T-Comm最新文献

{"title":"SIMULATION OF AN UNMANNED AIRCRAFT FLIGHT IN MATLAB SIMULINK","authors":"N.V. BELOV, V.N. REPINSKY","doi":"10.36724/2072-8735-2023-17-6-37-47","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-6-37-47","url":null,"abstract":"In this article, a simulation model of an unmanned aerial vehicle in Matlab Simulink has been developed. To build a simulation model, a mathematical description of the equations of motion of an aircraft (AC) is performed: kinematic and dynamic models with six degrees of freedom and twelve state variables, and a mathematical description of external forces acting on the aircraft is also performed. The simulation model includes several blocks that interact with each other to ensure the operation of the unmanned aerial vehicle: the air craft dynamics unit, which is responsible for simulating the movement of the aircraft in three dimensions, the autopilot unit, which simulates the operation of the aircraft navigation system and provides stabilization in the air, the control unit engines, which regulates the speed of rotation of the engines depending on the control signals, an external environment block that simulates the air environment in which the aircraft moves. The main advantage of the constructed model is the ability to change the parameters of the aircraft interactively and evaluate the main parameters using graphs. The correctness of the autopilot operation is confirmed by the graphs of transient processes along the three axes of the aircraft: roll, pitch, yaw. In the future, based on the constructed model, it is possible to create a fully automatic obstacle avoidance system that will allow the unmanned aerial vehicle to safely move from the start to the end point, taking into account all the obstacles in the flight path. Thus, the simulation model of an unmanned aerial vehicle based on Simulink makes it possible to evaluate the operation of the autopilot and other aircraft systems with high accuracy and detail. Its use can be useful in the design and testing of new unmanned aerial vehicles.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135754115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FULL ENUMERATION METHODS ON GRAPHS","authors":"V.N. KUDELYA","doi":"10.36724/2072-8735-2023-17-7-57-64","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-7-57-64","url":null,"abstract":"Requirements for algorithms for specific problems of discrete mathematics are changing. This is dictated by an urgent need to increase calculation accuracy in technology-related problems brought about by rapid digitization and virtualization, which actively permeated various scientific areas and changes the approach to previously studied objects. These objects include n-dimensional structures, known as circular structures, that describe global processes occurring in communication networks, multi-processor systems, in collective communications, stock market structures etc. Given that, both the development of new mathematical methods of solving problems and the solution of related calculation problems are deemed important. The enumeration method, based on various modifications of systematic viewing (traversal) of graph elements and labeling, has been widely used and quite fully developed for a long time. The purpose of the article is to announce graphs presentation and the enumeration methods on graphs presentations: the transposition method and the node-graph method. This publication presents the basic results of the author's work on reducing the severity of the NP-complete problem class.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALYSIS OF NETWORK RESOURCE SCALING MODELS IN 5G NETWORK","authors":"V.S. ELAGIN, A.S. VASIN","doi":"10.36724/2072-8735-2023-17-5-32-41","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-5-32-41","url":null,"abstract":"This article analyzes the existing models of virtual network embedding and dynamic scaling of virtual network resources for Network Slices. These models make it possible to provide services with the required QoS while respecting the concept of efficient network resource usage. Dynamic virtual network embedding models allow virtual networks to be efficiently mapped on a substrate network and reconfigured on demand. But for more flexible dynamic scaling, Holt-Winters, Bi-LSTM and etc. models are additionally used, which are built according algorithms for predicting future resource utilization in order to reduce the initialization time of virtual network function instances serving certain Network Slices. Dynamic scaling models are compared and conclusions about the possibility of their use are given. As a conclusion we were made a summary about the possibility of using these models and the necessity of improvements for more flexible use in 5G networks.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DISTRIBUTED REGISTRY OF VEHICLE OPERATING HISTORY BASED ON THE BLOCKCHAIN PLATFORM HYPERLEDGER FABRIC","authors":"S.V. BEZZATEEV, T.N. YELINA, E.S. KHODYREVS.","doi":"10.36724/2072-8735-2023-17-8-38-44","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-8-38-44","url":null,"abstract":"Due to the rapid development of various transport platforms, including those using unmanned technologies, systems that provide storage of vehicle operating history throughout its lifecycle are becoming increasingly relevant. Purpose: the purpose and functionality of the developed system for storing such information are defined. The main purpose of the system is to maintain a single source of reliable and unchangeable information about the operating history of the vehicle. Such a system can increase the transparency of business processes that arise between participants in the automotive industry: manufacturers and owners of vehicles, service stations, insurance companies and other industry participants. Methods: Blockchain technology, smart contracts and various methods of transaction processing were used. Results: the system was designed based on a distributed platform, based on the criteria defined in the work, Hyperledger Fabric was chosen as the platform. Communication network and information system architecture were designed and developed based on the distributed registry technology. The paper describes the process of creating the Hyperledger Fabric network, which is supported by the member organizations of the automotive industry. A description of the basic elements of the system is presented, as well as the mechanisms that maintain and