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New Kind of Mother Constellation for SCMA Systems 单片机系统的新型母星座
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-07 DOI: 10.1134/s1064226923140048
M. G. Bakulin, T. B. K. Ben Rejeb, V. B. Kreyndelin, D. Yu. Pankratov, A. E. Smirnov
{"title":"New Kind of Mother Constellation for SCMA Systems","authors":"M. G. Bakulin, T. B. K. Ben Rejeb, V. B. Kreyndelin, D. Yu. Pankratov, A. E. Smirnov","doi":"10.1134/s1064226923140048","DOIUrl":"https://doi.org/10.1134/s1064226923140048","url":null,"abstract":"<p><b>Abstract</b>—Sparse code multiple access (SCMA) is a variation of the nonorthogonal multiple access (NOMA) technology. SCMA communication systems use codebooks based on multidimensional constellations, which are generated using original mother constellations. The properties of these constellations largely determine the efficiency of SCMA communication systems. This paper proposes new mother constellations for use in SCMA systems. The proposed constellations were synthesized using a new analytical method for describing tabular functions in the form of a functional dependence of the signal on the vector of binary variables. This representation made it possible to reveal some patterns and determine the characteristics of constellations that affect the efficiency of their use. In particular, a new type of two-dimensional constellation with a parametric description, called Arrow constellations, is proposed. The proposed constellations belong to the class of multidimensional constellations and can be used both independently and in codebook synthesis in SCMA systems. The best effect from using these constellations is observed in SCMA systems with a turbo receiver, in which both the demodulator and the decoder are operated with the same feedback.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140881863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Separation of Polydisperse Charged Microparticles in Air by an Electrodynamic Linear Trap 利用电动线性捕集器分离空气中的多分散带电微粒
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-07 DOI: 10.1134/s1064226923140073
M. S. Dobroklonskaya, L. M. Vasilyak, V. I. Vladimirov, V. Ya. Pecherkin, D. I. Popov
{"title":"Separation of Polydisperse Charged Microparticles in Air by an Electrodynamic Linear Trap","authors":"M. S. Dobroklonskaya, L. M. Vasilyak, V. I. Vladimirov, V. Ya. Pecherkin, D. I. Popov","doi":"10.1134/s1064226923140073","DOIUrl":"https://doi.org/10.1134/s1064226923140073","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of separation of a polydisperse mixture of charged dielectric microparticles using a linear electrodynamic quadrupole trap in air at atmospheric pressure are presented. It has been experimentally shown that the sizes of the microparticles held by the trap strongly depend on the voltage at the linear electrodes.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of the Spectral Response of nBn Photodiodes Based on InAsSb 基于 InAsSb 的 nBn 光电二极管光谱响应研究
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-07 DOI: 10.1134/s1064226923140115
V. S. Kovshov
{"title":"Investigation of the Spectral Response of nBn Photodiodes Based on InAsSb","authors":"V. S. Kovshov","doi":"10.1134/s1064226923140115","DOIUrl":"https://doi.org/10.1134/s1064226923140115","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The classical structure of <i>n</i>B<i>n</i> photodiode based on InAsSb for the detection in the mid-wave infrared (MWIR) range is considered. The optical absorption in the heterostructure at any position is calculated with allowance for the features of absorption of the InAsSb active layer, in particular, the Burstein–Moss effect and the Urbach rule. The quantum efficiency and spectral response of the sensitivity are calculated taking into account multiple reflections at the interfaces of the heterostructure and the features of free-carrier absorption in the GaSb substrate. The optimal thickness of the active layer of the <i>n</i>B<i>n</i> photodiode is determined for various lifetimes of minority carriers. Relatively high BLIP detectivity of the FPA is shown.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectroscopy of Semiconductor Heteroepitaxial Structures Based on InGaAs for the Development of NIR Photodetectors 用于开发近红外光电探测器的基于 InGaAs 的半导体异外延结构光谱学
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-07 DOI: 10.1134/s1064226923140103
A. M. Kosyakova, V. S. Kovshov, M. O. Mozhaeva
