Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
75
14
2016
PARAMETRIC SYNTHESIS OF OVERLAY NETWORKS WITH SELF-SIMILAR TRAFFIC
1231-1241
10.1615/TelecomRadEng.v75.i14.10
D.V.
Ageyev
Kharkiv National University of Radio Engineering and Electronics, 14, Nauka Ave, Kharkiv, 61166, Ukraine
М.Т.
Salah
Kharkiv National University of Radio Engineering and Electronics, 14, Nauka Ave, Kharkiv, 61166, Ukraine
communication network
parametric synthesis
multilayer graph
aggregated commutative process
Review of the existing methods used in the structural and parametric synthesis of modern information and communication systems is presented, an approach is also proposed that makes it possible to take into account the impact of the protocol stack in the synthesis of these systems. The proposed model, based on the model in the form of a multilayer graph and self-similar traffic, takes into account a different type of data units transmitted at different levels of overlay networks.
SIMULATIVE INVESTIGATION OF WDM ROF SYSTEMS INCLUDING THE EFFECT OF THE RAMAN CROSSTALK USING DIFFERENT MODULATORS
1243-1254
10.1615/TelecomRadEng.v75.i14.20
Abhimanyu
Nain
Department of Electronics & Communication Engineering, GJUS&T Hisar,
Haryana, India, 125001
S.
Kumar
University Institute of Engineering and Technology, MD University, NH10, Rohtak, India
Radio over Fiber (RoF) networks
DE-MZM
OPM
Raman crosstalk
The WDM system has facilitated communication links to realize large bandwidth of optical fiber making it the preference for future communication networks. But WDM system comes with a liability in the form of crosstalk due to non linear effects. The Raman effect induced crosstalk is one of the major mortifying factors. This paper presents a simulative investigation and comparison between two WDM systems based on Dual Electrode Mach Zehender Modulator (DE-MZM) and Optical Phase Modulator (OPM) including the effects of the Raman crosstalk. Two 16 channels WDM systems are designed using DE-MZM and OPM respectively. The models are analyzed for various values of the Raman Gain coefficient (Fr) ranging from 0.2 to 0.8 and transmission distance varied from 20 to 50 km. The energy transfer takes place from higher to lower frequency channels as the signal is transmitted along the fiber. It has been observed that based on OPM system energy transfer is lesser in comparison to the DE-MZM based system. The energy transfer is found to be 2 and 1 dB lesser in OPM based system when Fr is kept at 0.2 and 0.8 at transmission distance of 20 km. Transmission distance also influences Raman effect induced energy distribution among channels.
AN APPROACH TO PREDICTION AND PROVIDING OF COMPRESSION RATIO FOR DCT-BASED CODER APPLIED TO MULTICHANNEL REMOTE SENSING DATA
1255-1269
10.1615/TelecomRadEng.v75.i14.30
R.A.
Kozhemiakin
Dept 504, National Aerospace University, 17 Chkalova Str., 61070, Kharkiv, Ukraine
V. V.
Lukin
National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St.,
Kharkiv, 61070, Ukraine
S. K.
Abramov
Department of Transmitters, Receivers and Signal Processing, National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St.,
Kharkiv, 61070, Ukraine
M.
Simeunovic
University of Montenegro, Podgorica, Montenegro
B.
Djurovic
University of Montenegro, Podgorica, Montenegro
I.
Djurovic
University of Montenegro, Cetinsky put bb, 81000, Podgorica, Montenegro
lossy compression
DCT
remote sensing
multichannel images
compression ratio prediction
We propose and study an approach to compression ratio prediction and providing with application to multichannel remote sensing images. DCT-based compression techniques, both 2D applied component-wise and 3D applied to sub-band groups, are considered. It is shown that compression ratio can be predicted for component-wise processing of multichannel images using a simple modification of approach proposed recently for coding single-component images, either noise-free or corrupted by different types of noise where an input parameter used in prediction is percentage of zeros in AC DCT-coefficients after quantization. It is also demonstrated that compression ratio can be predicted for 3D coders applied to multichannel image as a whole or as a set of groups of channels. Such a prediction, under certain conditions, allows also providing a desired compression ratio within a procedure that does not require multiple compression. The approaches are tested for Landsat multichannel remote sensing data.
EFFICIENT ESTIMATION OF VISUAL OBJECT RELEVANCE DURING RECOGNITION THROUGH THEIR VECTOR DESCRIPTIONS
1271-1283
10.1615/TelecomRadEng.v75.i14.40
V. A.
Gorokhovatskiy
Kharkiv Educational and Scientific Institute of State Higher Educational Institution
(SHEI) "Banking University" Kharkiv, Ukraine
computer vision
image database
structural image recognition
characteristic features
tf-idf weighting scheme
median processing
vector description
similarity measure
relevance
performance of recognition
The paper is devoted to some aspects of structural descriptions matching in course of visual object recognition in computer vision systems. The suggested here structural recognition technique employs both the "tf-idf" method used in the information retrieval and the median processing of descriptions. This technique was successfully applied to transform a description consisting of a set of image features into a vector of features or a list of descriptors, which essentially reduces the computational costs. The experimental results confirmed the adequacy and efficiency of the suggested techniques.
