Items of № 2-2025

The main problems of the underwater acoustic communication channel

I.S. Pavlov, Novosibirsk State University of Architecture and Civil Engineering (Sibstrin), department of information systems and technology, associate professor, Ph.D.; iipavlov02@mail.ru

M.S. Pavlova, SibSUTIS, department of radio engineering devices and technosphere security, associate professor, Ph.D.; mspavlova-85@ mail.ru

E.S. Abramova, SibSUTIS, department of radio engineering devices and technosphere security, professor, Dr.Sci.(Tech.); evgenka_252@mail.ru

S.S. Abramov, SibSUTIS, department of professor of radio engineering devices and technosphere security department, professor, Dr.Sci.(Tech.); abramov@sibguti.ru

UDC 621.396.623

DOI: 10.34832/ELSV.2025.64.2.001

Abstract. The reasons that can affect the quality of the transmitted acoustic signal during the design and modeling of the underwater acoustic communication channel are considered. As a result of the analysis, it was found that the main problems in organizing an underwater acoustic communication system are surface waves, internal turbulence, changes in density, salinity, or water pressure, and many other small-scale phenomena. All of these lead to propagation delays, loss of information transmission, noise, multipath propagation, and relative Doppler bias.

Keywords: underwater acoustic communication channel; propagation delay; loss of information transmission; noises; multipath; Doppler effect.

Mobile number transfer service. Arbitration as a means of improving the quality of MNP services

V.О. Risman, The M.I. Krivosheev National Research Centre for Telecommunication (NRCT), deputy general director; rismanvo@nic-t.ru

M.Yu. Kutepov, NRCT, director of SIT; kutepovmy@nic-t.ru

I.A. Bukharev, NRCT, head of research center; buharevia@nic-t.ru

E.B. Kuptsova, NRCT, deputy head of research center; kupcovaeb@nic-t.ru

UDC 621.391

DOI: 10.34832/ELSV.2025.64.2.002

Abstract. The article describes measures aimed at reducing failures in transferring subscriber numbers. One of these measures is for the operator of the database of transferred subscriber numbers to verify information about the subscriber received from the recipient operator with similar information received from the donor operator, the socalled Arbitration. The procedure for conducting Arbitration is described, as well as the actions of telecom operators based on its results.

Keywords: MNP service, database of transferred numbers, NPDB, failure codes, Arbitration.

Model of optimal channel formation in flexible optical communication networks

A.P. Boyko, S.M. Budyonny’s Military Academy of Communications, department of communication networks and switching systems, doctoral student, associate professor, Ph.D.; varenyxa89@gmail.com

S.M. Odoevsky, St. Petersburg State Marine Technical University, department of automatic control systems and on-board computer engineering, professor, Dr.Sci.(Tech.); odse2017@mail.ru

S.A. Yasinsky, CJSC “Institute of Telecommunications”, leading specialist, associate professor, Dr.Sci.(Tech.); yasinsky777@mail.ru

UDC 621.395.741

DOI: 10.34832/ELSV.2025.64.2.003

Abstract. The model of channel formation presented in the paper allows to take into account the peculiarities of frequency planning in flexible optical networks when forming the total transmission rate between correspondent nodes. The interrelation between the involved spectral resource and nominal transmission rates in spectral channels formed on the basis of light paths is established. Variants of target functions are presented that allow, on the basis of the proposed model, to solve optimization problems aimed at minimizing the used spectral resource of the network under conditions of restrictions on the number of optical interfaces and the bandwidth of fiber-optic communication lines. Examples of formalized formulation and solution of optimization problems on the basis of the proposed model using methods of integer linear programming, dynamic programming, and derivative functions are given.

Keywords: flexible optical communication networks, channel formation, spectral resource, optimization.

An engineering approach to the calculation of queueing systems

A.V. Bogdanov, Nateks Group of Companies, engineer, Ph.D.; alexbogy1972@yandex.ru

UDC 519.872

DOI: 10.34832/ELSV.2025.64.2.004

Abstract. The article presents a simplified methodology for the computation of queueing systems, obtained by proving the invariance of the Erlang distribution for a general kind of message service time distribution. The simplified recurrence formulas required for the computation of queueing systems with losses and with waiting and losses allow us to formalize the description of queueing systems, which can then be easily implemented in any computer algebra system. The proposed additional simplifications allow for an acceptable computation time of queueing systems with a controlled amount of computation error. The obtained results can be used for preliminary quality assessment of various variants of queueing systems.

Keywords: Erlang distribution, queueing system, distribution, losses, expectation and losses.

Digital twins as the basis of a new paradigm of infocommunications management

B.S. Goldstein, RТС ARGUS, deputy director general for science, Dr.Sci.(Tech.); bgold@niits.ru

S.V. Kislyakov,The Bonch-Bruevich Saint-Petersburg State University of Telecommunications, associate professor, RТС ARGUS, business-analyst, Ph.D.; kislyakov@sut.ru

UDC 654.1

DOI: 10.34832/ELSV.2025.64.2.005

Abstract. The digital twin technology as a new paradigm of operational management of post-NGN networks is discussed. The approach of building a digital twin of the Network Resource Inventory system of the telecom operator’s network resources is proposed.

Keywords: digital twin, infocommunication management, open digital architecture, OSS/BSS, communication network.

