Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
78
17
2019
THE MODEL OF PULSE RADIATOR WITH OUTPUT SIGNAL COMPRESSION IN HELICALLY COILED DIELECTRIC WAVEGUIDE
1509-1520
10.1615/TelecomRadEng.v78.i17.10
V. L.
Pazynin
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
M. V.
Maiboroda
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
A. A.
Shmat'ko
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
passive pulse compression
time reversal
modulated pulses
FDTD method
dielectric waveguide
Rigorous simulation of electromagnetic pulse compression induced by a filament of external current in a helically coiled segment of dielectric waveguide is performed. The width of the pulse spectral band is around two octaves, it ranges from 1.4 to 5.7 GHz. An 8-time compression of pulse duration has been obtained with dielectric waveguide length is just over than 2.5 m. The duration of output signal is 2 ns. The Time reversal method has been used for finding the time profile of the current pulse. It permits us to compensate (by an external source) the energy loss of the pulse under compression during its propagation along the waveguide and radiation into open space.
PARAMETERS OF EIGENWAVES AND EQUIVALENT PARAMETERS OF PERIODICAL BRAGG STRUCTURES
1521-1536
10.1615/TelecomRadEng.v78.i17.20
M. V.
Andreev
Oles Honchar Dnipro National University, 72, Gagarin Ave., Dnipro, 49010, Ukraine
V. F.
Borulko
Oles Honchar Dnipro National University, 72, Gagarin Ave., Dnipro, 49010, Ukraine
O. O.
Drobakhin
Dnepropetrovsk National University, Ukraine
Bragg-type layered structures
periodic structure
frequency selective mirror
photonic bandgap
metamaterials
equivalent material parameters
The problem of representing a periodic Bragg structure by an equivalent homogeneous layer is
under consideration. The relationship of the parameters of such layer and eigen parameters of the periodic structure is examined. For such relationship, the dependence upon frequency for some specific parameters of a layered dielectric structure is analyzed. An approach that makes it possible to obtain physically consistent values of the equivalent permittivity and permeability of the periodic Bragg structure is presented.
SIGNAL PROCESSING ALGORITHM IN MULTICHANNEL RESCUE RADAR
1537-1547
10.1615/TelecomRadEng.v78.i17.30
Oleg
Sytnik
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
sampling
discrete processing
radar
spectral function
sampling frequency
Bayesian risk
algorithm
criterion
white noise
The stochastic task of mutual detecting, estimating the number and angle position of slow-moving targets is formulated. The angular resolution algorithm for targets is built on the principle of statistical hypotheses testing. The concept of resolution, in contrast to the Rayleigh energy criterion, involves setting a numerical value for the probability of correct resolution (i.e., the probability of correctly indicating the number of targets in the zone of responsibility of the observation system). A priori information about the characteristics of signals and interference, when targets are moving, as well as their probabilistic properties, allows to build a signal processing procedure that provides a high resolution exceeds the energy limit criterion of Rayleigh. It is shown, that resolution win becomes higher when the signal-to-noise ratio is growing up. The digital signal processing procedure is performed in real time only under the assumption of linear unidirectional movement of targets relative to the antenna system of the radar. Analytical relations for the procedure of jointly detecting the targets and measuring the angle of arrival of their signals based on analysis of statistical hypotheses are obtained. The main performance characteristics of the radar system are calculated. Recommendations on the implementation of digital signal processing algorithms for real-time operation are given.
SIGNAL PROCESSING IN END DEVICES OF TELECOMMUNICATION AND MEDIA PATHS
1549-1557
10.1615/TelecomRadEng.v78.i17.40
A. I.
Alanssari
Department of Computer Engineering Techniques, Al Nisour University College, Nisour seq. 10012, Baghdad, Iraq
A.
Taher
Madenat Alelem University College, Iraq
digital signal processing
image quality
color perception model
uniform color space
adaptive television
multimedia systems
In the paper, we carry out the analysis of works on the construction of television and multimedia (T and MM) systems, signal processing, transmission, and reproduction. The classification of color perception models and their possible application in the end devices to improve the quality of the transmitted image is provided. The data are presented that indicate the need to use digital adaptive video signal correction systems. As the source image, the image of the color stripes, their digital signals, which are transmitted through end-to-end (T and MM) devices, were selected. The values of signal levels were obtained which can be used to determine the magnitude of the error classified according to the scale of subjective assessments - "no noticeable distortion", "noticeable, but acceptable distortion", and "unacceptable distortion". We also present a comparison of signal levels that were obtained using earlier color perception models with inaccuracies in the description of the blue and yellow color regions.
