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检索条件"任意字段=Systems of Signals Generating and Processing in the Field of on Board Communications"

共 238 条记录，以下是111-120 订阅

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Multi-Station Access Based on signals with Non-Harmonic Subcarriers

Multi-Station Access Based on Signals with Non-Harmonic Subc...

引用

2021 systems of signals generating and processing in the field of on board communications, SOSG 2021

作者： Gorgadze, S.F. Gut, T.M. Dzhurin, D.V. Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9780738130897

A variant of multi-station access based on Spread Spectrum signals (SSS) with multiphase non-harmonic subcarriers modulated using pseudorandom sequences (PRSs) that provide a direct extension of their spectrum is considered. It is shown that in this case partial frequency-code compaction of signals is provided. In this case, the main PRS provides a direct expansion of the signal spectrum, and the sub-carrier PRS-on the contrary, its narrowing and localization in the frequency domain. The paper considers a variant of channel information encoding when increasing the distance between the points of the information signal constellation when transmitting its closest points on different subcarriers of the PRS, which allows increasing the bandwidth of the communication channel. In addition, the narrowing of the main correlation peak of the synchro-signal, compared with the case of transmission only to the main PRS (without a subcarrier), will improve the accuracy of synchronization and positioning. © 2021 IEEE.

关键词： Frequency domain analysis

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Modeling of Processes in the field of IT Education Implemented with the Use of Remote Technologies

Modeling of Processes in the Field of IT Education Implement...

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2022 systems of signals generating and processing in the field of on board communications, SOSG 2022

作者： Kuptsov, M.I. Kuptsov, I.M. Yablochnikov, S.L. Yablochnikova, I.O. Dzobelova, V.B. Ryazan State Radio and Technical University Ryazan Russia Instamart Technologies Llc Moscow Russia Moscow Technical University of Communications and Informatics Moscow Russia North Ossetian State University Named after Kosta Levanovich Khetagurov Vladikavkaz Russia

ISBN: (纸本)9781665406352

High rates of scientific and technological progress determine the constant increase in demand in the labor market for highly qualified specialists, primarily those engaged in professional activities using IT. In modern conditions, the most relevant skill for graduates of higher educational institutions is the ability to adapt to dynamic changes and improve the information and communication technologies themselves and the means of their implementation. Accordingly, this leads to a significant modernization of the sphere of higher education and the totality of educational processes. In particular, approaches to quality assessment and ways to adequately determine its level are changing. The authors in this article propose to effectively assess the quality of modern education, using mathematical models developed by them. These models are synthesized by the authors based on the theory of fuzzy sets. Which, in turn, allows us to generalize a number of qualitative and quantitative criteria. And, consequently, to ensure the adaptation of models for the implementation of educational processes depending on a variety of identifiable factors. The results of the research carried out by the authors of this article can be very useful for a wide range of representatives of various communities of participants in socio-economic relations. © 2022 IEEE.

关键词： Fuzzy sets

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Digital processing of Radar signals in the Automatic Helicopter Landing System on a Moving Platform

Digital Processing of Radar Signals in the Automatic Helicop...

引用

2021 systems of signals generating and processing in the field of on board communications, SOSG 2021

作者： Gribanov, A.S. Okhotnikov, D.A. Bulanov, K.Yu. Moscow Aviation Institute National Research University Moscow Russia

ISBN: (纸本)9780738130897

The paper deals with the problem of landing a helicopter on a moving platform in difficult weather conditions. The article presents a study of the possibility of automatic determination of coordinates, using antennas located on the blades of a helicopter propeller, relative to the landing site where the radio signal sources are located. This arrangement of the antennas when moving in space allows you to measure the distance to the source of the radio signal due to the Doppler shift of the signal frequency. The implementation of such a system can make it possible to solve the most complex aviation tasks to ensure navigation during takeoff/landing in difficult weather conditions, as well as during search and rescue operations. Such a technical solution allows you to get the direction of the radiation source of the radio signal, as well as the range to it with high accuracy. © 2021 IEEE.

关键词： Landing

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The Effect of the Use of Service Level Agreement for Operators of Transport systems and On-board systems

The Effect of the Use of Service Level Agreement for Operato...

