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Reconfigurable Holographic Surface: A New Paradigm for Ultra-Massive MIMO

IEEE Transactions on Cognitive Communications and networking 2025年

作者： Di, Boya Zhang, Hongliang Han, Zhu Zhang, Rui Song, Lingyang Peking University School of Electronics China University of Houston Department of Electrical and Computer Engineering HoustonTX United States Kyung Hee University Department of Computer Science and Engineering Seoul Korea Republic of The Chinese University of Hon g Kong School of Science and Engineering Guangdong Shenzhen China National University of Singapore Department of Electrical and Computer Engineering Singapore Singapore Peking University Shenzhen Graduate School School of Electronic and Computer Engineering China

Evolving from massive multiple-input multiple-output (MIMO) in current 5G communications, ultra-massive MIMO emerges as a seminal technology for fulfilling more stringent requirements of future 6G communications. However, widely-utilized phased arrays relying on active components make the implementation of ultra-massive MIMO in practice increasingly prohibitive from both cost and power consumption perspectives. In contrast, the development of reconfigurable holographic surface (RHS) provides a new paradigm to solve the above issue without the need of costly hardware components. By leveraging the holographic principle, the RHS serves as an ultra-thin and lightweight surface antenna integrated with the transceiver, which is a promising alternative to phased arrays for realizing ultra-massive MIMO. In this paper, we provide a comprehensive overview of the RHS, especially the RHS-aided communication and sensing. We first describe the basic concepts of RHS, and introduce its working principle and unique practical constraints. Moreover, we show how to utilize the RHS to achieve cost-efficient and high-performance wireless communication and sensing, and introduce the key technologies. In particular, we present the implementation of RHS with a wireless communication prototype, and report the experimental measurement results based on it. Finally, we outline some open challenges and potential future directions in this area. © 2015 IEEE.

关键词： Antenna phased arrays

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Micropinch formation dynamics in X pinches

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Physical Review E 2024年第3期110卷 L033202页

作者： A. T. Elshafiey N. G. Chalmers D. A. Hammer Los Alamos New Mexico 87544 United States of America School of Electrical and Computer Engineering (ECE)

High temporal resolution x-ray streak camera studies of micropinch formation in Cu hybrid x pinches reveal key plasma conditions. Analysis of Ne-like Cu lines indicate an average electron temperature of about 200 eV and 4.5×1028m−3 electron density. The spectra suggest that the electron temperature jumps to about 1 keV, inferred from the continuum and the postcontinuum line emission that includes Li-like Cu lines. There is no sign of a rapid temperature change or a substantial surge in radiation emission during the 200 ps precontinuum x-ray burst, suggesting that the radiative collapse process does not play a major role in micropinch formation. Two-dimensional extended Magnetohydrodynamic (MHD) simulations, coupled to a collisional-radiative spectral analysis code, suggest the significance of the rapid radial implosion of high-temperature, low-density plasma, the axial outflow, and the dynamic plasma pressure in micropinch formation.

关键词： Atomic spectra Current drive High-energy-density plasmas High-pressure, high-current plasma production Magnetohydrodynamics Plasma discharges Plasma instabilities X-ray generation in plasmas

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Hybrid Coded-Uncoded Caching in Multi-Access networks with Non-uniform Demands

arXiv

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arXiv 2024年

作者： Sheshjavani, Abdollah Ghaffari Khonsari, Ahmad Moradian, Masoumeh Shariatpanahi, Seyed Pooya Hassanpour, Seyedeh Bahereh School of Electrical and Computer Engineering College of Engineering University of Tehran Iran Iran

