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SCIENTIFIC WORK

SCIENTIFIC AND TECHNICAL JOURNAL «RADIO COMMUNICATION THEORY AND EQUIPMENT» ISSUE 3, 2011

ROUTING PROTOCOL SIMULATION AND ANALYSIS FOR WIRELESS AD HOC NETWORKS

Yu.B. Nechaev, chief research engineer, JSC «Sozvezdie» Concern», e-mail: nechaev_ub@mail.ru
A.A. Epifantsev, engineer, JSC «Sozvezdie» Concern», e-mail: cxp87@mail.ru
D.J. Yermolin, student, Voronezh state university, e-mail: monk_@list.ru

AODV, DSDV, DSR routing protocol description is given. Estimation of wireless ad hoc network parameters based on the model constructed in a simulator ns2 is carried out.

Keywords: wireless networks, routing protocols.


INTERNAL PROGRAM ACTIONS IN TACTICAL NETWORK-CENTRIC AUTOMATIC CONTROL SYSTEMS

N.M. Radko, head of Research Testing Centre, tel.: (473) 252-36-25
M.Yu. Sukhorukov, leading engineer, tel.: 8-910-348-84-80
JSC «Sozvezdie» Concern»

Main features of internal program actions that take place in the case of network-centric control in the future TACS are discussed. Main approaches to investigating the harmful malicious codes penetration into processing operating environment are offered, the evaluation of their efficient impact probability is given.

Keywords: network-centric control, internal program actions, harmful code, operating environment, information security.


MILLIMETER WAVE ANTENNAE WITH OPTOELECTRONIC SCANNING

Yu.B. Nechaev, principal research engineer, JSC «Sozvezdie» Concern», e-mail: nechaev_ub@mail.ru
A.I. Klimov, professor, Voronezh Institute for Russian Department of the Interior, e-mail: alexserkos@inbox.ru
A.V. Zolotukhin, head of department, JSC «Sozvezdie» Concern», e-mail: zolalvas@mail.ru

The results of antenna computer simulation with one- and two dimensional optoelectronic scanning for millimeter wave radio communication systems are given.

Key words: antenna, millimeter waves, optoelectronic scanning, radiation pattern, radio communication system, automatic direction finding.


LINEAR PRECODER FOR MULTIPATH CHANNELS

Yu.B. Nechaev, principal research engineer, e-mail: nechaev_ub@mail.ru
A.A. Malyutin, head of Scientific and Technical Complex, e-mail: malyutin@nm.ru
D.V. Merkulov, research engineer, e-mail: merculov@newmail.ru
JSC «Sozvezdie» Concern»

Data transfer methods over multipath communication channels using transmitted signal linear precoding are considered basing on the transmission side channel characteristic awareness. Various ways to construct precoders as well as practical methods for their parameter optimization are offered. Characteristics of the offered circuits acquired through modeling are given.

Keywords: precoder, multipath channels, equalization, HF channel.


PERMUTATION MODULATION OF BAND-PASS SIGNALS

V.A. Makovy, senior staff scientist, JSC «Sozvezdie «Concern », e-mail: Makovij@mail.ru

Various ways for constructing the analyzer and synthesizer are considered at analog signal band-pass modulation. Algorithms for calculating the law of permutations for various numbers of rearranged bands are offered. Analytical expressions characterizing statistical properties of permutations are received. An original methodology to obtain a set of loosely coupled permutations for applying both in the duplex radio links and radio communication systems is offered.

Keywords: permutation modulation, narrowband interference, digital signal processing, radio communication, voice-band channel.


CASCADE PERMUTATION MODULATION

V.A. Makovy, head of Scientific and Technical Department, e-mail: Makovij@mail.ru
S.A. Chupeyev, head of department, tel.: (473) 252-09-04
JSC «Sozvezdie» Concern»

An original technique for increasing the transmission rate without expanding the frequency band by using permutation modulation is offered. A notation system to obtain signal-code structures is introduced. Analytical expressions that make it possible to define the maximum possible information rate via the offered modulation type and to define noise immunity under the impact of additive white Gaussian noise.

Keywords: radio communication, data transfer, permutation modulation, cascade permutation modulation, noise immunity, error probability.


FEATURES OF AMPLITUDE-FREQUENCY SPECTRA OF PHASE SHIFT KEYING BROADBAND SIGNALS WITH CHIRP RADIO PULSES AS CARRIER

V.D. Lukyanchikov, head of sector, tel.: (473)225-78-59
V.V. Liventsev, design engineer, e-mail: vlivencev@mail.ru
JSC «Sozvezdie» Concern»

An analytical expression for spectral density of spread spectrum signals with chirp radio pulses as carrier and binary pseudorandom sequences as phase code has been derived. Amplitude-frequency spectra plotted upon the above mentioned expression as well as by digital simulation have been compared.

Key words: chirp radio pulses, binary pseudorandom sequences, frequency deviation, pseudorandom sequence length, modulation characteristic slope, signal spectral density, amplitude spectrum, Fourier transform.


