Items of № 5, 2014

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

SYNTHESIS OF RECURRENT FILTERS OF THE MOVING WINDOW IN BASES OF VILENKIN-KRESTENSON FUNCTIONS

V.P. Volchkov, Moscow Technical University of Communications and Informatics, professor, Dr.Sci.(Tech.); volchkovvalery@mail.ru,
A.M. Shloma, Moscow Technical University of Communications and Informatics, professor, Dr.Sci.(Tech.); alremizov@yandex.ru

The synthesis of digital recurrent m-filters of the moving window of anyone dynamical oder concerted with basis of Vilenkin-Krestenson functions is presented. A proposed filter is multi-channel, i.e. it provided to be accommodate to recurrent processing not only scalar, but also vectorial signals. The results are demonstrated that this filters have the efficient computing realization and too well approximate the desired amplitude-frequency performance.
Keywords: digital m-filter, recurrent filter, infinite-impulse response filter, signal filtering, vectorial signals, image processing, Vilenkin-Krestenson functions, m- correlation matrix.


 

FPGA IMPLEMENTATION OF MULTIPATH HIGH-SPEED MOBILE COMMUNICATION CHANNEL SIMULATOR

A.B.Gerasimov, P.G. Demidov Yaroslavl State University, department of radio systems, assistant, Ph.D; gerasimov@uniyar.ac.ru
D.M.Solovyev, P.G. Demidov Yaroslavl State University, department of radio systems, graduate student; soldm89@gmail.com

This article presents the implementation of multipath aeronautical communication channel simulator. Statistical and deterministic mathematical channel models are introduced; single block diagram of implementation of both models with FPGA is descried. It is shown that produced design accurately simulates multipath channel characteristics.
Keywords: multipath channel, radio channel simulator, field-programmable gate array, Clarke model, deterministic model, radiophysical scene.


 

WIDEBAND SHF PLL FREQUENCY SYNTHESIZERS WITH OPTIMAL CONTROL

L.N. Kazakov, P.G.Demidov Yaroslavl State University, department of radio systems, head of the department; Dr.Sci.(Tech.), kazakov@uniyar.ac.ru
D.Y. Vishnyakov, P.G.Demidov Yaroslavl State University, department of radio systems, assistant; vishnyakovdenisu@yandex.ru

In this paper result of one loop wideband SHF PLL frequency synthesizers implementation with low phase noise of output signal and high speed frequency tuning was offered. The obtained characteristics were achieved by the use of special methods: Wiener filter in the steady state and optimal control of loop filter in transient behaviour. To achieve maximum effect switch charge pump generator, overloading element of loop filter and nonlinear low-pass filter was applied.
Key words: PLL frequency synthesizer, phase noise, structural and parametric synthesis, optimal control.


 

QUALITY OF SERVICE PARAMETER ESTIMATION OF PACKET SWITCHED TRANSPORT NETWORK BASED ON HIDDEN MARKOV MODEL

V.I. Kozachok, The Academy of Federal Security Guard Service of the Russian Federation, professor, Dr.Sci. (Soc.); kosachok@mail.ru
V.A. Baranov, The Academy of Federal Security Guard Service of the Russian Federation, docent, Dr.Sci. (Tech.); Baranov.va@mail.ru
O.V. Kriukov, The Academy of Federal Security Guard Service of the Russian Federation, docent, Ph.D.; oleghooker@gmail.com
D.I. Kriventcev, military unit 95306; kriventsevdi@gmail.com

The Article presents an analysis of the statistical characteristics of quality indicators of the transport packet switched network. To solve the problem of estimation of the transport packet switched network a hidden Markov model using wavelet- transformation is proposed.
Keywords: transport packet switched network, estimation, QoS, hidden Markov model, wavelet- transformation.


 

NOISE CHARACTERISTICS OF HARMONIC OSCILLATIONS RC OSCILLATORS

V. N. Кuleshov, National Research University «Moscow Power Engineering Institute», professor, Dr.Sci.(Tech.); vnk37@mail.ru
T.I. Boldyreva, National Research University «Moscow Power Engineering Institute», заведующая кафедрой, Ph.D.; boldyrevati@yandex.ru
E. M. Drozdova, National Research University «Moscow Power Engineering Institute», student; drozdovaem1989@mail.ru

PM and AM noise of two types of RC-oscillators consisting of differential amplifier and common-collector stages, with different feedback circuits (inverting and non-inverting) are investigated using abbreviated equations method, developed by S.I.Evtjanov. The accurate and abbreviated symbolic equations of the RC-oscillators with internal sources of additive noise are derived. The steady-state operation equations are obtained and stability constraints are defined. The differential equations that define connection between internal noise currents and phase and amplitude fluctuations were derived. Simple formulae for these oscillators PM and AM noise calculation are obtained. Power spectral densities of PM and AM noise were calculated taking into consideration both thermal noise of feedback loop and all other sources of wideband noise. It is shown that contribution of the active devices noise is small enough to ignore it for approximate evaluation of PM noise. Results of these two oscillators PM and AM noise comparison are presented. These results can be used to solve the problem of RC oscillators circuits choice taking into consideration their noise properties.
Keywords: RC-oscillators, phase noise, oscillator parameters, Wien bridge, three-series RC filter, power spectral densities.