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2021 systems of signals generating and processing in the field of on board communications, SOSG 2021

作者： Zubilevich, A.L. Sidney, S.A. Tsarenko, V.A. Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9780738130897

Fiber-optic communication lines are the basis of telecommunication networks. If at the initial stage of the development of optical communication FOCLs were laid only on transport networks, then as this type of communication develops, there is a transition to fiber-optic technology in intra-facility, including on-board systems. Today, the demand for traffic transmission is constantly growing, which leads to an increase in the amount and speed of transmitted information. Fiber outages result in poor communications, disrupt business processes, backorders, and dissatisfied customers. Even small communication downtime causes huge losses. The introduction of service quality categories will simplify the operation of transport systems and increase the economic efficiency of communication networks. However, this requires significant capital expenditures and annual operating costs, which do not always pay off by avoiding fiber downtime. A method for assessing the effectiveness of the use of a service level agreement (SLA) between an operator of a fiber-optic communication line (FOCL) and consumers of communication services is proposed. The net present value (NPV) is used as an indicator of efficiency;probabilistic characteristics are introduced. The calculation results and their brief analysis are presented. © 2021 IEEE.

关键词： Fibers

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Software-Defined Radio Wireless Communication Technology Design. LibreSDR board Validation

Software-Defined Radio Wireless Communication Technology Des...

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2024 systems of signals generating and processing in the field of on board communications, SOSG 2024

作者： Grigoriev, Vladimir Komissarov, Alexander Ryutin, Konstantin Fokin, Grigoriy Department of Wireless Networks Limited Liability Company "Laboratory of Infocommunication Networks" Saint Petersburg Russia Software Defined Radio Laboratory The Bonch-Bruevich Saint Petersburg State University of Telecommunications Saint Petersburg Russia

ISBN: (纸本)9798350383614

Currently, most of the technical solutions for wireless communications and navigation systems prototyping and validation in academic and scientific community employ Software Defined Radio (SDR) technology. However, wider utilizing of popular and well proven SDR platforms, such as USRP (Universal Software Radio Peripheral), LimeSDR and AD-FMCOMMS boards, is still difficult due to high cost and low availability. One of the solutions to popularize and make SDR wireless communication technology design more accessible for academic and scientific community is the emerging low-cost SDR-platform LibreSDR. Current work is devoted to experimental validation of LTE compliant transmission and reception of reference signals on physical layer, using LibreSDR board. The results of the experimental validation prove the potential of relatively low-cost LibreSDR utilization for wireless communications and navigation systems prototyping with the same performance, as well known USRP boards, among young scientists and students during their education and research in the academic and scientific community. ©2024 IEEE.

关键词： Software radio

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Evaluation of the Efficiency of Blind Signal Separation in the Problem of Detecting BPSK signals

Evaluation of the Efficiency of Blind Signal Separation in t...

引用

2021 systems of signals generating and processing in the field of on board communications, SOSG 2021

作者： Liberovskiy, N.Yu. Chirov, D.S. Priputin, V.S. Moscow Technical University of Communications and Informatics Moscow Russia

ISBN: (纸本)9780738130897

This paper investigates the effectiveness of the blind signal separation algorithm in the problem of detecting digital BPSK signals. The classical methods of blind separation of signals and criteria for signal independence are considered. A model of the studied algorithm for blind signal separation is shown, based on the calculation of a mixing matrix that brings the joint cumulants of the second and fourth orders to zero. To exclude a trivial solution, additional restrictions are imposed on signal dispersions. A system of equations for finding the mixing matrix coefficients is presented. The form of the coefficients of the mixing matrix is shown, which brings the signals to an uncorrelated form. The possibility of an analytical solution of the equation associated with the equality of the joint fourth-order cumulant to zero is shown. A model of modulation and detection of digital signals is described. The simulation result of the blind signal separation algorithm is presented graphically. The efficiency of the proposed algorithm is shown. © 2021 IEEE.

关键词： Blind source separation

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Restoration of Complex signals Distorted by Aliasing as a Result of Bandpass Sub-Nyquist Sampling

Restoration of Complex Signals Distorted by Aliasing as a Re...

