Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
72
6
2013
GENERALIZED MODEâ€MATCHING TECHNIQUE IN THE THEORY OF GUIDED WAVE DIFFRACTION.PART 2: CONVERGENCE OF PROJECTION APPROXIMATIONS
461-467
10.1615/TelecomRadEng.v72.i6.10
I. V.
Petrusenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine; University of Customs Affair and Finances, 8, Rogaleva St., Dnepropetrovsk 49000, Ukraine
Yuriy
Sirenko
IRE NAN Ukraine
modeâ€matching technique
truncation of matrix operator
operatorbased Fresnel formulas
projection convergence
A rigorous justification of applicability of the truncation procedure to solution of infinite matrix equation of the modeâ€matching technique still remains an open question throughout the years of its intensive use. The generalized modeâ€matching technique suggested for solving the problems of mode diffraction by a stepâ€like discontinuity in a waveguide leads to the Fresnel formulas for matrix operators of wave reflection and transmission, rather than to standard infinite systems of linear algebraic equations. The present paper is aimed at constructing projection approximations for the mentioned operatorâ€based Fresnel formulas and investigating
analytically the qualitative characteristics of their convergence. To that end the theory of operators in the Hilbert space is used. The unconditional strong convergence of the finitedimensional approximations of the operatorâ€based Fresnel formulas to the true scattering
operators is proved analytically. The condition number of the truncated matrix equation is estimated. The obtained results can be used for a rigorous justification of the modeâ€matching technique intended for efficient analysis of microwave devices.
PROPERTIES OF SOME MATRIX OPERATORS APPEARING IN THE THEORY OF PLANAR WAVEGUIDE JUNCTIONS
469-484
10.1615/TelecomRadEng.v72.i6.20
V. P.
Chumachenko
Zaporizhzhya National Technical University
domainâ€product technique
matrix operators
waveguide
discontinuities
In the paper infinite sets of linear equations are investigated which arise in the course of applying the domainâ€product technique to analyzing flatâ€bed waveguide transformers with a convexâ€polygonal junction plane. Blocks of the system matrix describing the interaction of sides of the polygon are considered in the capacity of operators in the sequence space l1. It is shown that each operator of the kind for adjacent sides can be represented as a sum of a completely continuous operator and the contraction operator. Results of the study are used to justify the solvability by the reduction technique of systems corresponding to the triangular region. It is proved the set of matrix equations arising in the case of an Ð•â€plane structure can be considered in the space l1(3) = l1 ⊕ l1 ⊕ l1 in the capacity of a functional equation with the Fredholm operator. It is shown that this equation can be solved by the projection technique convergent in the norm of the mentioned space. Similar results are obtained in the case of the Ðâ€plane problem.
DIGITAL IMAGE RECONSTRUCTION BY USING ROW PRE−DISTORTION AND THIRD−ORDER MOMENT FUNCTION ESTIMATION
485-494
10.1615/TelecomRadEng.v72.i6.30
J. T.
Astola
Tampere University of Technology, Signal Processing Laboratory, P. O. Box 553, FIN-33101, Tampere, Finland
Karen O.
Egiazarian
Tampere University, Department of Signal Processing, P. O. Box 553, FIN-33101, Tampere, Finland
A. V.
Totsky
National Aerospace University (Kharkiv Aviation Institute), 17, Chkalov St., Kharkiv, 61070, Ukraine
image reconstruction
pixel
jitter
bispectral density
The problem of search the optimal parameters of additive and multiplicative pre-distortion functions that are used for reconstruction the digital images corrupted by jitter and mixture of the additive Gaussian and impulsive noise is considered. The results of processing different kinds of test images are represented by using row-by-row image restoration with third-order moment function estimation. Performance of proposed techniques and image reconstruction
accuracy are studied by computer simulations. It is shown that the suggested techniques can effectively remove heavy jitter distortions in the background of the additive Gaussian and impulsive noise.
PROPOSED A NEW APPROACH FOR VOICED / UNVOICED DECISION OF SPEECH FILE USING LAGRANGE TECHNIQUE
495-504
10.1615/TelecomRadEng.v72.i6.40
Nidaa F.