To address the massive growth of data traffic over cellular networks, increasing spatial reuse of the frequency spectrum by the deployment of small base stations (SBSs) has been considered. For rapid deployment of SBSs in the networks, caching popular content along with new coded caching schemes are *** maximize the cellular network's capacity, densifying it with small base stations is inevitable. In ultra-dense cellular networks, coverage of SBSs may overlap. To this aim, the multi-access caching system, where users potentially can access multiple cache nodes simultaneously, has attracted more attention in recent years. Most previous works on multi-access coded caching, only consider specific conditions such as cyclic wraparound network topologies. In this paper, we investigate caching in ultra-dense cellular networks, where different users can access different numbers of caches under non-uniform content popularity distribution, and propose Multi-Access Hybrid coded-uncoded Caching (MAHC). We formulate the optimization problem of the proposed scheme for general network topologies and evaluate it for 2-SBS network scenarios. The numerical and simulation results show that the proposed MAHC scheme outperforms optimal conventional uncoded and previous multiaccess coded caching (MACC) schemes. © 2024, CC BY-NC-ND.

关键词： Base stations

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Design and Analysis of Deep Learning based Water Potability Prediction

Design and Analysis of Deep Learning based Water Potability ...

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2023 International Conference on Self Sustainable Artificial Intelligence Systems, ICSSAS 2023

作者： Arumugam, M. Vijayakumar, P. Kannan, A.C. Velmurugan, J. Arun, G. Rohith Bhat, C. Kongu Engineering College Department of Computer Technology - Pg Perundurai India Kongu Engineering College Department of Master of Computer Applications Tamil Nadu Perundurai638060 India Psna College of Engineering and Technology Department of Electrical and Electronics Engineering Dindigul624622 India Erode Sengunthar Engineering College Department of Artificial Intelligence and Data Science Thuduppathi638057 India Saveetha School of Engineering Simats Department of Computer Science and Engineering Chennai India

ISBN: (纸本)9798350300857

According to the United Nations, having access to clean water for consumption is a fundamental human right. General Assembly in 2010. The importance of safe drinking water cannot be overstated. Unsafe drinking water access is a significant public health concern, especially in poor nations. In many regions of the world, waterborne illnesses including cholera, typhoid fever, and dysentery are important causes of illness and death. These diseases are especially dangerous for children, who are more vulnerable to their effects. In addition, a lack of access to clean drinking water can result in other health issues like stunted growth and malnutrition. Access to safe drinking-water is also a key component of effective policy for health protection at all levels, whether it is at the national, regional, or local level. Policies aimed at improving access to safe drinking-water can include measures such as water quality testing, water treatment, and the provision of clean water sources. Investments in water supply and sanitation can have a positive economic impact, especially in areas with inadequate access to clean drinking water. The costs of implementing the treatments may be outweighed by the reductions in unfavorable health impacts and medical expenses that may result from these investments. In conclusion, having access to clean drinking water is crucial for encouraging wellness, reducing waterborne illnesses, and raising standard of living in general. The input to the DNN could be the various water quality parameters, such as pH, hardness, chloride content, and total dissolved solids, while the output would be a binary classification indicating whether the water is potable or not. The DNN would need to be trained on a large and diverse dataset of water samples to accurately classify new samples. © 2023 IEEE.

关键词： Potable water

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Developing 3D CAD Models and Low-Cost Hardware for Learning New Topics in Telecommunication Laboratories

Developing 3D CAD Models and Low-Cost Hardware for Learning ...

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International Symposium on Telecommunications, IST

作者： Jamal Kazazi Mahmoud Kamarei School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran

ISBN: (数字)9798350356250

ISBN: (纸本)9798350356267

Amidst the COVID-19 pandemic, the learning and teaching of various laboratory skills encountered numerous challenges. In electrical engineering, the field of telecommunication involving fields and waves requires the creation of different devices and their subsequent measurement in laboratory settings. In the undergraduate curriculum of this field, the antenna and microwave laboratories play a crucial role in acquainting students with tangible devices, their operational mechanisms, measurement specifications, and the utilization of measurement equipment. To facilitate the comprehension of courses related to microwave devices and antenna design, a compilation of 3D designs was devised to simulate performance alongside theoretical concepts. This extensive collection includes components like transmission lines, waveguides, couplers, filters, circulators, antennas, and more. It serves as a valuable resource for traditional in-person theory classes and provides a foundation for research projects undertaken by graduate students. It can be used to generate a database for use in designs with the help of machine learning, too. Subsequently, several pieces of educational hardware were designed and constructed to address emerging topics, including automotive radar, software-defined radio, and spread spectrum telecommunications.