harmonize the distributed registry, transaction processing, execution of smart contracts and interaction of the connected system participants. The hardware was designed in the form of a plug-in unit, which implements the functions of collection and pre-preparation of data collected from the nodes, units, sensors of the vehicle, as well as additional sensors built into the hardware unit. The collected data are transmitted from the block to the storages, the maintenance of which is carried out by the system participants interested in such data. The fact of data transfer and data source identifier is recorded in a distributed registry in the form of a transaction, placed in the block. Practical relevance: On the basis of smart contract technology the issues of forming reports on the history of vehicle operation are considered. The system is scalable and allows the deployment of new smart contracts, which provides the ability to create new scenarios for its use. Discussion Possible variants of further development and use of the system are considered: the solution of scaling the system by local zones is proposed, and a brief overview of the approach of dynamic channel definition Hyperledger Fabric using dedicated near-field data communication is presented.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"487 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EVALUATION OF THE VALUE OF EQUIVALENT ENERGY LOSSES DUE TO THE QUALITY OF FREQUENCY SYNTHESIS FUNCTIONING IN DIGITAL COMMUNICATION SYSTEMS WITH QUASI-COHERENT RECEPTION OF SIGNALS WITH QUADRATURE AMPLITUDE KEYPAD","authors":"V.G. DOVBNYA, D.S. KOPTEV, LEON REA HERMAN FLORESMILO, G.I. PODKHALDIN","doi":"10.36724/2072-8735-2023-17-5-58-63","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-5-58-63","url":null,"abstract":"Useful transmitted information when using digital transmission systems with quadrature amplitude shift keying lies in the change in the amplitude and phase of the signal. This circumstance causes significantly higher requirements for the magnitude of destabilizing factors, namely the phase noise of signal packages at the input of the demodulating device of signals with quadrature amplitude keying, which affect the useful signal, resulting in a decrease in the reliability of reception. In this article, we restrict ourselves to considering the requirements for short-term frequency stability of synthesizers of digital transmission lines, which use signals of multi-position quadrature-amplitude keying in conjunction with quasi-coherent reception. The carrier wave is extracted on the receiving side directly with the help of a carrier recovery device from the received QAM signal by demodulating it, followed by narrow-band filtering. The phase-locked loop in this case functions as a narrow-band tunable filter for extracting the carrier wave. An increase in the quality of demodulation and signal filtering processes leads to a decrease in the phase fluctuation of the restored carrier, a decrease in the level of additive noise, and a decrease in the magnitude of energy losses when using quasi-coherent reception compared to the ideal one, which requires the complete absence of a phase error of the selected reference signal. Such an approximation of the noise immunity of real coherent QAM demodulators to the theoretical one limits the phase noise of the signal at the demodulator input, which is associated with the non-ideal operation of frequency synthesizers on the transmitting and receiving sides of digital communication lines. The research methods used in the article are based on the theories of potential noise immunity, demodulator synchronization, and phase locked loop systems. For the carrier recovery device, the noise band value was chosen in the range from to (where T – is the symbol duration), since with the indicated ratios, the distribution law of the phase error can be considered normal. It was assumed in the work that the devices for automatic gain control and clock synchronization in the radio receiving system function ideally, and the frequency response of the channel corresponds to the Nyquist condition.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MODELS OF SENSOR NETWORKS WITH CORRELATED SOURCES","authors":"A.V. BORISOVSKAYA","doi":"10.36724/2072-8735-2023-17-7-21-28","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-7-21-28","url":null,"abstract":"One of the important scientific directions in the research of the Internet of things is the analysis of monitoring systems for random events with correlated sources based on random multiple access. Taking into account the correlation of data from nearby sensors increases the energy efficiency of the system and ensures the stability of its operation. There are various models of such systems, but there is no connection between them. The purpose of this paper is to develop a unified system of assumptions for describing models of systems with random access and correlated sources. In this paper, the main scenarios of the Internet of Things are described and a scenario with a large number of sensors is selected, on the basis of which systems for monitoring random events are built. A review of papers in which systems with random access and correlated sources are studied is carried out. A method for separating existing models into two classes is proposed: models with the arrival of events and models with the arrival of users. A unified system of assumptions for models of both classes is proposed, which allows describing and comparing different models with each other. A simplified model of a system with random access and dependent sources is presented, which retains the main properties of the Internet of things systems. This model is easy to analyze and has no \"edge effects\". A brief overview of the research on the average age of information in various data transmission systems is also given. The results of the review showed that this characteristic is important for systems with correlated sources, but at the moment it is practically not studied in such systems. The proposed system of assumptions for describing various models with correlated sources and the presented simplified model with a circle can be used in the theoretical analysis of monitoring systems for random events.