2020 Moscow Workshop on Electronic and Networking Technologies (MWENT)
The work is devoted to the mathematical models study for operational failure rate estimating of traveling wave tubes. The detailed analysis of the parameters taken into account in the considered models is carried out. The key factors that have the greatest impact on the reliability characteristics are highlighted. Based on the results of numerical evaluation of the traveling wave tubes operational failure rate according to the considered mathematical models, a significant difference in the obtained results is shown. Mathematical models of operational failure rate, taking into account the key factors (temperature and manufacturing technology) based on the analysis of the causes of failure of traveling wave tubes are recommended to use. However, the considered mathematical models, in aggregate, do not take into account the key factors. This leads to an unreliable assessment of the reliability characteristics at the design stages
LoRa wireless network has become a widely spread technology among IoT systems recently. LoRa allows to use various ISM bands such as 433 MHz, 868 MHz and 915 MHz. During this study 433 MHz and 868 MHz frequencies have been compared. Parameters such as SNR and RSSI were measured at different floors and visualized. A comparative table of packet delivery ratio at various spreading factors can be found in this paper. A series of range experiments at different spreading factors showed that 433 MHz LoRa module gains a stronger signal. However, 868 MHz LoRa module shows higher percentage of received packets. It has been concluded that for nine-story building with concrete floors it is better to deploy 868 MHz LoRa network at 10th spreading factor.
The paper presents a solution to the question of increasing authenticity and accuracy in predicting dependability, in particular, the reliability of electronic equipment (EE) by simulation modeling. A review and analysis of existing solutions is carried out and their drawbacks are identified. The description of the developed FPGA based VI-module is given, which allows to assess the EE reliability characteristics with an accuracy of 18 decimal places. Also, the developed VI-module is highly reliable due to the use of a random number generator with a repetition period depending on the type of FPGA up to 2^(64-1) in the form of hardware/software implementation based on FPGA.
In this paper, we do an early study of circuit parameter variation for temperature-resistant SOI CMOS production technology on the examples of several standard circuit fragments. Circuits electrical characteristics are simulated at several values of temperature (in the range +27…+300 °C) and with account for MOSFET parameter mismatch figures derived from measurement data. The method involving a library of corner models provides a reasonable estimate of circuits behavior scatter due to the simultaneous influence of very high temperature and production process variability.
A DHA FH OFDMA that uses order statistics- based techniques can be a very promising technique for mMTC systems. However for any case of practical interest the transmission rate of a classical DHA FH OFDMA system is relatively low due to complexity restrictions. To solve this problem a solution using concatenated coding in multiple disjoint subbands has been proposed recently. In this paper another solution based on muti-tone multi-code transmission in a single subband is advocated. It is demonstrated that the proposed solution outperforms the single-tone DHA FH OFDMA using the same detector in terms of both complexity and performance and has lower complexity and latency and almost the same performance than the previously proposed multi-tone coded modulation scheme.
In this work, we would like to suggest the algorithm of technical specification on thermal modeling of on-board electronic systems. It solves the problem of gaining the projected working accuracy in high heat load including internal heat release on electronic components of on-board radio electronic systems. That is a problem which is often faced by radio-electronic’ designers. We focus on thermal modeling in “ASONIKA” space. As an example of circuit board, we use laser gyroscope. As a result, developed by us methods of ensuring high reliability can be used not only in the development of a laser gyroscope, but also for vast variety of radio electronic devices. The main purpose of this project is to get system approach and improve reliability. The method is applicable not only for Zeeman laser gyroscope but also for vast variety of optoelectronic devices. Implementation of this method in optoelectronic devices’ design allows us to get system approach and improve reliability and working accuracy in various heat ranges.
The authors propose a methods for providing thermal operation modes of on-board navigation devices. The methods allow to solve one of the problems that developers of on-board navigation systems are faced with – to ensure the specified accuracy of operation at high heat loads, including internal heat generation on the electronic components of printed circuit assemblies. The authors propose adding, at the initial stages of preparation for the simulation, permissible control for random variations in the parameters of electronic components. This approach is a significant difference from the standard procedure for modeling thermal conditions. The ability to take into account random variations in the parameters of electronic components becomes possible if there is a formed base of structural elements. The application of the developed methods in the design of electronic on-board navigation devices allows a systematic approach to development and to increase the reliability and accuracy of devices to the technical task required level.
The authors propose to provide for the use of digital counterparts of physical processes in the electronic equipment of cyber-physical systems in their design for a long duration of active existence, for example, spacecraft in orbit or in a long flight. At the same time, it is proposed to create a database of big data in which synthesized digital counterparts are stored in the on-board computers of cyber-physical systems. They are designed to monitor sensor readings of electrical, thermal, mechanical and other physical processes of space equipment. The algorithm of functioning of the proposed structure of the cyber-physical system is constructed. The paper experimentally confirms the need to take into account the mutual influence of heterogeneous physical processes of the space cyber-physical system when creating digital counterparts for it.
A model of a composite consisting of a dielectric base with a small admixture of semiconductor nanoparticles shaped as identical ellipsoids of revolution is considered. A uniform spatial distribution of the impurity and a uniform distribution of the directivity of the axes of revolution are assumed.
