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SCIENTIFIC WORK

SCIENTIFIC AND TECHNICAL JOURNAL «RADIO COMMUNICATION THEORY AND EQUIPMENT» ISSUE 2, 2009

MODERN METHODS OF FREQUENCY-EFFICIENT CODED MODULATION. PART II. COMPARATIVE ANALYSIS OF MODELING RESULTS

Yu.B. Nechaev, principal research engineer
Ŕ.Ŕ. Malyutin, head of Scientific and Technical Department, e-mail: malyutin@nm.ru
JSC “Concern “Sozvezdie”

Acquired by modeling, noise immunity characteristics of coded modulation methods discussed in Part I are presented. Basing on modeling results, comparison of coded modulation schemes in comparable conditions with equal computational expenses that realize their procedure is carried out.

Key words: coded modulation, turbo codes, iterative reception algorithms, trellis coding modulation, multilevel modulation.


METHODS FOR EVALUATING THE MULTIPATH CHANNEL PARAMETERS USING ITERATIVE RECEPTION ALGORITHMS

Yu.B. Nechaev, principal research engineer
A.A. Malutin, head of Scientific and Technical Department, e-mail: malutin@nm.ru
JSC “Concern “Sozvezdie”

The specificity of multipath-channel pulse response evaluation conditioned by the usage of iterative reception algorithms is discussed. Taken into account the latter one, the modification for a series of known evaluation methods is offered and their characteristics comparison is carried out, inclusive computation expenses for realization. A series of simplified algorithms for channel pulse response and noise dispersion evaluation is offered which are tailored for iterative processing algorithms.

Key words: iterative reception algorithms, minimum square error evaluation, evaluation algorithm, multipath channel.


EVALUATING THE RADIO WAVE FREQUENCY EFFECT ON ITS PROPAGATION DISTANCE TAKING INTO ACCOUNT THE LAY OF LAND

S.V. Makarov, design engineer, tel.: 8-9507681719
A.V. Chernyshov, head of sector, tel.: 8-9518697744
E.V. Priymenko, design engineer, tel.: 8-9507500075
JSC “Concern “Sozvezdie”

Radio wave weakening and radio interval reliability dependence during UHF and SHF waves propagation, taking into account the lay of land is evaluated and described.

Key words: radio relay communication, radio wave weakening, radio wave propagation ellipsoid, radio vision area, taking into account lay of land.


ABOUT VIRUS PROPAGATION IN MOBILE NETWORKS

I.O. Tolstykh, head of sector, tel.: (4732) 52-21-24
M.V. Akhromeev, design engineer, tel.: (4732) 52-21-24
M.Yu. Sukhorukov, head of direction, tel.: (4732) 52-18-80
JSC “Concern “Sozvezdie”

Peculiarities of mobile telephone virus propagation in the networks with clustering and various-level cluster overlapping are discussed.

Key words: virus-type information impact, potentially dangerous unitary code, unauthorized access, network clustering.


SQUARE ARGUMENT SINE INTEGRALS

N.E. Korotkov, leading research engineer, JSC “Concern “Sozvezdie”, tel.: (4732) 52-25-60

The formulae for square argument sine integrals as referred to the complex and real domain are presented. The necessary and sufficient convergence conditions are given for the corresponding improper integrals.

Key words: complex and real domains, antiderivatives, definite and improper integrals, probability integral, convergence conditions.


EVALUATION OF ELECTROMAGNETIC OF RADAR MEANS COMPATIBILITY WITH SUPERBROADBAND SIGNALS AND NARROWBAND SIGNALS OPERATING IN COMMON FREQUENCY BANDS

Ě.Ĺ. Zhilina, research engineer, FSRDTC EW PDEE, tel.: 8-8601076382
V.I. Ledovskaya, senior research engineer, JSC “Concern “Sozvezdie”, e-mail: valiavanna@mail.ru
V.N. Ledovskoy, leading research engineer, FSRDTC EW PDEE, e-mail: vicknick@mail.ru
V.P. Pustovit, Direction deputy chief, FSRDTC EW PDEE, e-mail: vpetzp@yandex.ru

Interference peculiarities originating from superbroadband radar (SBS) effect upon similar means from traditional radars upon SBS radars and SBS radar interference upon traditional means with narrowband signals are discussed. The correlations and estimation of the radar quantity compatible with different signal types in common frequencies are acquired.

Key words: EMC, superbroadband signal, interference protection radars.


BROADBAND SIGNAL SEARCH ALGORITHM UNDER INTERFERENCE COMPLEX EFFECT CONDITIONS

V.V. Mayorov, design engineer, JSC “Concern “Sozvezdie”, e-mail: vitmay@msn.com

Optimized one-stage cyclic algorithm for broadband signal search under conditions of Gaussian noise, structure and pulse interference is offered. This algorithm provides the decreasing of false detection probability.

Key words: broadband signal, search algorithm, structure and pulse interference, ambiguity function.


COMPARATIVE ANALYSIS OF DIFFERENT DATA ACCESS CONTROL PRINCIPLES AND THEIR APPLICATION IN DISTRIBUTED INFORMATION PROCESSING SYSTEMS

S.D. Buslov, head of sector, e-mail: serj_aist@mail.ru
O.I. Nesterova, leading engineer, e-mail: oinv@mail.ru
JSC “Concern “Sozvezdie”

Comparative analysis of different data access control principles in information systems is given. Possibility of representing both Mandatory privilege access principle and discretionary privilege access principle by means of role-based access control principle is proved and guidelines on using it in distributed information processing systems are given.

