, associate professor, Ph.D.; raspaev@telecom-project.ru

In this paper approach to formation of architecture of a telecommunication network for transport branch taking into account need of the solution of tasks of technological and commercial customers is considered. It is offered to take architecture of CALM as a basis and to consider national experience of creation of a communication network public.
Keywords: ITS, CALM, network architecture.


THE FEATURES OF NETWORK TRAFFIC FLOWS IN THE BACKBONE INTERNET CHANNEL RESEARCH

S.V. Porshnev, Ural Federal University (UrFU), Head of department, Dr.Sci. (Tech.), professor; sergey_porshnev@mail.ru
D.A. Bozhalkin, UrFU, post-graduate student; bozhalkin@mail.ru
A.S. Koposov, UrFU, post-graduate student; alexkopas@gmail.com

The results of the analysis of a high-speed backbone network traffic dumps are analyzed. Estimates of the functions’ parameters that approximate the distribution of number of packets transmitted in the backbone internet channel for three groups of users are obtained. The effect of the aggregation window size on the distribution parameters is observed. It was found that one of the parameters of the distribution doesn’t have the property of scale invariance, which allows to put into question the validity of the hypothesis of self-similarity of traffic in the backbone Internet channel.
Keywords: network, dump, network packet, traffic flows, classification of flows, data mining, data processing, parallel computing, distribution parameters, genetic algorithms.


INTERSYSTEM-EMC ENHANCEMENT TECHNIQUE FOR 4th —GENERATION MOBILE COMMUNICATION SYSTEMS

O.A. Shorin, МTUCI, professor, Dr.Sci.(Tech.); oshorin@gmail.com
G.O. Bokk, LLC NSTT, director of science, Dr.Sci.(Tech.); bokkg@yandex.ru
S.V. Sukhatsky, NRTB Co.; deputy director of experimental research dept.; suhatskiy@nrtb.ru

The paper deals with the electromagnetic compatibility between the 4th-generation LTE (FDD, TDD) systems and McWill system. It has been determined that intermodulation products constitute the main source of out-of-band emission. Several options are proposed to ensure the electromagnetic compatibility of 4th-generation networks. Some band-filtering techniques are proposed that make it possible to reduce the guard band between LTE systems down to 1,4 MHz Taking into account certain specific feature of the McWill technology, we have considered various combinations of electromagnetic influence on system’s elements and ways to suppress the interference impact by applying a spatial diversity and by adjusting the directional antenna pattern. It has been shown that the co-existence of the systems should be possible with a guard band of 2,5 MHz and corresponding conditions have been identified. Enhancement of systems’ noise immunity has been calculated for the case where the space-time processing of signals has been implemented in base-station antenna systems used in the McWill network and has made it possible to suppress directional interferences from other networks in a unique way.
Keywords: еlectromagnetic compatibility, McWill System, noise immunity of the network, space-time processing.


DESIGN OF TRANSMITTING AND RECEIVING RADIO-RELAY SYSTEMS’ RADIOPATHS OF TERAHERTZ

M.E. Ilchenko, National Technical University of Ukraine «KPI», vice-president for research, National Academy of Sciences of Ukraine, academician; Ilch@kpi.ua
T.N. Narytnіk, SP «Institute of Electronics and Communication UANNP», director, Ukrainian Academy of Sciences, academician, Ph.D.; director@mitris.com
V.N. Radzikhovsky, National Technical University of Ukraine «KPI», senior researcher, Ph.D.; icbr@i.ua
S.E. Kuzmin, National Technical University of Ukraine «KPI», researcher; icbr@i.ua
A.V. Lutchak, National Technical University of Ukraine «KPI», postgraduate; Alex_obolon@mail.ru

The results of the design and experimental studies of receiving and transmitting paths telecommunication systems with Gigabit bandwidth in the frequency range 130-134 GHz, comprising: frequency converters with subharmonic pumped, the local oscillator that uses highly stable sets crystal oscillator, the band passing septum-filter in the waveguide channel 1,6 х0,8 mm, conical horn antenna. First, in practical terms, the study laboratory sample digital simplexe relay systems terahertz band communication range under normal conditions within 1 km when the possible values of bit errors BER of no more than 10-6V comprising: receiving and transmitting redetect in the frequency range 130-134 GHz and digital modem with a channel bandwidth of up to 1200 MBit/s.
Keywords: functional design, terahertz dіapazon, receiving and transmitting radio path, digital modem, bandwidth, radio relay systems, quality indicators


THE QUESTIONS OF LEGAL SUPPORT ORGANIZATION BACKHAUL NETWORK CONNECTION TO SMALL CELL MOBILE NETWORK OF UMTS AND LTE (Part 2)

O.L. Smirnov, JSC “IAS”, Chairman of the Bord of Directors, MAI, professor of department 609, Dr.Sci.(Tech.); smirnov@iasnet.ru
Y.A. Kerzhentcev, OJSC “Intellect Telecom”, deputy director of strategic development; kerzhencev@i-tc.ru
S.N. Padalko, MAI, director of department 609, professor, Dr.Sci.(Tech.); snp@inmas.ru

This article discusses the condition and characteristics of the domestic regulatory framework governing the creation and use of backhaul network to connect to the core of small cell networks of mobile radiotelephone communication standards UMTS and LTE in terms of assessing the adequacy of the PPA and the complexity of their performance with the expected mass introduction of small cell.
Keywords: normative legal acts (NLA), network, mobile communication, Long Term Evolution (LTE), вackhaul network, base station (BS) of the local coverage, home BS, small cell, femtocells, picocells, microcells and metrocells.