It is shown that the formulas obtained for the effective dielectric constant of the composite correspond to a superposition of two Debye processes with different relaxation times. The dielectric constant strongly nonlinearly depends on the ratio of semi-axes of the ellipsoids of revolution. This feature allows one to obtain good agreement with experimental data under the assumption that the aggregation of nanoparticles is possible even at low concentrations.
The model implies that, in the absence of an increase in the aggregation of conducting nanoparticles with an increase in the concentration, the dielectric constant of the composite linearly depends on the impurity concentration. For a composite with growing aggregation of nanoparticles, this dependence exhibits a nonlinear growth.
The controller design for a high-order object prone to oscillations under sufficient of interest in automation and robotics is being solved. For the first time, the square root in the error growth detector used as a component for the cost function calculating unit is proposed. Justification for this proposal is given, and the effectiveness of such modification of the cost function is demonstrated on example of object. Software SimInTech was used for some calculations. It was shown that strong procedures of optimization are wide necessary for controller design.
We propose a novel switching element with decentralized control for communication systems. In the paper for convenience we have proposed some fragments of the description of a switching element in the VHDL hardware description language. Such switching elements can become part of the switch fabric of NoC technology routers. In our opinion, the decentralization of the switching elements control provides the following advantages: distributed arbitration rather than centralized; flexible balancing of the information traffic due to the shared use of network buffers for various routes; packet route diversity for the same sources and receivers; simplification of port controllers improved scalability of the intra-chip communication system. In addition, we guess that NoC communications can find application in IoT technology, because it combine routing functions with information processing functions.
The availability of high-resolution satellite images obtained through space radio communications offers the opportunity to use the most advanced technologies and techniques for analyzing remote sensing data. The paper discusses the data obtained with the use of ground-based, airborne or space-based filming equipment, which makes it possible to obtain images in one or several sections of the electromagnetic spectrum. This article provides an overview of existing artificial spacecraft and systems for obtaining space data. Also, there are the examples of the use of convolutional neural networks (CNN) for processing data obtained from artificial Earth satellites. CNN has a high learning ability and the capacity to automatically learn optimal functions based on the data.
For analytically defined families of three-dimensional circulant networks with a parametric description, an analytical algorithm for finding shortest paths which has a common scheme for all networks of the family based on a given generating function was developed. A comparative analysis of three routing algorithms (analytical Two-terminal routing algorithm, Coefficients search on graph generators, and Dijkstra’s algorithm) for a variety of circulant networks from an analytically defined family was carried out. Estimates of the effectiveness of the considered routing algorithms for use in networks-on-chip were obtained.
MWENT is IEEE-sponsored workshop whose objective is to bring together scientific researchers, engineers, students, technical managers and others from both industry and academia to present and discuss papers. The meeting was established with the support of the IEEE Russia Section to address networking from both fundamental viewpoints as well as system-level perspectives. The Workshop is forum for long-term innovation and original approaches to telecommunications and electron devices problems. We also have outstanding technical topics on many important aspects of network systems – waveform design, channel modeling, performance bounds, multi-user techniques, interference issues, wideband antennas and applications in communications. Internet becomes the hot topic in these days, and we were watching that mobile communication and Internet have revolutionized our way of living as well as working. As we are used to such conveniences, it needs more bandwidth, and more spectrum requirements. The ever increasing demands are challenging to the ingenuity of the microwave and control engineers. This biennial meeting is for all engineers and researchers who work or are interested in future developments of MWENT topics of interest. Distinguished delegates and renowned experts will be participating and delivering keynote addresses and lecturers in the emerging areas. Different levels and characters of presentations are accepted: presentation of research and scientific results, new ideas, valuable conclusions from experience, and state of the art. A special invitation goes to our industrial community to exhibit their latest products, inform us about their services and participate in the conference with papers. We also encourage you to plan ahead and take advantage of the wonderful opportunity to meet and exchange ideas with the largest gathering of experts. The technical program spans most of the key areas in wireless communications and electron devices. As is evident from just those categories alone, the exciting technical program will almost assuredly provide some topics of interest for all attendees. Many papers were received as a result of the open call. In keeping with the goal at MWENT to become one of the highest quality conferences in Moscow, the acceptance rate was less than 70 %. The final Program and Proceedings contains 160 papers, selected from submitted manuscripts through a rigorous review process. Our Scientific Program Committee worked with many reviewers worldwide to select papers for the program. The Organizing Committee extends thanks to the authors and reviewers. Your participation and interest are appreciated. Just as new technologies are not developed in a single laboratory at an identifiable moment in time, new conferences are not successful if they exist only once. Evolving technologies require continuous meetings to provide the interested community an opportunity to maintain the dialog. The participants of MWENT and Tomsk Chapter both recognize this. Therefore, we decided to organize a next event in 2022.
The article is devoted to the research, collection and analysis of geospatial data obtained by scrapping information from interactive maps or other public web resources. The data obtained can be used for the further research and identification of patterns or inaccuracies, as well as forecasting and visual presentation of the results. To solve the problem, an original concept is proposed for retrieving data that is on public servers, and which can be accessed using API (application program interface). This approach will be useful for research institutes, organizations for the formation of statistical and analytical reports and the provision of a spatial data set.