Hassan
University of Technology, Baghdad, Iraq
Hala Bahjat Abdul
Wahab
University of Technology, Baghdad, Iraq
Speech Recognition
Lagrange interpolation
voiced/unvoiced
decision
In speech analysis, voiced/unvoiced decision is usually performed in extracting the information from the speech signals. This paper presented a new approach for voiced/unvoiced (V/UV) decision; the approach is used Lagrange polynomial interpolation for voiced/ unvoiced signals speech decision, depending on the advantage of the characteristics of the interpolation techniques. Speech file is divided in different size of blocks, each block is evaluated by Lagrange technique, and the results are evaluated by one of most popular voiced/unvoiced measured
which is the short time energy classifier. The results show that Lagrange technique worked well as classifier and give an accepted decision to analysis the speech to voice and unvoiced sample, especially with small size non overlapping blocks.
ON THE DECAY INSTABILITY OF ELECTRONIC WAVES IN THE VAVILOV − CHERENKOV EFFECT
505-517
10.1615/TelecomRadEng.v72.i6.50
S. I.
Khankina
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
Vladimir M.
Yakovenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
charged particle
electronic wave
decay instability
the Vavilovâ€Cherenkov effect
The decay instability effect at the interaction of electronic waves with electromagnetic and electrostatic waves has been studied in material media. The corresponding expressions for the instability increment are obtained. It is shown that the Vavilovâ€Cherenkov effect can be represented as a scattering process of inelastic scattering of electrons on the electronâ€induced
waves.
PECULIARITIES OF AUTOWAVE MOTIONS IN BOUNDED EXCITABLE MEDIA CONTAINING ACTIVE PARAMAGNETIC CENTERS
519-546
10.1615/TelecomRadEng.v72.i6.60
D. N.
Makovetskii
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
selfâ€organization
rotating spiral autowaves
threeâ€level excitable media
The paper is devoted to computer investigations of selfâ€organized autowave motions in bounded nonequilibrium systems of the excitable type including, in particular, phasers with paramagnetic active centers. The presence of not only local activation, but also local inhibition
of excitations, which influences essentially the mechanism of the selfâ€organization of autowaves, is a feature of microscopic interaction between such active centers. The special attention is given to the study of rotating spiral autowaves, taking into account the channels of local inhibition of excitations. It was shown that in a system with local inhibition of excitations the reverberator rotating spiral autowaves (containing dynamic cores) are dominating, and they depress the Wiener rotating spiral autowaves (containing dynamic cores). The phenomenon of the regeneration of reverberator rotating spiral autowaves, which appears in a form of a nonlinear «reflection» of rotating spiral autowaves from the absorbing boundary of a medium, was revealed. The conditions at which the regeneration of rotating spiral autowaves is accompanied by the selfâ€induced inversion of the topological charge of rotating spiral autowaves
are found. The sliding mode of a core of rotating spiral autowaves along the boundary of an active medium was observed for the first time. The mechanisms of these phenomena caused by the role of local inhibition of excitations in processes of the selfâ€organization of rotating spiral autowaves are discussed.
MEASUREMENT OF SIZE OF MICRO − PARTICLES BY OPTICAL METHOD WITH DIGITAL PROCESSING OF LIGHT SCATTERING PATTERN
547-554
10.1615/TelecomRadEng.v72.i6.70
N. G.
Kokodiy
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61022,
Ukraine; National University of Pharmacy, 53 Pushkinkaya St., Kharkiv, 61027,
Ukraine
S. V.
Lizogubenko
V. Karazin Kharkiv National University, 4, Svobody Sq., 61022 Kharkiv, Ukraine
Ðœ. V.
KÐ°ydash
National Pharmaceutical University, 53, Pushkinska St., 61002 Kharkiv, Ukraine
microâ€particles
measuring
sizes
light
diffraction
digital method
The method is proposed to process the pattern of light scattering by microâ€particles obtained by a digital camera. The objective of the method is to measure the size of small particles.