{"title":"Spectroscopy of Semiconductor Heteroepitaxial Structures Based on InGaAs for the Development of NIR Photodetectors","authors":"A. M. Kosyakova, V. S. Kovshov, M. O. Mozhaeva","doi":"10.1134/s1064226923140103","DOIUrl":"https://doi.org/10.1134/s1064226923140103","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Studies and analysis of samples with heteroepitaxial structure based on a InGaAs solid solution grown by molecular beam epitaxy on a GaAs substrate are presented. The composition and thickness of the layers of the structure were determined by photoluminescent spectroscopy at room temperature and scanning electron microscopy, respectively. Transmission spectra were measured on an IR Fourier spectrometer. An analytical model of the spectral characteristics of the studied structures has been developed. By solving the inverse problem, the structural parameters of the structure and the composition of the InGaAs active layer were determined by the fitting method. A comparative analysis of experimental and theoretical data showed a small spread of values for the thickness (less than 65 nm) and the composition of the absorbing layer (less than 0.04). The correctness and speed of the developed method of characterization of semiconductor structures without plate destruction is shown.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of TDI Channels with Anomalous Noise on the Probability of Detection of Small-Size Objects by FPAs 带有异常噪声的 TDI 信道对 FPA 检测小尺寸物体概率的影响
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-07 DOI: 10.1134/s1064226923140012
V. V. Abilov, V. A. Streltsov
{"title":"Effect of TDI Channels with Anomalous Noise on the Probability of Detection of Small-Size Objects by FPAs","authors":"V. V. Abilov, V. A. Streltsov","doi":"10.1134/s1064226923140012","DOIUrl":"https://doi.org/10.1134/s1064226923140012","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The effect of anomalous (with respect to noise power spectral density) TDI channels on the probability of detection of small objects by FPAs is considered. A series of FPA output images simulating the signals of TDI channels with four main types of noise PSDs is generated, the probability of detection of a small object is calculated, and the efficiency of various combinations of linear filters used in intraframe processing is evaluated. It is found that TDI channels with low-frequency noise most significantly affect the probability of detection of a small object, and the successive application of an adaptive recursive filter and a window filter that is quasi-matched with the signal leads to an increase in the probability by 22% even in the presence of 6% anomalous TDI channels in the FPA.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Online Aggregation of Conformal Forecasting Systems 共形预测系统的在线聚合
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-07 DOI: 10.1134/s1064226923140188
V. V. V’yugin, V. G. Trunov
{"title":"Online Aggregation of Conformal Forecasting Systems","authors":"V. V. V’yugin, V. G. Trunov","doi":"10.1134/s1064226923140188","DOIUrl":"https://doi.org/10.1134/s1064226923140188","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\u0000<b>Abstract</b>—</h3><p>The problem of online probabilistic time series forecasting is considered. Probabilistic forecasts are obtained as a result of the application of conformal forecasting systems. The conformal forecasting system is defined on the basis of point forecasts of the regression algorithm. The corresponding probability distribution function is used to assess the degree of reliability of the algorithm’s predictions. The paper considers the case when at each moment of time several competing methods (experts) present their forecasts in the form of distribution functions. These distributions are constructed online from point predictions using the conformal prediction method. The probabilistic forecasts of experts are combined using an aggregating algorithm into one probabilistic forecast at each stage of the forecasting process, while expert forecasts can be used at a discount. A technology has been developed for constructing predictive expert algorithms and aggregation of their probabilistic forecasts on the example of the problem of forecasting the hourly load of an electric network depending on the temperature forecast. The results of numerical experiments on real data are presented; a comparative analysis of the method of conformal predictions and the method of Gaussian mixtures is carried out.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nature of Silvery Clouds 银色云朵的性质
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-07 DOI: 10.1134/s1064226923140164
A. N. Sviridov, L. D. Saginov
{"title":"Nature of Silvery Clouds","authors":"A. N. Sviridov, L. D. Saginov","doi":"10.1134/s1064226923140164","DOIUrl":"https://doi.org/10.1134/s1064226923140164","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The dynamics of the temperature of particles with a characteristic size of 10<sup>–7</sup>–10<sup>–6</sup> m at the boundary of Earth’s atmosphere and outer space is considered. Using graphite as an example, it is shown that at an altitude of 80–90 km from Earth’s surface, particles with a size of ∼5 × 10<sup>–7</sup> m or less can be heated above the temperature of the beginning of the glow (~900 K), reaching temperatures of more than 2000 K with a light turquoise glow. Based on the results obtained, it is concluded that the silvery clouds observed in the false dawn and after sunset from Earth’s surface are a cluster of white-hot nanoparticles.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140881884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Creation of High-Power Technological Nanosecond Frequency-Pulse Solid-State Lasers: Problems and Solutions 创建高功率技术纳秒频率脉冲固体激光器：问题与解决方案