关键词： Microwave antennas Microwave measurement Antenna measurements Solid modeling Three-dimensional displays Databases Transmission line measurements Microwave theory and techniques Microwave circuits Microwave filters

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Single-Frequency Microwave Measuring System for Liquid Characterization for Point-of-Care Testing

Single-Frequency Microwave Measuring System for Liquid Chara...

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Iranian Conference on electrical engineering (ICEE)

作者： Saeed Javadizadeh Mohammadjavad Bouloorchi Tabalvandani Majid Badieirostami Mahmoud Shahabadi School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran

ISBN: (数字)9798350376340

ISBN: (纸本)9798350376357

Microwave sensors are suitable candidates for point-of-care (POC) devices due to the advantages they offer over other sensing methods. These sensors are low cost, sensitive, small, and reliable. However, the need to use bulky and expensive vector network analyzers limits their application in POC systems. Here we present a simple measuring system to tackle this problem, allowing the integration of microwave sensors with POC testing. The performance of the system is validated by measuring solutions of water-glucose and water-isopropyl alcohol with different concentrations. It is shown that the system can distinguish different solutions by measuring the phase shift and power attenuation in transmission coefficient of a microwave sensor.

关键词： Microwave measurement Microwave integrated circuits Sensitivity Costs Point of care Microwave sensors Vectors

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Nesterov-Type Accelerated ADMM (N-ADMM) with Adaptive Penalty for Three-Phase Distributed OPF under Non-Ideal Data Transfer Scenarios 3

Nesterov-Type Accelerated ADMM (N-ADMM) with Adaptive Penalt...

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3rd IEEE International Conference on Smart Technologies for Power, Energy and Control, STPEC 2023

作者： Paul, Subho Ganguly, Biswarup Chatterjee, Soumya Washington State University School of Electrical Engineering and Computer Science PullmanWA United States National Institute of Technology Silchar Department of Electrical Engineering Assam Silchar India National Institute of Technology Durgapur Electrical Engineering Department WB Durgapur India

ISBN: (纸本)9798350304732

In the smart grid era, distributed algorithms are paving their way to solve optimal power flow (OPF) problems in lesser computation complexity. In distributed algorithms, the original centralized problem is decomposed into multiple subproblems and they are solved in parallel by enabling coordination among them. In this context, the alternating direction method of multiplier (ADMM) has proved itself superior over other methods and is used extensively for power networks. However, vanilla ADMM completes a large number of macro-iterations (approx 10 2) before convergence. Therefore, to reduce the number of iterations and the solution time, in this article the concept of predictor-corrector acceleration, proposed by Nesterov, is merged with the vanilla ADMM for solving three phase OPF problem of unbalanced distribution networks. The convergence speed is further improved by utilizing the concept of adaptive penalty. The efficacy of the proposed Nesterov-type accelerated ADMM (N-ADMM) with adaptive penalty is established by implementing on IEEE 123 bus test system. Again, two non-ideal data transfer scenarios, viz. bad and noisy data transfer, are modeled to show their impacts on the N-ADMM algorithm. © 2023 IEEE.

关键词： Adaptive penalty Nesterov-type accelerated ADMM non-ideal data transfer three-phase linear OPF

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Advancing Electric Vehicle Motor Design Optimization - Overview of a Novel Approach for Fault Characterization

Advancing Electric Vehicle Motor Design Optimization - Overv...

