RUSSIAN MARKET OF PROFESSIONAL MOBILE RADIO AND CRITICAL COMMUNICATIONS: CURRENT STATE, PROBLEMS, PROSPECTS
- O.A. Shorin, LLC NSTT, general director, professor, Dr.Sci.(Tech.);
oshorin@nxtt.org - R.Yu. Kaspari, LLC NSTT, marketing director; roman.kaspari@nxtt.org
Keywords: professional mobile radio, critical voice, critical data, McWiLL.
The characteristics and audience of professional mobile radio and critical communication networks are reviewed. The analysis of professional mobile radio technologies used in Russia and the prospects for the development of this segment of the telecommunications market is carried out, as well as its volume is estimated in the five-year perspective. It is shown that McWiLL broadband professional radio communication technology not only solves the urgent problems associated with the modernization of morally and physically obsolete systems of departmental and corporate trunking communications, but also opens up new opportunities for the growth of the market for critical information transmission services.
ENSURING THE SECURITY OF PROFESSIONAL RADIO COMMUNICATION SYSTEMS IN CRITICAL INFORMATION STRUCTURES
- G.O. Bokk, LLC NSTT, director of research, Dr.Sci.(Tech.); bookg@yandex.ru
- A.O. Shorin, LLC NSTT, technical director, Ph. D.; as@nxtt.org
Keywords: SoC chip, unauthorized impacts, peripherals, 5G, open system model X.200.
Some existing and expected in the near future scenarios of unauthorized impacts on communication systems in critical information structures are considered. It is demonstrated that the area of increased risk of nauthorized impacts is focused on the interfaces between the peripheral devices and the SoC chip. Several examples of organizing multiple subscriber terminals into groups operating under a single program of unauthorized influence, in which the level of penetration can increase many times, are given. It is noted that such opportunities are real in the transition to 5G generation systems, which assume the M2M mode of operation.
SYNCHRONIZATION IN TIME-DUPLEX RADIO SYSTEMS
- G.O. Bokk, LLC NSTT, director of research, Dr.Sci.(Tech.); bookg@yandex.ru
- R.S. Averyanov, LLC NSTT, production director; ars@nxtt.org
Keywords: synchronization algorithm, OFDM, TDD, mobile radio networks, maximum likelihood criterion, multipath propagation.
Operation in synchronization mode of the McWiLL standard communication system, using the organization of radio communication with time duplex, is considered. A basic version of the optimal algorithm for processing single synchronization measurements is obtained, which is focused on working in a channel with white Gaussian noise at unknown but stable spectral distortions of the signal. Based on the developed algorithm, many variants of statistical accumulation of measurements for the synchronization mode in non-stationary conditions are proposed. Using multipath propagation models approved by international recommendations, the best variants of synchronization algorithms with accumulation are identified.
HANDOVER ALGORITHM OF THE McWiLL SYSTEM IN THE MODE OF RADIO CHANNEL RESOURCE ALLOCATION CONFLICT ELIMINATION
- R.S. Averyanov, LLC NSTT, production director; ars@nxtt.org
Keywords: adaptive antenna array, base station, conflict-free resource allocation, spatial selection, cross-correlation, reference signals.
The McWiLL system handover mode, designed to eliminate conflicts in the distribution of radio channel resources, focused on the spatial selection of radio signals of subscribers of neighboring base stations, carried out by 8-element adaptive antenna arrays, is considered. An algorithm for ontrolling the adaptive antenna arrays of base stations, focused on eliminating conflicts at maximum loads, is described. The description of the spatial selection algorithm, focused on conditions of the possible absence of line-of-sight traces and, as a result, arbitrary laws of the amplitude-phase distributions of the fields on antennas, is given. A numerical relationship is
established between the energy reserve at the edges of the service areas and the equivalent angular distance between subscribers, sufficient for conflict-free spatial separation of identical spectral-time resources. It is shown that the input of a controlled delay parameter in the synchronization mode will allow the implementation of spatial separation of subscribers served by a single base station in the McWiLL system.
