A SYNTHESIS OF SCIENCE AND INDUSTRY AS THE SOLUTION TO THE NATIONAL PROGRAMME ON DEVELOPMENT OF THE ARCTIC ZONE OF THE RUSSIAN FEDERATION
In the conditions of the Extreme North radio communication has been and still remains the most widespread method of long-distance communication. Among the great number of modification and upgrade options for HF radio communication systems the most promising and practical one is the use of adaptive methods, which include constant channel monitoring and the use of the optimum signal-code sequence, frequency, power and signal processing algorithm at any given time. Having in mind the latest scientific achievements in radio physics, radio electronics, computer technologies, digital signal processing and programming, «RIPR» JSC has developed and continues to develop and manufacture the most advanced digital automated HF radio communication equipment, HF radio communication systems, and complexes.
Keywords: HF radio communication, radio physics, radio electronics, signal-code sequence, automated adaptive technical means complex, digital transceiver, antenna-feeder devices and systems.
THE APPLICATION OF THE INTEGRATED MODEL TO ASSESS THE EFFECTIVENESS OF CONSTRUCTING A SYSTEM OF SATELLITE COMMUNICATION
A.S. Adjemov, MTUCI, professor, Dr. Sci.(Tech.); email@example.com
E.V. Buydinov, RSCC, deputy general director of innovative development; firstname.lastname@example.org
T.A. Kuzovkova, MTUCI, professor, Dr. Sci.(Econ.); email@example.com
For making adequate management decisions on formation of systems and the appearance of satellite communications is necessary to develop methodological tools to justify the selection of an efficient option, considering the range of factors and synergies. Most of the compared indicators construction variants of satellite communication systems are not quantified or not in the form of statistical or sampled data. To account for the influence of factors at different options for the design of satellite communication systems and the existence of synergetic effect of their operation was established a system of private and General indicators, the developed model of integral estimation of effectiveness, the procedure of expert assessment of composition, the significance of the particular indices of the integral model and to assess directly the effectiveness.
Keywords: satellite communications, efficiency, integrated approach, expert technology, integrated indicator of efficiency, the choice of effective variants of the system.
ON THE CHOICE OF THE BEST SIGNAL ENSEMBLES IN THE ASYNC-ADDRESS AND COMMAND AEROSPACE SYSTEMS
V.Yu. Mikhaylov, Moscow Aviation Institute (National Research University), рrofessor, Dr. Sc. (Eng.); firstname.lastname@example.org
R.B. Mazepa, Moscow Aviation Institute (National Research University), Head of Department, Ph. D.; email@example.com
On the basis of the algebraic representation of the cross-correlation function (CCF) of maximum length codes and other algebraic code, a model and methodology of finding the best ensembles of signals when exposed to noise interference and in conditions of active radioelectronic countermeasures are proposed. The results are useful primarily to construct the isomorphic signal ensembles sets with required quality when asynchronous-address and command aerospace systems design.
Keywords: async-address systems, command systems, aerospace systems, signal ensembles, cross-correlation function.
SIMPLIFIED ALGORITHMS OF M-QAM SIGNAL IMPERFECTIONS COMPENSATION
A.V. Pestryakov, MTUCI, HoD of Radioequipment and Circuits Engineering, Dr. Sci.(Tech.); firstname.lastname@example.org
N.E. Poborchaya, MTUCI, associate professor of general communication theory chair, Ph.D.; email@example.com
E.R. Khasianova, MTUCI, junior research fellow, post-graduate; firstname.lastname@example.org
The estimation of QAM signal parameters at the output of quadrature downconverter with further compensation of the distortions in the presence of Additive White Gaussian Noise and Phase Noise were investigated in this paper. I/Q-imbalance, DC-offset, frequency offset remaining after the downconversion and phase deviation of the signal due to the transmitter and receiver delays, were estimated in the article. The problem was solved by using of simplified nonlinear filtering algorithm, a simplified variational algorithm and the statistical averaging method.
Keywords: Quadrature Amplitude Modulation, I/Q-imbalance, DC-offset, nonlinear filtering, variational algorithm, statistical averaging.