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2023 systems of signals generating and processing in the field of on board communications, SOSG 2023

作者： Lesnikov, Vladislav Naumovich, Tatiana Chastikov, Alexander Metelyov, Alexander Vyatka State University Department of Radio Electronic Systems Kirov Russia

ISBN: (纸本)9798350397727

The purpose of this article is to develop a technique for recovering a complex signal distorted by aliasing as a result of sub-Nyquist bandpass sampling. The developed technique is based on the use of multichannel sampling. Its essence is that the signal is processed in several channels. All channels are analog-to-digital converted with different sampling rates, each of which leads to aliasing in its channel. For each channel, a system of equations is compiled that describes the corresponding aliasing. The joint solution of these systems of equations makes it possible to restore the distorted signal. Consideration in this article is limited only to first-order aliasing, in which no more than two aliases overlap at each frequency. This work is a continuation of the approach developed by the authors, called multichannel multirate sampling. © 2023 IEEE.

关键词： Restoration

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Analysis of Power Spectrums in Heart signals to Detect the Presence of Low-Amplitude High-Frequency Components

Analysis of Power Spectrums in Heart Signals to Detect the P...

引用

2023 systems of signals generating and processing in the field of on board communications, SOSG 2023

作者： Ryabov, D. Yu. Mukhametzyanov, O.A. Sedov, S.S. Shcherbakova, T.F. Kazan National Research Technical University Named after A. N. Tupolev - Kai Department of Radio-Electronic and Telecommunication Systems Kazan Russia

ISBN: (纸本)9798350397727

Purpose of this study is effective registration of low-amplitude high-frequency components with predictive value - ventricular late potentials (VLPs) - in electrocardiosignals (ECS) by Ist standard lead. 232 signals were preliminary evaluated to detect VLPs by Simson's method. VLPs were detected in 34 signals. Modification of signal-averaged approach was applicated to analyzed signals. Power spectrums of heartbeat signals' terminal part were analyzed in this study. Designed algorithm showed 82.75% of correct decisions. Originality: new parameter to detect VLPs by Ist standard lead lead was proposed. Parameter's threshold value is calculated. Threshold frequencies with maximal percentage of correct decisions were determined. Opportunity to detect VLPs in signals by Ist standard was evaluated: it is possible to detect VLPs using spectral analysis. Practical significance: results will be useful for ECS analysis block in telemedicine systems and onboard communications. © 2023 IEEE.

关键词： Spectrum analysis

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Calibration of a Planar Scanner for Near-field Antenna Measurements

Calibration of a Planar Scanner for Near-Field Antenna Measu...

引用

2020 systems of signals generating and processing in the field of on board communications

作者： Snastin, M.V. Dobychina, E.M. Moscow Aviation Institute National Research University Moscow Russia

ISBN: (纸本)9781728147727

The main goal of the work is to increase the near field measurement accuracy of antennas characteristics by performing calibration of planar scanner. This becomes possible when using the phaseless switching method for the diagnostics of amplitude and phase scanning errors. The novelty of the proposed solution lies in the fact that the phase state changing of the channel under calibration is performed without the usage of phase shifters by digital methods only. During the research process a simulation model of the calibration process was developed. That model was shown the convergence of the algorithm for any values of phase and amplitude errors. Special software for automatic estimation of measurement errors was developed. Experimental studies of a planar scanner in an anechoic chamber were carried out. The obtained results turn it possible to reduce the amplitude and phase measurement errors in the process of moving the scanner to values corresponding to the industrial standards of high-end devices. © 2020 IEEE.

关键词： Calibration

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Adaptive Compensation for Interference under Radio signals Reception by the Multibeam Antenna System

Adaptive Compensation for Interference under Radio Signals R...

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2020 systems of signals generating and processing in the field of on board communications

作者： Vorontsov, A.P. Maslov, M. Yu Bosomykin, D.V. Gavrilov, A.A. Federal State Unitary Enterprise Radio Research Development Institute FSUE NIIR Moscow Russia Head of the Center Samara Branch Federal State Unitary Enterprise Radio Research Development Institute FSUE NIIR Moscow Russia

ISBN: (纸本)9781728147727

The concept of organizing interference compensation when receiving a radio signal by the multipath antenna system is considered. Methods for improving the quality of radio signal reception in a complex interference environment with the definition of a promising method for use are considered and analyzed. Schemes for constructing a dish antenna system of a compensation antenna with the development of recommendations for construction are considered and analyzed. Variants of technical solutions for creating a broadband antenna feed are considered, an analysis of the results is carried out, and proposals for further research are formulated. © 2020 IEEE.

关键词： Antenna feeders

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