Research Progress in Methods to Estimate High-resolution Direction of Arrival by Wei ZHAO, Xuan LI, Chengpeng HAO

“…The research in this paper can be applied to modern radar/sonar detection, radio communication, and navigation, showing high application value.…”
Get full text

On-Line Temperature Monitoring System of Electrical Equipment Based on Passive Wireless Sensor by Jin Zhu, Yang Yang, Fei Du, Zhiyi Wen, Yongqing Xiao

“…Aiming at the disadvantages of traditional temperature monitoring methods, the system adopts radio frequency technology. The scheme mainly expounds the key technologies and switchgear implementation in the monitoring system research and discusses the feasibility of the system scheme through experiments. …”
Get full text

Jamming-resilient algorithm for underwater cognitive acoustic networks by Zixiang Wang, Fan Zhen, Senlin Zhang, Meiqin Liu, Qunfei Zhang

“…In the underwater cognitive acoustic networks, the anti-jamming problem is quite different from cognitive radio networks. It calls for an effective anti-jamming strategy in the cognitive acoustic channel access. …”
Get full text

Spiral Slotted Microstrip Antenna Design for 700 MHz Band Application by Ricardo Meneses González, R. Linares y Miranda, R. Leyva Hernández

“…This technological advance represents a radio mobile antenna design challenge because it is necessary to design an antenna whose dimensions must be small enough, which satisfies gain, resonance frequency, and bandwidth requirements and is of low cost.…”
Get full text

A Multicomponent Magnetic Proxy for Solar Activity by Harry P. Warren, Linton E. Floyd, Lisa A. Upton

“…We show that the first few principal components accurately reproduce widely used proxies for solar activity, such the the 10.7 cm radio flux and the Mg core‐to‐wing ratio. This suggests that these magnetic time series can be used as a proxy for irradiance variability for emission formed over a wide range of temperatures.…”
Get full text

Efficiency Improvements of Antenna Optimization Using Orthogonal Fractional Experiments by Yen-Sheng Chen, Ting-Yu Ku

“…The capability of orthogonal fractional experiments is demonstrated through three examples, including two tag antennas for radio-frequency identification (RFID) applications and one internal antenna for long-term-evolution (LTE) handheld devices. …”
Get full text

Interactive Visualization of the Printed Circuits Tracing Algorithms for Educational Purposes by D. O. Petrov

“…The use of the development is justified when giving lectures and conducting laboratory research on the theoretical foundations of automation systems for the design of radio electronic equipment and contributes to solving the complex problem of digitalization of the educational process with the help of visualization programs that allow you to observe the results of the algorithms they implement on various sets of initial data.…”
Get full text

Response of negative ion beamlet width and axis deflection to RF field in beam extraction region by Kenichi Nagaoka, Haruhisa Nakano, Taiga Hamajima, Ryoya Nakamoto, Katsuyoshi Tsumori, Masaki Osakabe, Masashi Kisaki, Kenji Miyamoto, Kazunori Takahashi, Ursel Fantz

“…Abstract Beam-divergence characteristics of single negative ion beamlet have been experimentally investigated with a superimposition of a controlled perturbation of a radio frequency wave (RF) field in a filament-arc discharge negative ion source. …”
Get full text

A Novel Audio Cryptosystem Using Chaotic Maps and DNA Encoding by S. J. Sheela, K. V. Suresh, Deepaknath Tandur

“…The various types of analysis revealed that the algorithm is suitable for narrow band radio communication and real-time speech encryption applications.…”
Get full text

Balancing the Potential Gauging Process Applied to Wave Propagation for Arbitrary Space-Times by Thomas Reum

“…This article addresses possibilities to compensate an unwanted side effect arising in the widely used gauging process of electrodynamic potentials due to mathematical conditions applied to describe propagating electromagnetic (EM) waves with a focus on radio frequency (RF). Previous studies have shown by means of guided propagation that phase velocities which differ from intuitive understanding occur for several components of potentials when deviating from a specific gauge determined by physical relationships. …”
Get full text

Recent Developments on Hybrid Time-Frequency Numerical Simulation Techniques for RF and Microwave Applications by Jorge F. Oliveira, José C. Pedro

“…Because of the modulated nature of radio frequency (RF) signals, the corresponding electronic circuits seem to operate in a slow time scale for the aperiodic information and another, much faster, time scale for the periodic carrier. …”
Get full text

Live video transmission optimization mechanism based on edge intelligence in high client-density environment by Xiaodan GU, Wenjia WU, Zhen LING