SIMULATION AND EXPERIMENTAL RESEARCH ON CW KLYNOTRON IN FREQUENCY RANGE 125−135 GHZ
1285-1297
10.1615/TelecomRadEng.v75.i14.50
Yu. S.
Kovshov
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
S. A.
Kishko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
S. S.
Ponomarenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
S. A.
Vlasenko
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
Yu.S.
Novikova-Korotun
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. V.
Zavertanniy
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura Str., Kharkiv 61085, Ukraine
A. N.
Kuleshov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
klynotron
multi-stage grating
dispersion
coupling impedance
optimal phase shift
beam-wave interaction
Compact electromagnetic radiation sources are an integral and important part of many modern applications, for which it is crucial to provide a continuous-wave (CW) operation with the output power of several watts or higher in millimeter and sub-millimeter ranges, for example, to enhance the sensitivity of DNP NMR spectroscopy. We used the results of performance tests of 2mm CW klynotrons to simulate the parameters of a CW klynotron with the central operating frequency of 130 GHz. On analyzing the performance characteristics of the sources the frequency dependence of the space charge, Pierce parameter and the system electrical length was defined. The obtained parameters were used to calculate the slow-wave structure (grating) and to simulate the operation parameters of klynotron tubes incorporating such structures. The simulation results served as a basis for designing klynotrons with homogeneous and four-stage slow-wave structures. The experimental part of the study was focused on a source with a homogeneous slow-wave structure which generated oscillations within the range 125−135 GHz. The dependences between the starting current, beam current and required focusing magnetic field were defined. The experimental test showed a good agreement between the empirical data and simulation results. The suggested method can be applied for simulating CW klynotrons in both millimeter and sub-millimeter ranges.
FREQUENCY TUNING RANGE OF DIFFRACTION RADIATION OSCILLATOR WITH PERIODICAL DOUBLE COMB
1299-1312
10.1615/TelecomRadEng.v75.i14.60
I.O.
Kovalyov
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. S.
Miroshnichenko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
diffraction radiation oscillator
open resonant system
periodic structure
double comb
millimeter waves
Diffraction radiation oscillators (DRO) are ranked high as advanced sources for millimeter and T-wave ranges, hence their output characteristics are subject to a continuous improvement to meet ever growing requirements. In this work we consider the relations between parameters of a periodic double comb and the tuning range width of a diffraction radiation oscillator. It is shown that the tuning range width strongly depends on the H10-wave elongation in elementary waveguides constituted by opposing slots of the double comb. We also discuss the results of experimental measurements and 2D-simulation of the open resonant system properties, which were used to choose the optimal parameters of a double comb for a diffraction radiation oscillator to satisfy the following criteria: an extended tuning range and a high-Q oscillations. The goal of our experiments was to analyze the properties of an 8-mm DRO with double combs of various configuration.
PRINCIPLES OF UNIVERSALIZATION OF MICROWAVE FACILITIES FOR DIAGNOSTICS OF SMALL-SCALE OBJECTS
1313-1320
10.1615/TelecomRadEng.v75.i14.70
Yu. Ye.
Gordienko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine; Kharkiv National University of Radio Engineering and Electronics, 14 Nauka Ave,
Kharkiv, 61166, Ukraine
Ihor M.
Shcherban
Kharkiv National University of Radio Engineering and Electronics, 14, Nauka Ave, Kharkiv, 61166, Ukraine
A.V.
Levchenko
Kharkiv National University of Radio Engineering and Electronics, 14, Nauka Ave, Kharkiv, 61166, Ukraine
scanning microwave
microscopy
microwave sensor
resonator probe
tip
The principles of universialization of microwave facilities for diagnostics of different objects in a wide operating frequency range with a required locality are substantiated. A basic principle is the application of an aperture resonator measuring converter and a modulation system of the automatic frequency control (AFC) of a driving microwave oscillator by the measuring converter. The measuring converter aperture having a coaxial structure forms a local microwave probe. Fundamental signals are extracted in the analog form via the AFC system and after ADC they are processed by the standard digital technology. The quantitative dependences are given which characterize a possibility of optimizing the locality and sensitivity of tools by choosing the geometry of the aperture assembly. These diagnostics might be applied for investigations of the physical properties of thin film, biological objects, metamaterials, elements of thin-film electronics etc.