Key words: access control principle, information security, access control efficiency.


DEFINING THE AUTOMATED TELECOMMUNICATION COMPLEX OF CONTROL SYSTEM STABILITY BASED ON FRACTAL DIMENSION OF THE STRUCTURE GRAPH TREE

S.D. Buslov, head of sector, JSC “Concern “Sozvezdie”, e-mail: serj_aist@mail.ru

Stability evaluation of info-communication system based on fractal dimension of the structure graph tree is suggested.

Key words: info-communication system, dynamic instability, stability evaluation, fractal dimension.


APPROACH TO NETWORK PROTOCOL SPECIFICATION LANGUAGE DESCRIPTION BASED ON PETRI-NET GRAMMAR

M.A. Kislyakov, lecturer, tel.: 8(863) 246-77-52
Ŕ.Ŕ. Donchenko, head of chair, tel.: 8-918-555-44-33
Rostov Military Institute
G.V. Nekhoroshev, head of Research and Engineering Center, JSC “Concern “Sozvezdie”, tel.: (4732) 52-25-56

Possibilities of communication protocol modeling and its realization basing on Petri-net mathematical apparatus generating a language that is more powerful as concerned to its descriptive capacity than the language of finite automaton are discussed. The usage of Petri-net grammar is supposed for designing the network protocol specification translator.

Key words: modeling, network protocols, Petri-net mathematical models.


TRANSLATING Ĺ-NETWORK LANGUAGE INTO HIGH-LEVEL PROGRAMMING LANGUAGE

Ŕ.Ŕ. Donchenko, head of chair, tel.: 8-918-555-44-33
M.A. Kislyakov, lecturer, tel.: 8-(863)-246-77-52
Rostov Military Institute
G.V. Nekhoroshev, head of Research and Technical Complex, JSC “Concern “Sozvezdie”, tel.: (4732) 52-25-56

Theoretical fundamentals for translating E-network language of formal protocol description into high-level programming language are presented. Procedures realizing elementary networks in Pascal language are presented.

Key words: network protocols, E-networks, Pascal language, protocol specifications.


TIME DEPENDENCIES OF ELECTROMAGNETIC COMPATIBILITY ENVIRONMENT CHARACTERISTICS RECORD FOR MOBILE RADIO ELECTRONIC MEANS GROUPS

A.D. Korobova, associate professor, Voronezh State University, tel.: (4732) 52-79-25
E.A. Khromykh, leading research engineer, JSC “Concern “Sozvezdie”, tel.: (4732) 52-08-33

Methodology for evaluating operative parameters of electromagnetic environment created by three-dimensional group of radio electronic means is discussed as well as its application for solving practical problems of electromagnetic compatibility and radio countermeasure.

Key words: electromagnetic environment simulation, mobile radio electronic means grouping, «MATHCAD».


SYNTHESIS OF THE GENERALIZED TWO-PHASE ALGORITHM FOR ANTENNA ARRAY ADAPTATION

A.V. Ryzhkov, deputy head of Curriculum Department, Voronezh Department of the Interior, tel.: (4732) 47-66-24

Synthesis of two-phase algorithm for antenna array adaptation designed for weak signal reception under interference conditions ten times exceeding the level of useful signal using modified Compton algorithm and L-problem moments algorithm is given.

Key words: adaptive antenna array, STC algorithm, antenna pattern, weighting coefficient vector, adaptive antenna array processor.


SHF MIXER MULTIFREQUENCY CHARACTERISTICS

L.I. Averina, associate professor, Chair of Electronics, Voronezh State University, e-mail: averina@phys.vsu.ru
Zh.V. Shaposhnikova, deputy head of department, JSC “Concern “Sozvezdie”, e-mail: zhanetta_sh@mail.ru

Calculations for multi-frequency characteristics of various-type SHF mixers by means of Volterra series are carried out from the point of view radio communication means jamming immunity improving in whole. Transistor bipolar model with local oscillator is developed which is used for modeling a mixer on its base. Various mixers (diode-balance one, FET resistor one and an active transistor one with local oscillator) blocking and intermodulation characteristic calculations and analysis are carried out depending on the operation mode and level of the local oscillator suppressed.

Key words: non-stationary Volterra series method, mixer, bipolar transistor with local oscillator, level of third order intermodulation products, blockage factor.


DEFINING THE IONIC CRYSTAL DISCRETE NANOSTRUCTURE GROWTH KINETICS AND ORIENTATION USING THE COMPUTER MODELING METHODS

D.B. Omorokov, engineer, JSC “Concern “Sozvezdie” e-mail: saref@list.ru
E.V. Shvedov, professor, Voronezh State Engineering University, e-mail: karl12@yandex.ru

The results for computer modeling of metallic cluster growth and their orientation on ionic crystals surface are given. The influence of separate anionic vacancies over the few-atom cluster orientation in the process of their nucleation and growth on the anionic vacancy and on the common absorption nodes is investigated. It was established that cluster orientation is determined by geometry of charge pattern in the vacancy neighborhood and the ratio of potentials depths of condensate atoms interaction with various substrate atoms (metal, halogen).

Key words: oriented crystallization, molecular dynamic simulation, cluster, discrete nanostructures, ionic crystal, vacuum condensing, discontinuous film.