INTERFERENCE RESISTANCE OF THE McWiLL SYSTEM
- O.A. Shorin, LLC NSTT, general director, professor, Dr.Sci.(Tech.); oshorin@nxtt.org
- G.O. Bokk, LLC NSTT, director of research, Dr.Sci.(Tech.); bookg@yandex.ru
Keywords: interference resistance, OFDM, mobile radio networks, maximum posterior probability, multipath propagation.
Problems of interference resistance of algorithms of digital processing of received signals for the McWiLL communication system are considered. Particular attention is paid to the correction of the amplitude-frequency and phase-frequency distortions of the radio channel in conditions of extremely low signal-to-noise ratios. The potential for improving the sensitivity index for multipath signal propagation is assessed. The best algorithms are identified. It is established that for the frequency range of 340 MHz McWiLL system subscribers moving at speeds up to 6 m/s can be perceived as stationary when considering the interference resistance issues.
5G NETWORK EFFICIENCY IMPROVEMENT — GLOBAL RESEARCH COMPETITION
- E.E. Devyatkin, FSUE NIIR, EMC Analysis Center, deputy director, Ph.D.(Econ.); edevyatkin@niir.ru
- M.V. Ivankovich, FSUE NIIR, EMC Analysis Center, deputy head of a department, Ph.D.; m.ivankovich@niir.ru
- G.S. Bochechka, FSUE NIIR, communications and broadcasting systems engineer, Ph.D.; g.bochechka@niir.ru
- I.V. Kuznetsov, FSUE NIIR, communications and broadcasting systems engineer; i.kuznetsov@niir.ru
Keywords: 5G, patents, SC-FDMA, DFT-s-OFDM, CP-OFDM, FBMC, UFMC, GFDM, F-OFDM, massive MIMO, multi-user MIMO, single-user MIMO, beamforming.
It is shown that the development of new signal generation and processing methods for 5G and 6G systems is one of the key challenges for researchers and developers around the world. The paper considers proprietary technical solutions that improve the efficiency of modulation, spatial coding and signal multiplexing methods used in 5G systems. The dynamics of patent activity, the geography of inventions, key researchers, and their patent strategies are analyzed.
A SURVEY OF MODERN TECHNIQUES OF ERROR CORRECTION CODING
- P.V. Trifonov, ITMO University, head of the Information and Coding Theory laboratory, professor, IEEE Transactions on Communications, editor, Dr.Sci.(Tech.); pvtrifonov@itmo.ru
- B.D. Kudryashov, ITMO University, professor, Dr.Sci.(Tech.); bdkudryashov@itmo.ru
- V.D. Miloslavskaya, The University of Sydney, School of Electrical and Information Engineering, postdoctoral research associate in telecommunications, Ph.D.; vera.miloslavskaya@sydney.edu.au
Keywords: channel coding, polar codes, BCH codes, storage systems.
The paper discusses error correction coding techniques used in modern communication and storage systems. A brief survey of code constructions, decoding algorithms, and achievable performance and complexity is presented. The principal advantages and drawbacks of the considered techniques, as well as some further research directions, are outlined.
MODELING A DECAMETER RADIO LINK IN PREDICTING THE RELIABILITY OF COMMUNICATION
- N.N. Semerkov, JSC Russian Institute of Powerful Radio Engineering, leading researcher, Ph.D.(Mil.); vh77@mail.ru
Keywords: decameter radio communication, short-wave radio communication, HF, high-frequency communication, HF, decameter radio link, communication reliability, antenna parameters.
A brief description of the sequence of calculation of communication reliability in the decameter wave range is presented. It includes several methods and models for determining the characteristics of radio wave propagation conditions and technical parameters of radio link elements. A feature of the proposed decameter radio line model is the system construction of methods and algorithms for determining radio line parameters for a single problem of predicting radio communication conditions, which aims to create an adaptive radio line of a new type — taking into account the parameters of changes in a geomagnetic disturbance.