“…The traditional live video transmission optimization mechanism is deployed on the server side, which cannot quickly respond to the dynamic changes of the user’s wireless network environment.To address this problem, a live video transmission optimization mechanism based on edge intelligence called S-Edge was proposed.It was deployed on the OpenWrt-based wireless access point, and comprehensively utilized the wireless channel state information such as airtime utilization and signal-to-noise ratio to make intelligent decisions on terminal priority and transmission rate based on fuzzy logic theory.Furthermore, the active queue management with hierarchical token bucket and service demand-driven wireless transmission rate adaptive control technologies were introduced to realize the real-time scheduling of live video data.In order to verify the effectiveness and performance of the proposed mechanism, a high client-density environment was built through user clusters based on multi-radio interfaces in the real-world scenario.Experimental results show that S-Edge can significantly reduce the average delay and packet loss rate, which meets QoS requirements of live video transmission services in the high client-density environment.…”
Get full text

Indoor terminal localization technology using a single access point based on distributed MIMO networks by Ze LI, Jian ZOU, Zeng HUANG, Zengshan TIAN

“…Regarding the terminal localization in distributed MIMO networks, an indoor terminal localization system using a single access point (AP) based on distributed MIMO networks was proposed.Firstly, the AP’s antennas were arranged at different locations in the room, and the compressed sensing algorithm was used to estimate the angle of departure (AoD) and time of flight (ToF) of the receiving path on each antenna of the terminal device.Secondly, AoDs and ToFs of multiple paths were combined to establish a nonlinear localization model, and an improved Levenberg-Marquardt algorithm was used to solve the problem.Then, theoretical analysis has been examined for the factors that influence the localization error, and the criteria for the antenna layout was provided.Finally, electromagnetic simulation software was used to build simulation environment and conducted the simulation for system verification.Moreover, software-defined radio platforms were used to conduct practical tests.Both simulation and experimental results indicate that the performance of the proposed localization system is superior to existing single-AP localization systems based on natural multipath.…”
Get full text

Toward More Efficient and More Secure Last Mile Smart Metering and Smart Lighting Communication Systems with the Use of PLC/RF Hybrid Technology by Piotr Kiedrowski

“…Theoretical considerations, contained in the paper, are the result of the author's experience in the design, implementation, and operation of the last mile Smart Grid communication systems, realized in the narrowband PLC or 433/868 MHz radio technology. These communication systems were developed for data acquisition and distribution between specific terminals, which are Smart Meters or Smart Lanterns. …”
Get full text

EIRP Characterization of Electrically Large Wireless Equipment with Integrated Signal Generator in a Compact Environment by Soon-Soo Oh, Woo-Su Kim, Young-Hwan Lee

Get full text

Effect of Chlorides on Conductivity and Dielectric Constant in Hardened Cement Mortar: NDT for Durability Evaluation by Sunkook Kim, Joowon Kang, Sang-Hyo Lee, Yong Han Ahn

Get full text

Apprendre à philosopher au café : bilans et perspectives by Romain Jalabert

“…This research is made with the consultation of works, articles of magazines, official reports and radio archives covering the period from 1992 to 2010. …”
Get full text

An Intercomparison of GPS RO Retrievals with Colocated Analysis and In Situ Observations within Tropical Cyclones by Henry R. Winterbottom, Qingnong Xiao

“…Observations from four Global Position System (GPS) Radio Occultation (RO) missions: Global Positioning System/Meteorology, CHAallenging Minisatellite Payload, Satellite de Aplicaciones Cientificas-C, and Constellation Observing System for Meteorology, Ionosphere and Climate and Taiwan's FORMOsa SATellite Mission #3 (COSMIC/FORMOSAT-3) are collected within a 600 km radius and ±180 minute temporal window of all observed tropical cyclones (TCs) from 1995 to 2006 that were recorded in the global hurricane best-track reanalysis data set (Jarvinen et al. (1984); Davis et al. (1984)). …”
Get full text

Performance analysis of mixed FSO-RF transmission in UAV relay communication systems by Su XU, Ji ZHANG, Yanghua DIAO, Yuanying LIU, Yi ZHANG

“…A mixed free space optical (FSO)-radio frequency (RF) transmission was studied in the multiuser unmanned aerial vehicle (UAV)-aided terrestrial network.Specifically, a novel beamforming (BF) scheme was proposed based on the available statistical channel state information (CSI), and the outage performance of the considered system was analyzed.In this mixed framework, the link between the base station and the UAV employs the FSO technology, while aerial-terrestrial links use RF technology.To achieve the space division multiple access (SDMA) in RF links.First of all, the available statistical CSI was proposed, and a novel beamforming (BF) scheme was proposed to suppress the inter-user interference so that all the users can be served simultaneously.Then, based on the assumption that the FSO and RF links follow the Gamma-Gamma fading and Nakgami-m fading respectively, an analytical expression was derived for the outage probability (OP) of the considered system.Furthermore, the asymptotical OP expression in high signal-to-noise ratio regime was presented to evaluate the achievable diversity order.Finally, numerical results were given to confirm the validity of our theoretical analysis and the superiority of the proposed scheme.…”
Get full text

Development of world oil refining in the context of the coronavirus pandemic by A. P. Solomonov

Get full text