Items of № 12, 2020

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ASSESSMENT OF ISOLATION BETWEEN RECEIVING AND TRANSMITTING ANTENNAS IN FULL DUPLEX COMMUNICATION SYSTEMS

Keywords: full duplex, spectral efficiency of communication systems, antennas, antenna isolation, Huygens-Fresnel principle.

A method of calculating the isolation between antennas is presented and the distances by which they must be separated are determined so that the isolation between the transmitting and receiving paths has the maximum possible value. It is noted that when building full duplex communication systems it is impractical to use separate antennas for transmitting and receiving signals. It makes more sense to use one transmitting and receiving antenna in such systems and install special technical devices directly in the antenna-feeder path to separate the transmitted and received signals. The paper also presents formulas that allow us to estimate the isolation between the transmitting and receiving antennas depending on (i) the distance between them, (ii) the frequency used for transmitting and receiving signals, as well as (iii) the antenna gain. The corresponding calculation results are also presented. The results obtained can be used to improve the spectral efficiency of communication systems.

ESTIMATION OF THE HEAD-END MOVEMENT SPEED IN A HETEROGENEOUS WIRELESS SENSOR NETWORK WITH MOBILE HEAD-ENDS

  • D.M. Vorobiova, Saint-Petersburg State University of Telecommunications (SPbSUT), department of communication networks and data transmission (CN&DT), postgraduate; da_shutka@mail.ru
  • A.I. Paramonov, SPbSUT, department of CN&DT, professor, Dr.Sci.(Tech.); alex-in-spb@yandex.ru
  • A.E. Koucheryavy, SPbSUT, head of the department of CN&DT, professor, Dr.Sci.(Tech.); akouch@mail.ru

Keywords: wireless sensor network, heterogeneous network, mobile head-ends, quality of service, QoS, motion speed.

The paper deals with a heterogeneous sensor network built using various technologies. Heterogeneous mobile headends are used to collect data in the network. The paper proposes a network model and a method that allows you to choose the optimal speed of movement of the head-ends, taking into the communication radius and the time required for data transmission from the sensor node. Expressions are obtained for estimating the optimal speed of movement of the head-ends both for each of the types of nodes and for a heterogeneous network as a whole. The results allowing us to choose the parameters of movement of the mobile head-ends and assess the quality of service are obtained.

METHODS FOR DETERMINING THE DYNAMIC ALLOCATION OF SERVICE POINTS AND TRAFFIC PREDICTION FOR ULTRA-LOW LATENCY NETWORKS

  • N.A. Chistova, Saint-Petersburg State University of Telecommunications, department of communication networks and data transmission, postgraduate; chistova.na@spbgut.ru

Keywords: tactile Internet, augmented reality, virtual reality, traffic, delay, control and teleautomatics systems, energy distribution, service points.

Methods for determining the dynamic allocation of service points (data centers) and traffic prediction for ultra-low latency networks are proposed. Statistical data, expert assessments, and empirical forecasts were used for the development of the traffic prediction method. The methods are built taking into account the penetration of the most popular and promising telecommunication services in the ultra-low latency networks, as well as changes in the number of users and the amount of specific user traffic.

DEVELOPMENT OF A FOUR-CHANNEL COHERENT SDR TRANSCEIVER FOR MEASURING THE PARAMETERS OF TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM

Keywords: FPGA, TCAS, automating, measure, PXI, measuring stand, hardware-software modeling, software-defined radio.

An assessment of the relevance of checking the functioning of airborne traffic collision avoidance systems (TCAS) at the stages of their life cycle under the guidelines ARP 4754, DO-254, and DO-178C is given. The disadvantages of highly specialized systems currently used for these purposes are shown. It is concluded that it is necessary to develop a universal toolkit that allows checking TCAS in accordance with ARP 4754, DO-254, and DO-178C, as well as carrying out their certification under the requirements DO-185. The possibility of creating a universal automated measuring stand by the development and use in its composition a four-channel coherent transceiver based on the technology of virtual devices and software-defined radio based on FPGA is considered.

MY DIGITAL TWIN

  • V.A. Efimushkin, Analytical Center for the Government of the Russian Federation, lead advisor, International Telecommunication Academy, chief scientific secretary, associate professor, Ph.D.; v.efimushkin@ac.gov.ru

Keywords: cross-cutting digital technology, digital twin, personal digital twin, virtual reality, augmented reality, artificial intelligence, knowledge base, cloud technology, wearable network, mobile phone network.

A new, yet unexplored area of application of cross-cutting digital technologies of virtual and augmented reality, neurotechnologies, and artificial intelligence based on cloud technologies, big data, blockchain, and quantum computing technologies is proposed: the creation of a personal (PDT) and production digital twin (PrDT) with a varied and deep selflearning functionality to improve human life during work, rest, travel, specific activities, etc. The basic aspects of creating a PDT, its applications, architecture, and functional architecture of the PDT platform, types of requests, and scenarios of their processing are considered. An approach to the construction of analytical models of PDT in the form of graph-matrix models, as well as to their calculation is analyzed. A forecast of further development of the PDT applications is given.

SMART CHAINS IN DIGITAL PACKAGING

  • V.K. Shultseva, Primakov National Research Institute of World Economy and International Relations of the Russian Academy of Sciences, senior research fellow; vshul@imemo.ru

Keywords: digitalization, technologies, innovation, economics, global value-added chains, ICT complex, hi-tech.