ON WGM RESONATOR TECHNIQUE FOR MICROWAVE CHARACTERIZATION OF SUPERCONDUCTORS IN NORMAL STATE
1559-1566
10.1615/TelecomRadEng.v78.i17.50
A. A.
Barannik
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
Alexey
Gubin
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
I. А.
Protsenko
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
S.
Vitusevich
Forschungszentrum Jülich GmbH, Institute of Complex Systems, Bioelectronic (ICS-8), Wilhelm-Johnen-Straße, D-52425 Jülich, Germany
M. V.
Vovnyuk
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
Nikolay T.
Cherpak
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
high-temperature superconductors
normal metals
complex
conductivity
surface impedance
Q-factor
millimeter wave range
The paper presents preliminary results on the analysis of the applicability of microwave measurement techniques for study the properties of superconductors in normal state using dielectric resonators excited with whispering gallery modes (WGM). The expressions for microwave surface impedance for a normal conductor are derived. The experimental technique for measuring the surface impedance of superconductors in a normal state using mm-wave sapphire WGM resonator is proposed and described. The reliability of the proposed approach is demonstrated measuring the response of a resonator with copper samples is presented.
METAMORPHOSIS OF 5G WIRELESS COMMUNICATION: A REVIEW
1567-1588
10.1615/TelecomRadEng.v78.i17.60
A.
Dhariwal
Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
V. Noor
Mohammed
Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
bandwidth
data rate
MIMO
mm wave
RAN
In these past few decades, we have witnessed the rise in technology at a very progressive rate
with introduction of the first generation (1G), the second generation (2G), the third generation
(3G), the fourth generation(4G) and now the fifth generation (5G) mobile technology is being deployed. Each generation is concentrated in terms of bandwidth and real-time applications. The channel and bandwidth have reached their capacity to hold and gorge the end users and also the number of connected devices which leads to channel bandwidth to reach its maximum capacity. In order to fulfill the demands of increasing users and connected devices a new technology is introduced which is know is 5G technology. The key advantages of 5G technology
as: utilized the millimeter wave (mm Wave) bandwidth, high throughput, and low latency. This paper is intended to provide a broad perspective on mobile generations and the evolutions from 4G to 5G technology.
CHANNEL EQUALIZATION BASED ON SFLA AND DSO TRAINED ARTIFICIAL NEURAL NETWORK
1589-1600
10.1615/TelecomRadEng.v78.i17.70
Samir
Saidani
Université 8 Mai 1945 Guelma, BP 401, Guelma 24000, Algeria
A.
Moussaoui
Université 8 Mai 1945 Guelma, BP 401, Guelma 24000, Algeria
M.
Ghadjati
Université 8 Mai 1945 Guelma, BP 401, Guelma 24000, Algeria
Artificial Neural Network (ANN)
Shuffled Frog-Leaping Algorithm (SFLA)
Directed Search Optimization (DSO)
adaptive channel equalization
digital communication
This paper presents a novel method for optimizing the weights of a neural network applied to channel equalization. Although several algorithms are found in the literature to update the weights of the neural networks, each one has their merits and drawbacks. Therefore, a learning algorithm is often modified, or even hybridized with another one in order to enhance their performances. In this context, the authors present a new approach based on two algorithms which are: Shuffled Frog-Leaping Algorithm (SFLA) and Directed Search Optimization (DSO). The updating strategy in the local search of the standard SFLA is substituted with the updating strategy of the DSO algorithm. For the global search, the authors kept the strategy of the SFLA algorithm. The proposed method is compared with the standard Particle Swarm Optimization (PSO), the Modified Shuffled Frog-Leaping (MSFLA) and the DSO algorithms to evaluate their performances for nonlinear channel equalization. The experiments reveal that the proposed method presents the best results and outperforms the other algorithms.