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electrical Machines and Drives (ICEMD), International Conference on

作者： Jawad Faiz Mohammad Mahdi Nassiri School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran

ISBN: (数字)9798331507510

ISBN: (纸本)9798331507527

Nowadays, the worldwide automotive industry has placed great emphasis on the expansion of electric vehicles (EVs), leaving no room for doubt. Data from numerous esteemed research institutions and statistical centers unequivocally demonstrate the environmental benefits of these vehicles. The distinguishing factors of EVs are their electric power units and propulsion systems, which set them apart from combustion engine-based vehicles. Currently, comprehensive studies are being conducted on various aspects of EVs, including design and development, materials, production, processing, operation, and recycling. Research areas include charging technologies, the development of reliable and high-capacity rechargeable cells, the design of lightweight and powerful electric motors, and the use of improved devices in power electronics circuits. This paper aims to investigate an approach for design optimization of electric motors employed in EVs. These proposed solutions aim to strengthen the mechanical, electromagnetic, and thermal structure of these motors, enabling them to withstand expected stresses and minimizing the occurrence of faults.

关键词： Transportation industry Propulsion Reliability engineering Electric vehicles Mathematical models Combustion Circuit faults Thermal stresses Electric motors Design optimization

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Partial Discharge Classification With 1D Convolutional Neural network 14

Partial Discharge Classification With 1D Convolutional Neura...

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14th International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2024

作者： Cheypoca, Thepjit Promphanich, Wiboon Thway, Aung Ye Hankae, Angelina Phimpissada Jeenmuang, Siwakorn Pattanadech, Norasage School of Engineering King Mongkut's Institute of Technology Ladkrabang Instrumentation and Control Engineering Dept. Bangkok Thailand School of Engineering King Mongkut's Institute of Technology Ladkrabang Computer Engineering Dept. Bangkok Thailand School of Engineering King Mongkut's Institute of Technology Ladkrabang Electrical Engineering Dept. Bangkok Thailand School of Engineering King Mongkut's Institute of Technology Ladkrabang Mechatronics Engineering Dept. Bangkok Thailand

ISBN: (纸本)9798350374605

This paper introduces a novel approach for classifying with the 1D Convolutional Neural network model for partial discharge patterns, that consists of corona discharge, surface discharge and internal discharge. The PD measuring circuit suggested in IEC 60270:2000 is used to record Partial discharge signals. Independent parameters such as phase and charge of PD patterns were recorded. The Artificial Neural network for the classification model was constructed. Moreover, 2×1D CNN feature extraction was utilized to reduce the curse of dimensionality in the dense layer of the proposed PD classification model. 80% of the recorded data will be used as a training data and 20% recorded data was used for testing of the classification models. Impacts of neuron numbers and network architecture on the PD classification performance will be observed. © 2024 IEEE.

关键词： Convolutional neural networks

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Multi-dimensional Security Range Query for Industrial IoT

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computers, Materials & Continua 2022年第7期72卷 157-179页

作者： Abdallah Abdallah Ayman A.Aly Bassem F.Felemban Imran Khan Ki-Il Kim School of Engineering Technology Al Hussein Technical University(HTU)Amman11831Jordan Department of Mechanical Engineering College of EngineeringTaif UniversityTaif21944Saudi Arabia Department of Electrical Engineering University of Engineering and Technology PeshawarPakistan Department of Computer Science and Engineering Chungnam National UniversityDaejeon34134Korea

The Internet of Things(IoT)has allowed for significant advancements in applications not only in the home,business,and environment,but also in factory *** Internet of Things(IIoT)brings all of the benefits of the IoT to industrial contexts,allowing for a wide range of applications ranging from remote sensing and actuation to decentralization and *** expansion of the IoT has been set by serious security threats and obstacles,and one of the most pressing security concerns is the secure exchange of IoT data and fine-grained access control.A privacypreserving multi-dimensional secure query technique for fog-enhanced IIoT was proposed in light of the fact that most existing range query schemes for fog-enhanced IoT cannot provide both multi-dimensional query and privacy *** query matrix was then decomposed using auxiliary vectors,and the auxiliary vectorwas then processed usingBGNhomomorphic encryption to create a query ***,the query trapdoor may be matched to its sensor data using the homomorphic computation used by an IoT device *** the application of particular auxiliary vectors,the spatial complexity might be efficiently *** homomorphic encryption property might ensure the security of sensor data and safeguard the privacy of the user’s inquiry *** results of the experiments reveal that the computing and communication expenses are modest.

关键词： Internet of things data security ciphertext privacy encryption

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