Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
73
3
2014
PARTIAL DOMAIN TECHNIQUE CONSIDERING FIELD SINGULARITIES IN THE INTERNAL PROBLEMS WITH ARBITRARY PIECEWISE-COORDINATE BOUNDARIES: PART 2. PLANE-TRANSVERSE JUNCTIONS AND "IN-LINE" OBJECTS
187-201
10.1615/TelecomRadEng.v73.i3.10
S. O.
Steshenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
S. A.
Prikolotin
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
A. A.
Kirilenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
D. Yu.
Kulik
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
L. A.
Rud'
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
S. L.
Senkevich
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
microwave elements
partial domain technique
orthogon
the Cartesian coordinates
The generalized partial domain technique is analyzed as applied to calculation characteristics of the plane-transverse junctions of waveguide sections with arbitrary piece-wise coordinate (orthogon) cross-section in a Cartesian coordinates and "in-line" devices on their basis. The peculiarities of the geometry of specific problems, which allow improving the computation efficiency, are analyzed. The validity of the obtained algorithms is investigated.
AN ANALYTICAL SOLUTION TO THE PROBLEM OF DIPOLE MODE COUPLING IN RESONATORS WITH A SMALL HOLE
203-219
10.1615/TelecomRadEng.v73.i3.20
M.I.
Ayzatsky
National Scientific Center "Kharkov Institute of Physics and Technology" 1, Akademicheskaya St., NSCKIPT, 61108 Kharkov, Ukraine
K.Yu.
Kramarenko
National Scientific Center "Kharkov Physicotechnical Institute", National Academy of Sciences of Ukraine 1, Academicheskaya St., Kharkiv 61108, Ukraine
cylindrical cavity
dipole modes
coupling factor
The problem of dipole mode coupling in resonant cavities is of great importance for practical applications since it is the basic one for describing axially-asymmetric oscillations in iris-loaded waveguides. Oscillations of the kind are responsible for the transverse displacement of the accelerated beam and, consequently, for the development of the transverse instability in the linear resonance accelerators. Until recently there has been no method capable of calculating coupling factors of the cavity dipole modes under various assumptions concerning geometries of the coupling apertures and cavities based on the rigorous electrodynamic approach. For this reason these coefficients were calculated by approximate methods which are based on the solutions of the electrostatic and magnetostatic problems. We have presented the electromagnetic fields in different regions in the form of expansions in the complete sets of eigenfunctions consisting of solenoidal and potential subsystems. The infinite sets of algebraic equations derived through applying boundary conditions were transformed into sets of paired integral equations. Analytical solutions have been obtained for these equations. Analysis of the solutions has shown that the expansion of the tangential component of the electric field on across the aperture with respect to a small parameter (~α) contains no zero-order approximation. The electric field tangential component is proportional to both the magnetic field tangential components of the TM110- and TE111-modes (~α/λ, withλ being the wavelength) and the normal (with respect to the aperture plane) electric field component of the TM110-mode (~a/b, with b being the cavity radius). Expressions have been also derived for the coupling factor of the TM110- and TE111-modes. It is shown that the coupling coefficients determined within the accuracy up to α3 are dependent on the electric field solenoidal component on the aperture alone. In contrast to the widely used heuristic approach which is based on selection of the parameters of the chain of coupled circuits, the suggested technique provides a possibility to more accurately describe the characteristics of the axially-asymmetric oscillations in slow-wave structures and process of their excitation by high-current electron beams.
A NOVEL BISPECTRUM-BASED FREQUENCY ENCODING TECHNIQUE DEVELOPED FOR NOISY AND MULTIPATH FADING RADIO LINKS
221-239
10.1615/TelecomRadEng.v73.i3.30
P. A.
Molchanov
National Aerospace University, Chkalova Str. 17,61070, Kharkiv, Ukraine
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
A. A.
Zelensky
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov; and National Aerospace University (Kharkov Aviation Institute), 17, Chkalov St.., Kharkov, Ukraine
digital communications
signal processing
bispectrum
higher-order statistics
bit error rate
fading
In this paper, a novel encoding concept using frequency diversity strategy and bispectrum-based signal processing are suggested for wireless communication systems. According to proposed approach, binary data (0s and 1s) are transmitted by using a pair of mutually orthogonal triplet-signals contained phase coupled frequency tones. Phase coupling in each triplet-signal is given by group of three tones such that phase related to one frequency value is equal to the sum of phases related to other two frequencies. Novel third-order test statistics evaluated in the form of triplet-signal magnitude bispectrum peak values are suggested for detection and discrimination of received triplet-signals in noisy and fading communication radio links. In order to discriminate triplet-signals at the receiver, the sensitivity of bispectrum to phase coupling is exploited. Bit error rate (BER) performance assessed for additive Gaussian channel noise and fast fading demonstrates considerable gain of noise and fading protection provided by suggested bispectrum-based technique as compared with common multiple frequency shift keying (MFSK) scheme using conventional energy-based strategy for signal detection and discrimination.