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FINDING INFORMATION SETS WHEN CORRECTING ERROR BURSTS WITH QUASI-CYCLIC CODES","authors":"M.N. ISAEVA","doi":"10.36724/2072-8735-2023-17-7-4-12","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-7-4-12","url":null,"abstract":"This article discusses the question of assessing the probability of finding information sets in block-permutation and block-circulant matrices. Traditionally, interference-resistant coding is considered independent errors, however, in real systems they can be grouped and generate a so-called error burst. Known estimates of the probability of finding information sets are conducted for random matrices, and for correcting error bursts widespread block-permutation low density parity check codes (LDPC-codes) or block-circulant quasi cyclic codes (QC-codes) can be used. To estimate the probability of finding information sets mathematical modeling was used. Experiments have been carried out to identify parameters for specific structures that give the greatest probability of finding information sets. The article presents the results reflecting certain features in the values of the probability of finding information sets for matrices of different types, given assumptions and hypotheses about the features. Dependence of the presence of an information set from the size and location of its search interval inside the block permutation matrix was identified. The results of this research may be used to reduce the complexity of decoding by information sets, which, when considering random matrices, is exponential.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A MODULATION PARAMETERS OF NEW COMMUNICATION SYSTEMS","authors":"A.P. ZHURAVLEV, K.YU. RYUMSHIN, O.I. ATAKISCHEV, E.A. TITENKO, M.A. TITENKO","doi":"10.36724/2072-8735-2023-17-7-13-20","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-7-13-20","url":null,"abstract":"The work consists in describing the types of modulation and their parameters for the selection and construction of modern digital communication networks with multiple subscriber access to network resources and high-speed interconnection. The goal is to systematize communication systems and provide multiple access of network subscribers to resources and high-speed data exchange. Solution method. The article discusses the technologies and standards of modern communication systems in terms of the structure of the construction of receiving and transmitting devices from the conversion of an analog signal into a digital form to the flow of symbolic solutions from the output of the demodulator. The classification of types of wired/wireless communication, communication standards, types of modulation on an analog carrier is carried out. The features of the hardware implementation of receiving and transmitting devices, transmission speeds and operating conditions of communication channels were taken into account. The largest manufacturers of the element base and specialized digital signal processing chips are presented, on which the interfaces of the physical layer of most receiving and transmitting devices of communication systems are implemented. As a result of the analysis, a set of modulation types that are currently used in most communication channels was determined, as well as the main parameters of their operation.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RESOLUTION TIME THEORY IN THE TOPIC OF BROADBAND COMMUNICATIONS. ALGORITHM FOR DATA DEPENDENT JITTER AND CAPACITY ESTIMATIONS WITH POLYNOMIAL TIME EXECUTION","authors":"I.M. LERNER, A.N. KHAIRULLIN","doi":"10.36724/2072-8735-2023-17-5-48-57","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-5-48-57","url":null,"abstract":"At present, due to the constant growth of the volume of transmitted information, more and more attention is paid to the issues of the possibility of increasing the transmission speed due to the use of the transmission mode \"above the Nyquist rate\". Despite the relevance of this research topic, due to rather large mathematical difficulties, it is difficult to obtain significant results. One of the theories that allows for a breakthrough is the rapidly developing theory of resolution time developed for phase radio engineering data transmission systems and information measuring optoelectronic systems with PAM-signals with square pulses. This paper presents a novel method for capacity and resolution time estimations with polynomial computational complexity that does not depend on the size of the channel alphabet of PAM-n-signals and is determined only by the effective memory value. The shape of pulse of PAM-n-signals has arbitrary form and amplitudes take only possitive values. The method also allows estimating the time limiting possible deviations due to the sampling error in time, at which the information about the channel symbol will be read error-free or with a given error probability.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NEW QUASI-OPTIMAL ALGORITHMS OF ANTENNA SELECTION WITH LOW COMPLEXITY","authors":"M.G. BAKULIN, V.B. KREYNDELIN, M.L. KHAZOV","doi":"10.36724/2072-8735-2023-17-7-47-56","DOIUrl":"https://doi.org/10.36724/2072-8735-2023-17-7-47-56","url":null,"abstract":"Classical MIMO system model without antenna selection and MIMO system model with antenna selection are presented. New quasi-optimal low complexity algorithms of antenna selection are proposed for MIMO communication systems. These algorithms allow to achieve high spectral efficiency without significant increase of complexity. The statistical modeling method is used to evaluate the efficiency of the proposed algorithms and to compare their characteristics with the characteristics of the known algorithms of full and partial combined selection. The computational complexity of the proposed algorithms is evaluated and been compared with the computational complexity of the well-known algorithms of full and partial combined selection in low-order and high-order MIMO system configurations. The possibility of practical application of new quasi-optimal algorithms in real communication systems is clearly demonstrated by comparative analysis of error-rate performance in conjunction with an assessment of computational complexity. These applications provide significantly improving of the energy performance of MIMO communication systems and it allows to improve quality characteristics of communications for subscribers or could be exchanged to the lower price of construction and maintenance of real communication systems.","PeriodicalId":263691,"journal":{"name":"T-Comm","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135753907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}