Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
78
15
2019
OPTICAL PROPERTIES OF CDS HETEROLAYERS RECEIVED BY ISOVALENT SUBSTITUTION ON B-ZNS SUBSTRATES
1317-1322
10.1615/TelecomRadEng.v78.i15.10
Victor P.
Makhniy
Yuri Fedkovych Chernivtsi National University, 2 Kotsyubynsky St., Chernivtsi, 58012, Ukraine
M. M.
Berezovskiy
Yu. Fedkovych Chernivtsy National University, 2 Kotsubynsky St, Chernivtsy, 58012, Ukraine
O. V.
Kinzerska
Yuri Fedkovych Chernivtsi National University, 2 Kotsyubynsky St., Chernivtsi, 58012, Ukraine
admium sulfide
zinc sulfide
isovalent substitution
heterolayer
optical spectra
band gap
spin-orbit splitting
Optical spectra of cadmium sulfide heterolayers obtained by the method of isovalent substitution on cubic zinc sulfide single-crystal substrates are analyzed. The experimental differential reflectance spectra R'ω of substrates and heterolayers each contain two peaks, which
are characteristic of direct-gap semiconductors of the cubic modification. The main peak A on the curves R'ω is consistent with the band gap Eg β-ZnS and β-CdS, and the peak B is shifted from it to high energies by the magnitude of the spin-orbit interaction Δso, the value of which for β-CdS was 0.33 eV. A small shift (10-30 meV) of the maximum transmission spectrum of the CdS/ZnS heterostructure to the low-energy side with respect to Eg β-CdS is adequately explained by the Bouguer law.
COMPUTER SIMULATION OF A THIN-FILM SOLAR CELL WITH DOUBLE-SIDED COATING OF ALUMINUM NANOPARTICLES
1323-1332
10.1615/TelecomRadEng.v78.i15.20
A. B.
Gnilenko
Oles' Honchar Dnipro National University, 72 Gagarin Ave., 49010, Dnipro,
Ukraine
S. V.
Plaksin
Institute of Transport Systems and Technology
National Academy of Sciences of Ukraine
5 Pisarzhevskogo St., Dnipro, 490056, Ukraine
solar radiation
amorphous silicon
FDTD method
Silvaco TCAD
A numerical simulation of an amorphous silicon thin-film solar cell with double-sided coating of aluminum nanoparticles above and below the photoactive layer was carried out. The distribution of solar radiation intensity in the photoactive layer of amorphous silicon was calculated using FDTD method, and the basic electrical characteristics of the solar cell were obtained. For the considered solar cell design, optimal sizes and arrangement of nanoparticles were found and the possibility of increasing the solar cell efficiency due to solar radiation retention in the photoactive layer was demonstrated.
A NOVEL IMPLEMENTATION OF SNR ESTIMATION BASED ON LARGE SCALE PROGRAMMABLE LOGIC CIRCUITS
1333-1344
10.1615/TelecomRadEng.v78.i15.30
W.
Wang
Qingdao University, 308 Ningxia Road, Qingdao, Shangdong, P.R. of China, 266071
H.
Zhang
Qingdao University, 308 Ningxia Road, Qingdao, Shangdong, P.R. of China, 266071
Zh.
Shen
Qingdao University, 308 Ningxia Road, Qingdao, Shangdong, P.R. of China, 266071
P.
Wang
Qingdao University, 308 Ningxia Road, Qingdao, Shangdong, P.R. of China, 266071
G.
Ren
Qingdao University, 308 Ningxia Road, Qingdao, Shangdong, P.R. of China, 266071
S.
Wang
Qingdao University, 308 Ningxia Road, Qingdao, Shangdong, P.R. of China, 266071
Yu.
Zheng
Qingdao University, 308 Ningxia Road, Qingdao, Shangdong, P.R. of China, 266071
S. N.
Shulga
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
SNR
FPGA
computation of data stream
buffer of data streams
The signal-to-noise ratio (SNR) is a major technical parameter to value the quality of communication system. The research of SNR estimator is still staggering in algorithm improvement and software implementation. In this paper, we proposed an effective method to implement SNR estimator based on hardware logic circuit by calculating the mean and variance of the demodulated envelope signal. The proposed SNR can reflect the channel status in real time, because calculation of data streams and reading/writing buffer can be execute without time intervals via alternating periods of time control. The testing results show that the SNR estimator has a good response to the channel condition under the interference of different noise power. According to the results, it can be found that the approach we proposed can be applied to the physical layer of the communication system, and the method has the significant
merits for many modulation schemes and channel models.