NON-STATIONARY LASER PULSE DETECTION IN INFORMATION SYSTEMS WITH RANDOM DELAY TIME

A.L. Mitrofanov, senior research engineer, tel.: (473) 223-31-92
A.A. Reshetnjak, graduate, e-mail: lony2003@mail.ru
JSC «Sozvezdie» Concern»

Laser non-stationary pulse detection results under random registration conditions and random delay time are acquired.

Key words: information systems, maximum likelihood, non-stationary laser pulse, delay time.


KINETICS OF GERM FORMING ON THE OPEN POROSITY SURFACE

V.A.Ammer, associate professor, Voronezh State Engineering University, tel; (473) 264-09-60
E.K. Belonogov, associate professor, Voronezh State Engineering University, tel; (473) 220-87-35
S.B. Kushev, professor, Voronezh State Engineering University, tel; (473) 246-76-33
D.B. Omorokov, engineer, JSC «Sozvezdie «Concern», e-mail: saref@list.ru
E.V. Shvedov, professor, Voronezh State Engineering University, e-mail: karl12@yandex.ru

Kinetics of nanocrystalline pattern formation on the composite membranes TiO2 at vacuum condensation of Pd from the steam is investigated. It was established that the selective infill of the substrate by exhausted atoms on the apical advanced surface is observed on the initial stage. Depth of the infill by exhausted atoms is estimated for different condensation parameters and different surface geometries. The closing of the pores and microcracks on the foils with open porosity and the resulting thickness on the crescent condensate layer, first of all, depend în the membrane pore dimension of and, also, on the substrate temperature and condensation rate. Calculated values obtained are in compliance with the experimental data.

Key words: nanostructures, forming kinetics, vacuum condensation routines, composite membranes, selective layer, exhausted atoms, strongly advanced surface, degree of selective infill of the substrate.


OPTIMIZATION OF THE TRUNCATED CONSECUTIVE PROCEDURE OF CHECKING MANY HYPOTHESES WITH CUTTING OFF LOW-PROBABLE HYPOTHESES

D.V. Baybekov, electronic engineer, Voronezh State Engineering University, e-mail: colorov@rambler.ru
S.A. Zhitenev, design engineer, JSC «Sozvezdie» Concern», e-mail: szhitenev@yandex.ru
V.V. Posmetyev, associate professor, Voronezh State Engineering University, e-mail: victorvpo@mail.ru

Influence of key parameters of the truncated consecutive procedure of checking many hypotheses with cutting off improbable hypotheses on its efficiency is examined. Recommendations for choosing threshold parameters to define the best hypothesis (α0) and cutting off low-probable hypotheses (β0) are formulated.

Keywords: consecutive procedure, check of hypotheses, image recognition, artificial intelligence.


ALGORITHM FOR TRACING ESTIMATION OF THE OBJECT LOCATION IN CASE OF COORDINATE COMMUNICATION LOSS

A.L. Mitrofanov, senior research engineer, JSC «Sozvezdie «Concern», tel.: (473) 223-31-92

An algorithm for tracing estimation of the object location when its communication with the control station has been lost while moving across the known terrain is derived.

Key words: object, coordinates, detection.


INTERPOLATION TECHNIQUE ANALYSIS OF DELTA MODULATION ESTIMATE

N.I. Kozlenko, deputy head of Scientific and Technical Centre, tel.: (473) 252-12-44
A.N. Mokrousov, leading design engineer, tel.: (473) 252-12-44
JSC «Sozvezdie» Concern»

Linear and non-symmetric stepwise interpolation of delta-modulation estimator continuous values via its discrete samples is discussed. Optimum values of standard mean square error in transmission by using standard Gaussian signal delta-modulation technique with a voice averaged correlation function and voice signal at the specified interpolation types.

Keywords: asymmetrical step DM, linear DM.


EXPANSION OF MULTIDIMENSIONAL SCALING APPLICATION

V.Ì. Zinchuk
Yu.S. Pavlov, leading research engineer, tel.: (473) 252-58-22
JSC «Sozvezdie «Concern»

Information concerning the history and development of the multidimensional scaling method is given. Also, the existing versions of its implementation traditional method are stated. The concept of indirect multidimensional scaling which generalizes and considerably develops its conventional methodology. Finally, the paper presents possible mediation concretization ways for multidimensional scaling method on the basis of four well-known mathematical simulation strategies.

Keywords: data analysis, paired comparison, space metric, multidimensional metric and nonmetric scaling, coordinate space, proximity estimation, mediation reflection, game theory, Markov chains, flow-oriented model, fractal technique.


LASER RADIATION PHOTOCOUNT STATISTICS APPROXIMATION

V.I. Parfenov, professor, tel. : 8-908-146-69-96
V.S. Kirillov, graduate, tel. : 8-908-136-51-69
Voronezh State University

Distributions of photocounts for optical quantum generator with fluctuating amplitude and additive mixture of such generator signal with Gaussian noise are found. The possibility of found distributions approximation by simpler distributions is investigated.

Key words: laser radiation, distribution of photocounts, approximation of distribution function.