The ICT industry is considered as one of the most important tools of global cooperation and effective transformation of the world economy in terms of the features of the formation and development of digital, or smart, value-added chains in the pre-crisis period. Possible evolutionary changes in the situation in the ICT industry in the near future are shown.

DIFFERENTIAL PHASE DIRECTION FINDING ERRORS FOR EMITTERS WITH PHASE-ANGLE DEPENDENCE

  • V.N. Yudin, Moscow Aviation Institute (MAI), department of theoretical radio engineering, professor, Dr.Sci.(Tech.); vn_yudin@mail.ru
  • A.M. Volkov, MAI, department of theoretical radio engineering, postgraduate; afv92@yandex.ru

Keywords: phase direction finder, phase difference bearing error, phase-angle dependence.

Formula relations for calculating the direction finding errors of a paired transmitter using a phase difference direction finder are derived. The influence of various parameters of a paired radiator on the magnitude of the direction finding error of this radiator is estimated.

ANALYSIS OF THE PROCESS OF SELF-SIMILARITY OF NETWORK TRAFFIC AS AN APPROACH TO DETECTING CYBER ATTACKS ON COMPUTER NETWORKS

  • I.V. Kotenko, St. Petersburg Federal Research Center of the Russian Academy of Sciences (SPC RAS), head of the laboratory of computer security problems, Dr.Sci.(Tech.), professor; ivkote@comsec.spb.ru
  • A.M. Kribel, S.M. Budyonny Military Academy of Communications, applicant; nemo4ka74@gmail.com
  • O.S. Lauta, Admiral Makarov State University of Maritime and Inland Shipping, professor, Dr.Sci.(Tech.); laos-82@yandex.ru
  • I.B. Saenko, SPC RAS, leading researcher, professor, Dr.Sci.(Tech.); ibsaen@comsec.spb.ru

Keywords: cybersecurity, computer networks, anomaly detection, cyber attacks, time series, fractal analysis, Hurst metric, scaling metric.

The paper discusses an approach to detecting cyber attacks on computer networks, based on identifying anomalies in network traffic by assessing its self-similarity property. Methods for identifying long-term dependence in fractal Brownian motion and real network traffic of computer networks are considered. It is shown that the traffic of a telecommunication network is a self-similar structure and its behavior is close to fractal Brownian motion. Fractal analysis and mathematical statistics were used as tools in the development of this approach. The issues of the software implementation of the proposed approach and the formation of a data set containing network packets of computer networks are considered. The experimental results obtained using the generated dataset demonstrated the existence of selfsimilarity in the network traffic of computer networks and confirmed the fair efficiency of the proposed approach. The proposed can be used to quickly detect cyber attacks in real or near real time.

ADAPTATION OF SOLID MODELS FOR SOLVING HEAT ENGINEERING PROBLEMS USING CAD CALCULATION MODULES

  • A.I. Repneva, Moscow Aviation Institute (MAI), department 404, assistance lecturer, Ph.D.; dckaf_404@mail.ru
  • V.N. Postnikova, MAI, department 404, associate professor, senior
    research fellow, Ph.D.; vpost16@yandex.ru

Keywords: CAD, solid model, aerodynamic modeling, labor intensity, finite-volume method, efficiency, economy, electronic devices.

The main disadvantages of traditional approaches to solving thermal engineering problems by means of aerodynamic modeling using a computer for solid models are shown. The ways of increasing efficiency and reducing the labor intensity of such calculations due to the method of step-by-step simplification (adaptation) of solid geometry are determined. Cost savings of system resources and machine time were estimated using the technique of step-by-step simplification of a solid geometry. The possibility of calculating more complex models with limited hardware resources was revealed due to the proposed approach.

GENERATION OF A PROBABILISTIC MODEL OF CYCLOSTATIONARY SIGNALS IN TRANSMISSION LINES OF ELECTRONIC DEVICES

  • M.A. Konovalyuk, Moscow Aviation Institute (MAI), theoretical radio engineering department, associate professor, Ph.D.; konovaluk@mai-trt.ru
  • A.B. Baev, MAI, theoretical radio engineering department, associate professor, Ph.D.; baev@mai-trt.ru
  • A.A. Gorbunova, MAI, theoretical radio engineering department, associate professor, Ph.D.; gorbunova@mai-trt.ru
  • Y.V. Kuznetsov, MAI, the head of the theoretical radio engineering department, professor, Dr.Sci.(Tech.); kuznetsov@mai-trt.ru

Keywords: PAM signal, cyclostationary random process, crosstalk noise, probabilistic model, signal integrity, electromagnetic interference, electromagnetic compatibility.

When assessing the integrity of information signals transmitted on high-speed transmission lines, it is necessary to use probabilistic models of random processes. In existing computer-aided design systems, simulation is carried out for a finite number of signal realizations, which limits the prediction capabilities. During compliance tests of electronic devices test pseudo-random sequences of finite length are used. Controlled levels of probabilities can be less than 10−12. In such cases, the software functions provide an estimation of the parameters of probabilistic models for measurement equipment. The existing models do not allow to compensate for interference caused by electromagnetic crosstalk noise. In this paper, the model of two-dimensional probability densities of the measured signals and interference is introduced. This model combined with well-known methods of principal and independent components will allow compensating for the distortion of the useful signal due to interference.

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