An object classification algorithm based on complex data processing of the ground-based robotic complex vision system

D.N. Bezumnov, Moscow Technical University of Communications and Informatics (MTUCI), senior lecturer; d.n.bezumnov@mtuci.ru

D.S. Chirov, MTUCI, head of department, professor, Dr.Sci.(Tech.); d.s.chirov@mtuci.ru

M.V. Bazylev, MTUCI, associate professor, Ph.D.; m.v.bazylev@mtuci.ru

UDC 004.89

DOI: 10.34832/ELSV.2025.64.2.006

Abstract. The article presents the results of a study on improving the efficiency of vision systems of ground-based robotic complexes. It is proposed to use the integration of optical and radar channel information at the solution level to increase the probability of correct classification of objects in the field of view of the vision system. Classification (recognition) of objects is performed in each of the channels independently, using a convolutional neural network. Obtaining a comprehensive assessment of the classification of objects is carried out according to the Shortliff scheme. The simulation results showed that the proposed algorithm makes it possible to increase the efficiency of the vision system of the robotic complex by 43% compared with using only the optical channel and by 38% compared with using only the radar channel.

Keywords: robotics complex, vision system, object classification, convolutional neural network, optical and radar images.

Experimental measurement of 5G/IMT-2020 coverage in 3400–3800 and 6425–7125 MHz

A.S. Pastukh, The M.I. Krivosheev National Research Centre for Telecommunication (NRCT), head of laboratory; apastukh@lenta.ru

A.A. Mochenov, NRCT, head of laboratory; mochenovaa@niir.ru

E.E. Devyatkin, NRCT, director of Advanced Wireless Communication Technologies Research Center, Ph.D.; edevyatkin@niir.ru

M.V. Ivankovich, NRCT, deputy director of Advanced Wireless Communication Technologies Research Center, Ph.D.; ivankovichmv@niir.ru

UDC 621.396

DOI: 10.34832/ELSV.2025.64.2.007

Abstract. The article presents the results of field tests, including measurements of peak speed and network coverage for 5G NR in the 3400–3800 MHz and 6425–7125 MHz frequency bands. The tests include uplink and downlink scenarios under both line-of-sight (LOS) and non-line-of-sight (NLOS) conditions. In the 6425–7125 MHz band, four-carrier aggregation was tested, with each carrier having a bandwidth of 100 MHz, and peak throughput values were analyzed. The study compares coverage and data transfer speeds across the tested frequency bands. The findings provide insights into the feasibility of integrating the 6425–7125 MHz band into 5G/IMT-2020 infrastructure and its potential role in the evolution toward 6G/IMT-2030.

Keywords: 5G NR, IMT, 6 GHz, 3.5 GHz, carrier aggregation, network coverage, network bandwidth.

Formation and analysis of stereophonic broadcasting signals with polar modulation using modern measuring instruments. Part II

N.V. Lemeshko, JSC Corporation Cometa, head of department, Dr.Sci.(Tech.); nlem83@mail.ru

S.S. Zaharova, High School of Economics, teacher, Ph.D.; ZaharovaSvetlana@yandex.ru

UDC 535.131

DOI: 10.34832/ELSV.2025.64.2.008

Abstract.The article is devoted to the issues of formation and analysis of polar modulation stereophonic broadcasting signals. Based on the information on the procedure for implementing polar modulation, it proposes an algorithm for restoring modulating dependencies, intended for estimating the quality of operation of devices that generate polar modulation signals. In Part II of the article, an algorithm for post-processing signals with polar modulation by samples is proposed; its characteristics are substantiated. The results of the software development of the algorithm, obtained on the basis of calculated values of samples of signals with polar modulation and confirming its effectiveness, are presented. Information is presented on the error that occurs when processing signals using the proposed algorithm.

Keywords: polar modulation, subcarrier, complex stereo signal, mathematical model, postprocessing, demodulation, measurement method, sampling.

Construction of optimal algebraic codes for error protection in digital data transmission systems

A.A. Pavlov, branch of the Military Academy of Strategic Missile Forces named after Peter the Great (MA SMF), professor, Dr.Sci.(Tech.); Pavlov_iif@mail.ru

A.N. Tsarkov, Autonomous Non-Profit Organization (ANPO) “Institute of Engineering Physics”, chairman of the board, professor, Dr.Sci.(Tech.); info@iifrf.ru

Yu.A. Romanenko, branch of the MA SMF, leading researcher, Dr.Sci.(Tech.); Romanenko-55@inbox.ru

O.F. Pashaev, branch of the MA SMF, senior lecturer, Ph.D.; avtokoleso84@mail.ru

A.Yu. Romanenko, ANPO “Institute of Engineering Physics”, researcher, Ph.D.; info@iifrf.ru

F.A. Pavlov, branch of the MA SMF, researcher; Pavlov_iif@mail.ru

UDC 004.052.2

DOI: 10.34832/ELSV.2025.64.2.009

Abstract. An algebraic code has been developed that allows for the correction of errors in direct and inverse values of the code set when performing arithmetic and logical operations of the processor. Rules have been formulated for grouping error syndrome bits into bits that determine: a block of information bits containing an error; and an erroneous bit in a 3-bit information block. The properties of the algebraic code that ensure the possibility of correcting single errors in information bits; and multiple errors in check bits. A decoding algorithm has been developed that forms the values of the error syndrome bits determining the address of the information block containing the error and the number of the erroneous bit in a three-bit information block; and ensuring the correction of multiple errors in check bits.

Keywords: algebraic code, additional code, information block, inversion operation.