ENERGY EFFICIENCY SIMULATION BASED ON VIRTUAL MIMO-BASED COOPERATIVE COMMUNICATION FOR WIRELESS SENSOR NETWORKS
241-255
10.1615/TelecomRadEng.v73.i3.40
Syed Akhtar
Imam
Department of Electronics and Communication Engineering, Faculty Of Engineering and Technology Jamia Millia Islamia, New Delhi, India
Vibhav Kumar
Sachan
Department of Electronics and Communication Engineering, KIET Group of Institutions, Ghaziabad-Meerut Highway, NH-58, Ghaziabad, Uttar Pradesh 201206, India
Wireless Sensor Network (WSN)
multiple-input multiple-output (MIMO)
energy efficiency
alamouti diversity schemes
For energy limited cooperative wireless sensor networks, an energy efficient virtual multiple input multiple output (MIMO) based communications architecture is proposed. The energy efficiencies of the proposed MIMO-based communications scheme are derived using analytical techniques while assuming a space time block coding (STBC) for the MIMO system. The communication system and the channel propagation parameters define the efficiency of the proposed system. In this paper, we investigate cooperative MIMO for fixed and variable rates. We propose energy efficient routing based on cooperative MIMO. In wireless sensors networks, the nodes are operating on batteries so that energy consumption must be minimized while satisfying given throughput and delay requirement. Simulations show that with proper design, Cooperative MIMO based routing is more energy efficient as compared to single input single output (SISO) for larger distances and prolong sensor network lifetime.
RANGING GEOSTATIONARY TELECOMMUNICATION SATELLITES WITH SATELLITE TV SIGNALS
257-269
10.1615/TelecomRadEng.v73.i3.50
F.I.
Bushuev
"Mykolayiv Astronomical Observatory" Research Institute, 1, Observatorna St., Mykolayiv, 54030, Ukraine
N.A.
Kalyuzhny
"Mykolayiv Astronomical Observatory" Research Institute, 1, Observatorna St., Mykolayiv, 54030, Ukraine
A.P.
Slivinsky
Ukrainian Institute of Radio Engineering, 238, Kirov St., Mykolayiv, 54031, Ukraine
Alexander V.
Shulga
"Mykolayiv Astronomical Observatory" Research Institute, 1, Observatorna St., Mykolayiv, 54030, Ukraine
DVB-S signal
correlation function
radio interferometer
space monitoring
A complex of radio frequency equipment and software has been developed and tested, which is intended for estimating the difference in slant ranges to geostationary telecommunication satellites through the use of correlation parameters of satellite TV signals. The signal processing that has been adopted makes account of the existing signal structure, while being independent of the information content carried by the signals. The error of estimating the difference of slant ranges is 5.6 m, which value is determined by the accuracy of hardware synchronization through the use of Resolution-T single-frequency GPS receivers. The error of orbit determination for a telecommunication geostationary satellite might be reduced to above 18 m (0.1"), should the synchronization system be improved, based on an atomic frequency standard of high stability and optimally selected spatial diversity of a few hard- and software complexes separated by about 1.000 km. The radio frequency complex discussed may become a prototype for a cost-effective all-weather regional network of facilities aimed at orbit determination and continual monitoring of orbit parameters for geostationary telecommunication satellites.
DEVELOPMENT OF 94 GHZ BWO-KLYNOTRON WITH 3-STAGE GRATING
271-281
10.1615/TelecomRadEng.v73.i3.60
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.
Kishko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
E. M.
Khutoryan
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of 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
B. P.
Yefimov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
BWO-klynotron
three-stage grating
hybrid surface-volume modes
intermode interaction
THz radiation
Three-stage slow-wave system, which allows us to provide the 94 GHz klynotron operation on hybrid surface-volume modes, is proposed to reduce the ohmic losses. Simulation results of three-stage plane gratings in 3 millimeter wave length range show the possibility of effective excitation of hybrid modes using electron beam in klynotron regime. It is shown that THz klynotron operation on hybrid surface-volume modes may substantially increase both the efficiency and the output power of the tube. The parameters of the operation of 94 GHz klynotron with the three-stage slow-wave system on hybrid surface-volume modes such as the start current value, frequency tuning range, spectral characteristics and operation mode settling time were obtained as the result of simulations.