MULTI-LEVEL WAVELET BASED IMAGE CODING OVER LIFTING SCHEME FOR EMBEDDED WIRELESS DEVICES
1345-1353
10.1615/TelecomRadEng.v78.i15.40
Kh. Kh.
Hasan
Tikrit University, AL-Shirqat College of Engineering, Salahadin, Province,
P.O.Box: 42 Iraq
T. M.
Khalaf
Tikrit University, Tikrit, Salahadin Province, P.O. Box:(42), Iraq
K. Kh.
Shakir
Tikrit University, Tikrit, Salahadin Province, P.O. Box:(42), Iraq
M. U.
Barrak
Tikrit University, Tikrit, Salahadin Province, P.O. Box:(42), Iraq
lifting scheme
5/3 wavelet transform
in-place computation
symmetric extension
This paper provides a concise synopsis in the application of Lifting Scheme (LS) in wavelet image coding. Lifting theorem was applied via LS 5/3 wavelet transform to develop a design wherein multipliers are replaced with shifters, thus lowering the volume of operations entailed in the process of computing a DWT to approximately one-half of the requisite volumes of a convolution approach. Consequently, the computations required for image coding are reduced and less intricate. In addition, the lifting scheme can be modified to meet the demands of in-place computation, for DWT to be implemented in low memory systems, which presents a unique solution to the issues associated with existing time consuming software algorithms. This LS filter consists of integer adder units and binary shifter instead of multiplier and divider units found in convolution based filters; thus it has been modified to provide energy efficient hardware performance. The low power 5/3 LS based wavelet transform involves solutions developed to resolve the energy and bandwidth communication problems related to image data transmission. These solutions entail constructing 2D-DWT image codec architecture to save the computational and communication energy erstwhile dissipated in existing architectures.
BUILDING A PASSIVE-ACTIVE RADIO-METEOROLOGICAL MEASURING SYSTEM BASED ON DUAL-FREQUENCY RADAR
1355-1367
10.1615/TelecomRadEng.v78.i15.50
Anatoly
Mogyla
O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine
I. M.
Mytsenko
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
O. A.
Voytovich
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
Stanislav I.
Khomenko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
dual-frequency radar
passive-active radio-meteorological measuring system
combined transmitting/receiving antenna
water content profile
liquid water path
rainfall intensity
radio-thermal radiation
reflected signal
The concept of constructing a two-range passive-active radio-meteorological measuring system has been developed. In each range, the active and passive channels are mutually synchronized and operate simultaneously using a combined receiving and transmitting antenna, which ensures observation of radio-thermal self-radiation and reflections of probing signals from meteorological objects in the same volume. This permits to increase the information content of the system, to study the evolution of clouds, to improve the measurement accuracy of their water content and precipitation intensity and to display the meteorological situation in real time in two frequency ranges. Such advantages are provided by a high degree of isolation between the active and passive channels in the two frequency ranges due to adjusting the frequency of the local oscillator of the passive channel to the center frequency of the frequency range of the active channel.
DESIGN AND DEVELOPMENT OF CIRCULARLY POLARIZED DIFFERENTIAL FEED MAGNETO-ELECTRIC DIPOLE ANTENNA
1369-1376
10.1615/TelecomRadEng.v78.i15.60
Neetu
Department of Electronics and Communication, Manipal University Jaipur, Dehmi Kalan, Near GVK Toll Plaza, Jaipur-Ajmer Expressway, Jaipur, Rajasthan 303007, India
circularly polarization
magneto-electric dipole antenna
A simple ultra-wideband, circularly polarized, magneto-electric dipole antenna with differential feeding structure is proposed. The differential feeding structure has been used not only to excite the proposed antenna but it also eliminates the need of balun. Electric dipole with novel semi concave shape has been designed to achieve circular polarization. Results indicate that the designed antenna achieves a wide differential impedance bandwidth of 133.3% in the frequency range 0.5 GHz-2.5 GHz, for VSWR below 2. The 3-dB axial ratio bandwidth is 70.9% in the frequency range 1.0 GHz-2.1 GHz. With the impact of semi-concave electric dipole, the designed antenna is able to achieve peak gain of 6.5 dBi. The antenna also exhibits broadside radiation pattern with almost identical E-plane and H-plane radiation patterns and low cross polarization, in the given frequency range. The antenna is suitable for various wireless communication applications meant for S band like telemetry and radar.