THE PROBABILITY OF ERROR FOR OPTIMAL CODES IN A MULTIDIMENSIONAL GAUSSIAN CHANNEL AND THEIR ESSENTIAL CHARACTERISTICS

M.A. Bykhovskiy, MTUCI, professor, Dr.Sci.(Tech.); bykhmark@gmail.com

The method of estimating the probability of erroneous reception Rosh complex multidimensional signals belonging to the class of volume-spherical codes. The method allows to calculate the Rosh using simpler formulas. Diagrams of dependencies of the Rosh from the dimension of the signal space (normalized duration of the transmitted signals), in which the optimal ensemble of signals used to transmit messages. Discusses issues related to the practical choice of signals parameters that have a significant impact on the noise immunity of the reception. The analysis of the main characteristics of message systems with optimum signals. The results of the analysis can be used in the design of communication systems.
Keywords: bandwidth of a communication channel, the method of calculating the probability of error when receiving from a multidimensional ensemble of finite duration.


SIMULATION OF INTERPOLATION ALGORITHMS USING FOR DETERMINING OF RADIO SIGNAL’S PARAMETERS FOR EMBEDDED CONTROL SYSTEMS

O.R. Nikitin, Vladimir State University named after A.G. and N.G. Stoletovs (VISU), head of  Department “Radio engineering and radio systems”, professor, Dr.Sci.(Tech.); olnikinin@vlsu.ru
A.D. Pozdnyakov, VISU, Department “Radio engineering and radio systems”, professor, Dr.Sci.(Tech.); 11alexpozd@mail.ru
A.A. Rufov, VISU, Department “Radio engineering and radio systems”, assistant; a.a.rufov@list.ru

Discusses computational algorithms for estimating the parameters of continuous, amplitude-modulated and amplitude-shift keyed signal in the time domain by a limited sample of the instantaneous values using windowing interpolation and smoothing by the Kotelnikov’s number. The analysis of the factors influencing errors, and the conditions appropriate use of sinx/x functions in problems of digital signal processing. Using mathematical simulation of the developed algorithms and created in Delphi interactive programs defined methodical error for different windows: rectangular, Hann, Natell, Blackman. Results presented in the form of graphs and tables. Recommendations on the application of the proposed algorithms.

Keywords: harmonic signal, methodic error, window functions, RMS value.


THE POTENTIAL EFFICIENCY OF THE AMPLIFIERS OF COMPLEX COMPOSITE SIGNALS

A.V. Smirnov, MTUCI, Department of radio equipment and circuitry, postgraduate student; sandrew2k@yandex.ru
S.F. Gorgadze, MTUCI, Department of radio equipment and circuitry, professor, Dr.Sci.(Tech.); svetlana-gorgadze@yandex.ru

Based on the idealized model of a nonlinear amplifier the resulting estimates of it’s potential average efficiency in the amplification of a typical complex composite signal as in the adaptation of the output voltage from the amp to the level of low-frequency amplitude envelope of the RF signal, and in it’s absence. Investigated the problem of exchange between energy efficiency and linearity of amplification when using the advanced digital correction signal.
Keywords: power amplifier efficiency, amplitude-modulated signal, AM-AM non-linearity, nonlinear distortion, digital pre-distortion, transistor operating regime, envelope tracking, class of amplification.


COMPARATIVE ANALYSIS OF ANALOGUE TV BROADCASTING SWITCH-OFF MODELS

N. Krasnoselskiy, Radio Research & Development Institute (FGUP NIIR), chief of laboratory, Ph.D.; inkras@mail.ru
Yu. D. Shavdiya, FGUP NIIR, chief of department; y_shavdiya@mail.ru

It is shown that the transition from analogue to digital terrestrial television broadcasting and between different profiles (stages) of digital broadcasting are of a multivariate nature. It is shown the most likely strategies of transitions to more complex profiles of digital broadcasting. The analysis of factors inherent in the period of mixed analogue and digital broadcasting is submitted. Statistical data on image resolution, compression standards, and spectral efficiency, taking place in broadcasting of digital multiplexes in several European countries are systematized.
Keywords: digital terrestrial television broadcasting, transition to digital broadcasting, digital broadcasting coverage, data compression standard, spectrum efficiency, data transmission rate, multiplex.


THE BRIDGE RESONANT DC/DC-CONVERTER WITH AN ADDITIONAL TRANSFORMER

B.A. Glebov, MPEI, docent, Ph.D.; glebovba@mail.ru
V.A. Zhigachev, MPEI, postgraduate; usual.one@gmail.com

This article describes the modified circuitry of H-bridge resonant DC/DC-converter with a phase-shift regulation of power transistors. The main characteristics of the topology and a method of calculating the parameters of resonant LC-circuit are given.
Keywords: bridge resonant converter, phase shift control, ZVS.

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