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-01 DOI: 10.1134/s1064226923120161
V. E. Rogalin, K. M. Krymskii
{"title":"Creation of High-Power Technological Nanosecond Frequency-Pulse Solid-State Lasers: Problems and Solutions","authors":"V. E. Rogalin, K. M. Krymskii","doi":"10.1134/s1064226923120161","DOIUrl":"https://doi.org/10.1134/s1064226923120161","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A review analysis of the problematic aspects of creating high-power nanosecond frequency-pulse solid-state lasers for use in various technological fields, including the electronics industry, has been carried out. Considered installations with various pumping methods (lamp and diode) in the frequency (about 100 Hz) of generation in the micron region of the infrared range. The possibilities of increasing the energy potential of influencing pulses in master oscillator-amplifier circuits, including two-pass amplification, are analyzed. Discussed possibilities and prospects for the use of lasers with active elements (AEs) on glass, as well as the synthesis of large-sized garnet single crystals with an admixture of rare earth elements and optical ceramics for the production of AEs.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140006725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Initial Parameters Selection for Serving Uplink URLLC Traffic of High-Mobility Users 服务高移动性用户上行链路 URLLC 流量的初始参数选择
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-01 DOI: 10.1134/s1064226923120185
A. E. Shashin, A. N. Krasilov, E. M. Khorov
{"title":"Initial Parameters Selection for Serving Uplink URLLC Traffic of High-Mobility Users","authors":"A. E. Shashin, A. N. Krasilov, E. M. Khorov","doi":"10.1134/s1064226923120185","DOIUrl":"https://doi.org/10.1134/s1064226923120185","url":null,"abstract":"<p><b>Abstract</b>—5G cellular systems provide a new service called Ultra-Reliable Low-Latency Communications (URLLC). In many URLLC scenarios (e.g., intelligent transport systems), users move at high speed and transmit data in the uplink. The base station shall assign transmission parameters that satisfy the strict quality of service requirements of URLLC applications and consume the least amount of channel resources. At high speed, users often change the serving base station. In this case, the task of selecting transmission parameters is complicated by the fact that the base station does not have channel quality measurements for the new user. This paper proposes various methods for selecting the initial transmission parameters when user connects to the base station. Using simulations, the paper compares various methods for different user speeds. Recommendations are given on the selection of initial parameters that provide a low amount of consumed channel resources.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140006888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Absorbing Screens of Microstrip Assemblies 微带组件的吸收屏蔽
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2024-03-01 DOI: 10.1134/s1064226923120021
M. V. Alimov, A. A. Zhukov, S. D. Yakukhin
{"title":"Absorbing Screens of Microstrip Assemblies","authors":"M. V. Alimov, A. A. Zhukov, S. D. Yakukhin","doi":"10.1134/s1064226923120021","DOIUrl":"https://doi.org/10.1134/s1064226923120021","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A screen that absorbs electromagnetic radiation has been proposed, a micromachine technology for its production has been developed based on volumetric microprocessing of single-crystalline silicon, experimental samples have been manufactured, and their characteristics have been studied. It is shown that in the measurement frequency range of 14.7–26.7 GHz there is a smooth increase in the attenuation introduced by the absorbing screen with increasing frequency to a maximum value of 20–23 dB at a frequency of about 20 GHz, and then a smooth decline. The amount of attenuation increases as the length of the screen increases and can reach any value. The manufactured samples of the absorbing screen provide significant attenuation in the required frequency range with a small substrate thickness and can be successfully used in space equipment to ensure electromagnetic compatibility.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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