DESIGN AND DEVELOPMENT OF IMPROVED FRACTAL MIMO ANTENNA
1377-1387
10.1615/TelecomRadEng.v78.i15.70
S.
Sudhashree
Rajalakshmi Engineering College, Thandalam, Chennai-602105, Tamilnadu, India
S.
Chitra
Department of Electronics & Communication Engineering, Rajalakshmi
Engineering College, Rajalakshmi Nagar, Thandalam, Chennai-602115, Tamil
Nadu, India
antenna array
CPW feed
MIMO
triangular patch fractal antenna
The design and development of a 23 triangular patch fractal multiple input multiple output (MIMO) antenna with the improved gain and bandwidth is presented in this paper. The MIMO structure is framed by integrating the elements such as coplanar waveguide feed and triangular patch fractal antenna array. The combined element is designed and fabricated. The proposed antenna is designed using HFSS software and the antenna parameters are validated using Vector network analyzer (E5071C ENA). The comparison is made between the simulated and fabricated results. The results show that the proposed antenna can be able to yield minimum return loss, larger bandwidth and improved gain at the designed resonant frequency.
BEAMFORMING IN MICROSTRIP PATCH ANTENNA ARRAY
1389-1398
10.1615/TelecomRadEng.v78.i15.80
A. K.
Singh
Sikkim Manipal Institute of Technology, Sikkim Manipal University,
Majitar, Rangpo, Sikkim 737136, India; National Institute of Technology Durgapur, Mahatma Gandhi Rd, A-Zone,
Durgapur, West Bengal 713209, India
Rabindranath
Bera
Department of Electronics and Communication Engineering, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Majitar, Rangpo, East Sikkim 737136, India
Bansibadan
Maji
National Institute of Technology Durgapur, Mahatma Gandhi Rd, A-Zone, Durgapur, West Benga 713209, India
Samarendra Nath
Sur
Electronics and Communication Engineering Department, Sikkim Manipal Institute of Technology, Sikkim Manipal University, East
Sikkim, Majhitar, Rangpo, 737136, India
P.
Kumar
Department of Electronics & Communication Engineering, Manipal Institute of
Technology, Manipal Academy of Higher Education, Manipal, Karnataka 576104,
India
Microstrip patch antenna
array antenna
HFSS
rectangular array
Microstrip Patch Antenna (MPA) with narrow beam is proposed in this paper. An intention is to put forward this work to show that MPA can be used to make antennas of directional nature with focused beam. Proposed system is an array of antenna using MPA without going in the domain of multiple antenna system, thereby reducing the need of separate feed to individual antennas to a common feed. The points which are considered in this work are decrement of beam-width with increase in array size and close look on the gain of the resultant antenna. All the simulated designs are carried out at the frequency of 11 GHz with a ground size for single patch antenna as (10.5×15×1.6) mm. However, the size of the ground changes with different array configuration. The software platform used for this work is High Frequency Structure Simulator (HFSS) and the prototypes were fabricated on FR4 epoxy board. The difference in the radiation pattern, gain and beam-width of the antenna is shown in the later section of the paper for different array configuration.
ACCURACY IMPROVEMENT OF VOR/VOR NAVIGATION WITH ANGLE EXTRAPOLATION BY LINEAR REGRESSION
1399-1412
10.1615/TelecomRadEng.v78.i15.90
I. V.
Ostroumov
National Aviation University, 1 Kosmonavta Komarova St., 03058, Kyiv, Ukraine
N. S.
Kuzmenko
National Aviation University, 1 Lubomyra Husara Ave., 03058, Kyiv, Ukraine
very high frequency omnidirectional range
linear regression
spline function
navigation
positioning
accuracy
total system error
aircraft
Current angular-based navigational aids do not meet the requirements of Performance-Based Navigation concept due to high errors of positioning. A new approach with the usage of multiple VOR/VORs has been represented. An approach is based on a usage of a linear regression model for VOR (VHF Omnidirectional Range) data extrapolation. The optimal pair of VORs accompanied with predicted VORs data from available ground stations are proposed to use in navigation equations to detect aircraft location. The represented approach doesn't require any changes in equipment besides software updating. Performance analysis grounded on dilution of the precision coefficient for multiple VOR locations was done. An approach was verified with the help of ADS-B data and decreasing in total system error was reached due to multi VOR approach implementation.