SYNTHESIS OF CHANNEL PRECODER FOR DIGITAL COMMUNICATION SYSTEMS WITH FINITE ORTHOGONAL SIGNAL BASES
V.P. Volchkov, MTUCI, professor of department «General theory of communication», Ph.D.; email@example.com
V.G. Sannikov, MTUCI, professor of department «General theory of communication», Ph.D.; firstname.lastname@example.org
The mathematical formalization of the synthesis of optimal channel precoder for digital communication systems with Nyquist symbol-by-symbol multiplexing is presented. The solution of this problem is given by the method of variational calculus and formulated the conditions under which this decision leads to a finite orthogonal signal bases. The results of computational experiment, confirming the good properties of the obtained bases is presented.
Keywords: digital communication system, frequency-selective channel, multipath channel, intersymbol interference, channel precoder, finite signal bases, symbol-by-symbol multiplexing, variational method of synthesis, optimal pre-emphasis.
METHODS ENSURE SYNCHRONOUS OPERATION OF TV TRANSMITTERS NETWORK SFN STANDARDS DVB-T2 AND DVB-T
V.L. Karyakin, Povolzhskiy State University of Telecommunications & Informatics, professor department of radio communication, radio broadcasting and television, Dr. Sci.(Tech.); email@example.com
D.V. Karyakin, The Russian representation of Juniper Networks (Moscow), senior systems engineer, Ph.D.; firstname.lastname@example.org
L.A. Morozova, Povolzhskiy State University of Telecommunications & Informatics, department of Economics and production, associate professor, Ph.D.; email@example.com
The analysis presented significant differences in the technologies of formation of MPEG-2TS and T2-MI streams, in the methods of setting single-frequency networks of the first and second generations, providing synchronous operation of transmitters in accordance with international standards of digital broadcasting.
Keywords: SFN network, standards, DVB-T, DVB-T2, streams MPEG-2TS and T2-MI, synchronization of transmitters, timestamps.
СOMPUTING RESOURCES OPTIMIZATION OF THE URBAN MULTIPATH FADING CHANEL SIMULATOR
This paper presents method of computing resources optimization of the real-time multipath fading channel simulator. This method reduces computing complexity of simulator and allows implementing it on existing hardware (e.g. field-programmable gate arrays). The optimization criterion is also proposed.
Keywords: multipath fading channel, multipath fading channel simulator, field-programmable gate array.
THE WAY AND DEVICE REDUCING NONISOCHRONISM VOLTAGE CONTROLLED OSCILLATOR WITH VARICAP
M.P. Savchenko, Immanuil Kant Baltic Federal University, head of the telecommunications department, Ph.D.; firstname.lastname@example.org
O.V. Starovoitova, Immanuil Kant Baltic Federal University, senior teacher of the telecommunications department; email@example.com
A method for reducing nonisochronism oscillator controlled varicap by automatic correction of the bias voltage on the varicap. An expression relating the amplitude of the oscillations of the generator with a voltage correction, experimentally confirmed the high efficiency of the process. It is presented block diagram of an automatic voltage correction.
Keywords : nonisochronism, stabilizer of frequency oscillator, voltage controlled oscillator, varicap.
ANALYSIS OF AM-PM DISTORTION PHENOMENA IN HIGH-EFFICIENCY PA APPLICATIONS
A.V. Smirnov, MTUCI, post-graduate; firstname.lastname@example.org
The AM-PM distortion phenomena is studied using the state-variable analysis technique and resorting to computer simulations. Conditions which imply the possibility to equally represent the general-form nonlinear PA distortion operator with a couple of AM-AM and AM-PM functions are approached as well as conditions which allow to neglect AM-PM distortion phenomena. The AM-AM and AM-PM functions derived by the semi-analytic method are compared to those that are obtained via SPICE simulation routine.
Keywords: PA nonlinearity, AM-AM and AM-PM distortion, state-variable analysis, SPICE modeling.
MOBILE NETWORKS ECOLOGY ADAPTATION BASED ON THE OPERATIONAL ELECTROMAGNETIC FIELD MONITORING
Operational electromagnetic filed monitoring system is described, based on which cellular networks can be adapted to our environment according to the criteria’s of electromagnetic safety. Ecological compatibility, reliability and safety are the new concepts and criteria’s of future networks rollout. Structure and input data is discussed, questions of network planning tools usage are raised, propagation models comparison is discussed and calculations are done. GIS is used for results post processing and visualization.
Keywords: оperational electromagnetic field monitoring system, cellular network, Ecological compatibility, network planning tools, propagation model.