 

FLUCTUATIONS IN THE QUADRATURE RING OSCILLATORS WITH PLANIMETRIC CHAINS INTERSTAGE COUPLING

V.N. Kuleshov, National Research University “Moscow Power Engineering Institute”, professor , Dr.Sci.(Tech.); vnk37@mail.ru
D.V. Kochemasov, National Research University “Moscow Power Engineering Institute”, postgraduate; KochemasovDV@gmail.com

Results of investigation of internal wideband noise influence on quadrature oscillator (QO) using single tank resonators in ring structure performance are presented. Simple formulae for power spectral densities (PSD) of phase and amplitude fluctuations are derived using slowly varying amplitude approach. In addition to these results the formulae for output oscillations phase difference and relative amplitude difference are derived. These PSD are necessary to estimate internal noise influence on the QO performance. An example of quantitative analysis of the phase and amplitude fluctuations in the particular QO model is presented.
Keywords: ring oscillator, quadrature fluctuations, fluctuations of the phase, amplitude, phase difference and the difference of the oscillation amplitudes, the spectral power density.


 

DISTORTION COMPENSATION FOR QAM SIGNAL WITH ADDITIVE BACKGROUND NOISE

N.E. Poborchaya, National Research University “Moscow Power Engineering Institute”, docent, Ph.D; n.poborchaya@mail.ru

The article analyzes the distortion compensation methods for QAM signal with additive background noise. Two distortion compensation algorithms (regularization and nonlinear filtering) were compared for different models of phase noise and observation noise. For both algorithms accuracy of observation and symbol error probability were estimated. Simulation shows that synthesized algorithms are resistant to the deviation of the noise distribution law from Gaussian. Regularization algorithm exceeds the nonlinear filtering for estimation accuracy of the unknown signal parameters and gives 5-6 dB energy efficiency gain for information symbols detection. Simulation was performed on a test sequence of length m=500.
Keywords: estimation, sample, nonlinear filtering, regularization algorithm, modified least squares method (LSM), distortion compensation, non Gaussian noise.


 

AN APPLICABILITY ANALYSIS OF RISKS ESTIMATION METHODS TO AUTHENTICATION FOR REMOTE ELECTRONIC INTERACTION

A.G. Sabanov, Aladdin R.D., Deputy CEO, Bauman University (BMSTU), associate professor , Ph.D.; asabanov@mail.ru

The methods of risks analysis to authentication for remote electronic interaction are analyzed. The applicability of currently in use methods of risks analysis to authentication functionality performing is analyzed. The applicability of more than half of methods of risks analysis to authentication for remote electronic interaction is shown.
Keywords: method, authentication, information security, risk analysis, remote electronic interaction.


 

THE ADAPTIVE OPTIMUM INTELLECTUAL MODEM FOR DIGITAL TELEPHONY SYSTEM

V.G. Sannikov, National Research University “Moscow Power Engineering Institute”, professor, Ph.D; tes_mtuci@mail.ru

On the basis of mathematical model of a low-frequency equivalent of a telephone channel of connection problems of synthesis and the analysis of the optimum coherent modem in system of a digital telephony are investigated. Finite signals in a time of the transmitting modem, optimum by criterion of a maximization of a signal/noise ratio on an entry of the receiving modem, not calling an intersymbol interference are synthesised by consecutive transmission of the discrete messages. In the conditions of a nonstationary communication channel and the correlated noise of supervisions on the basis of minimization of empirical risk in the form of Tikhonov‘s functional, the problem of an optimum recurrent estimation of a frequency limit of the channel, used is solved at synthesis of optimum signals in the transmitting modem and synthesis of the matched filter in the receiving modem. Rated and experimental dependences of a lapse of an estimation on a signal/noise ratio and a sample size of casual supervisions are resulted. Outcomes of work can be used at designing of modern adaptive intellectual modems with the boosted effectiveness.
Keywords: system of a digital telephony, the intellectual modem, optimum finite signals, a recurrent estimation of parameters, adaptation.

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