Volume 4, Number 1 (2018)
A.V. Pestryakov, I.I. Kolesnikov
DIGITAL REALIZATION OF ANALOGUE FREQUENCY MODULATION (pp. 2-5)
M.P. Savchenko, O.V. Starovoitova
REDUCING THE PHASE NOISE OF THE AUTO GENERATOR WITH VARICAPES BY USING THE NEGATIVE FEEDBACK CHAIN BY NOISE (pp. 6-11)
MODELING OFDM SIGNAL DISTORTION IN A NON-LINEAR AMPLIFIER WITH MEMORY EFFECTS (pp. 12-17)
M.S. Tokar, A. Makarevich
DIFFERENTIAL SPATIO-TEMPORARY BLOCK CODES IN MODERN MULTI-ANTENNA RADIO COMMUNICATION SYSTEMS (pp. 18-24)
A.B. Gerasimov, A.N. Krenev, E.A. Selyanskaya, D.M. Soloviev, V.E. Turov
SEMI-NATURAL MODELING OF THE DYNAMIC FIELD OF ELECTROMAGNETIC SIGNALS (pp. 25-29)
CONSTRUCTION OF A COMBINED ADAPTIVE ECHO COMPENSATION ALGORITHM WITH REDUCED COMPUTATIONAL COMPLEXITY (pp. 30-34)
N.L. Biryukov, N.R. Triska
PLESIOCHRONOUS MODE IN PACKET NETWORKS (pp. 35-40)
ABSTRACTS & REFERENCES
DIGITAL REALIZATION OF ANALOGUE FREQUENCY MODULATION
A.V. Pestryakov, I.I. Kolesnikov,
Moscow Technical University of Communications and Informatics , Moscow, Russia
Existing methods of a digital FM forming for a sound broadcasting (using direct digital synthesizers) have a number of disadvantages: structural complexity and consequently high cost, complex filtration of unwanted components due to the digital signal processing. This article describes method of these disadvantages eliminating.
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REDUCING THE PHASE NOISE OF THE AUTO GENERATOR WITH VARICAPES BY USING THE NEGATIVE FEEDBACK CHAIN BY NOISE
To reduce the phase noise of the oscillator, controlled by the frequency of the varicaps, it is proposed to introduce a negative noise feedback circuit that compensates for the influence of amplitude fluctuations on the value of the capacitance of the varicaps and thereby reduces phase noise.
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MODELING OFDM SIGNAL DISTORTION IN A NON-LINEAR AMPLIFIER WITH MEMORY EFFECTS
A.V. Smirnov, email@example.com,
Moscow Technical University of Communications and Informatics, Moscow, Russia
An approach to modeling nonlinear effects that occur when an OFDM signal is amplified in a radio frequency power amplifier is presented. The use of a simplified circuit model of the amplifier is proposed, which, in accordance with the method of state variables, is described using a system of homogeneous differential equations. Such a model makes it possible to take into account the presence of such nonlinear effects as amplitude-phase conversion and inertia of distortions (or memory effect). By numerically integrating the state system for the input exposure represented by the implementation of the OFDM signal of the 3GPP LTE standard, we study such key indicators of related nonlinear effects as the degree of AM-AM and AM-PM distortion of the low-frequency equivalent of the signal and the degree of expansion of its frequency spectrum. The results are presented regarding the compensation efficiency of nonlinear amplification effects using the inertialess method of digital signal predistortion.
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3. Smirnov, A.V. New applications of the nonlinear power amplifier model. T-Comm. 2015. No. 9, pp. 76-84.
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DIFFERENTIAL SPATIO-TEMPORARY BLOCK CODES IN MODERN MULTI-ANTENNA RADIO COMMUNICATION SYSTEMS
The article is devoted to the performance evaluation of differential space-time block coding (DSTBC). The coding scheme is based on the use of Multiple Input Multiple Output (MIMO) technology and the principle of relative phase modulation, when using which there is no need to know the information about the state of the communication channel by the receiver with some minor assumptions. The encoding / decoding scheme was simulated in the MATLAB software package for a different number of antennas on the transmitting and receiving sides.
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SEMI-NATURAL MODELING OF THE DYNAMIC FIELD OF ELECTROMAGNETIC SIGNALS
A.B. Gerasimov, firstname.lastname@example.org,
A.N. Krenev, email@example.com,
E.A. Selyanskaya, firstname.lastname@example.org,
D.M. Soloviev, email@example.com,
V.E. Turov, firstname.lastname@example.org,
Yaroslavl State University named after P.G. Demidov, Yaroslavl, Russia
The semi-natural modeling of dynamic half-signals by a simulator of the electromagnetic environment is based on the method of generating useful and interfering signals with controlled parameters using the semi-natural model of the radio electronic equipment, a booster computer and a set of generators.
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CONSTRUCTION OF A COMBINED ADAPTIVE ECHO COMPENSATION ALGORITHM WITH REDUCED COMPUTATIONAL COMPLEXITY
A.N. Tarakanov, email@example.com,
Yaroslavl State University P.G. Demidov, Yaroslavl, Russia
The aim of this study is to develop a combined adaptive algorithm with reduced computational complexity based on the Recursive Least Squares Method and the Normalized Least Squares Method.
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PLESIOCHRONOUS MODE IN PACKET NETWORKS
N.L. Biryukov, N.R. Triska, firstname.lastname@example.org,
Telecommunication Systems Institute of “KPI”;
National University, Ukrainian Scientific Research Institute of Telecommunications, Kyiv, Ukraine
The perspectives of using of a plesiochronous network model for evaluating of timing and performance characteristics in packet networks are discussed. The problems for further study are outlined.
1. Biryukov N.L. Synchronization of transport technologies in the transition to NGN. Telecommunications. 2009. No. 10, pp. 30-35.
2. Ferrant J.-L., Ruffini S. Evolution of the standards for Packet Network Synchronization. IEEE Communication Magazine. February 2011.
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4. Biryukov N.L., Triska N.R. Probabilistic analysis of information transfer in the plesiochronous network. Infocommunications – present and future: materials of the fourth intern. scientific-ex. Conf. Odessa 2014. Part 1, pp. 115-119.