Results 61 to 70 of about 232,923 (285)

Sandwich Engineering Advances Ductile Thermoelectrics

Advanced Materials, EarlyView.
An innovative sandwich engineering is developed to realize n‐type Ag2(S, Se)‐Ag2Se ductile thermoelectric films, exhibiting a record‐high thermoelectric performance near room‐temperature among n‐type ductile semiconductors. The as‐fabricated in‐plane F‐TED achieves an exceptional power density of 26.5 W m−2 at a temperature difference of 50 K, ranking ...
Hao Wu, Xiao‐Lei Shi, Meng Li, Han Gao, Wei‐Di Liu, Min Zhu, Liang‐Cao Yin, De‐Zhuang Wang, Jingui Duan, Zhi‐Gang Chen, Qingfeng Liu   +10 more
wiley   +1 more source

5G base station prototyping: implementation possibilities in Russia [PDF]

ITM Web of Conferences, 2019
A brief overview of the development of 5G mobile communications in the world and in Russia is presented. 5G pilot projects in Russia are considered.
Ponomarev Oleg, Moiseichenkov Alexander, Bakhtin Alexander, Omelyanchuk Elena, Semenova Anastasia, Mikhailov Victor   +5 more
doaj   +1 more source

The Rise of Refractory Transition‐Metal Nitride Films for Advanced Electronics and Plasmonics

Advanced Materials Interfaces, EarlyView.
Transition‐metal nitrides (TMNs) are exceptional materials with high stability, biocompatibility, and semiconductor integration, which have been extensively employed in various fields. However, the epitaxial growth of TMN films remains a challenge. The absence of high‐quality TMNs limits the understanding of their condensed matter physics and hinders ...
Jiachang Bi, Ruyi Zhang, Xiong Yao, Yanwei Cao   +3 more
wiley   +1 more source

Massive MIMO in 5G: How Beamforming, Codebooks, and Feedback Enable Larger Arrays [PDF]

arXiv, 2023
Massive multiple-input multiple-output (MIMO) is an important technology in fifth generation (5G) cellular networks and beyond. To help design the beamforming at the base station, 5G has introduced new support in the form of flexible feedback and configurable antenna array geometries.
arxiv  

High‐Efficiency Multi‐Level Beam Switching with Single‐Gate Tunable Metasurfaces Based on Graphene

Advanced Optical Materials, EarlyView.
The growing demand for ultra‐fast telecommunications, autonomous driving, and futuristic technologies highlights the crucial role of active beam steering at the nanoscale. This work theoretically presents a multi‐level beam‐switching dielectric metasurface with a graphene layer for active tuning, addressing challenges associated with achieving high ...
Juho Park, Ju Young Kim, Sunghyun Nam, Min Seok Jang   +3 more
wiley   +1 more source

Asymptotic Performance Analysis of Massive MIMO Relay Systems With Multi-Pair Devices Over Correlated Fading Channels

IEEE Access, 2019
In this paper, we investigate a relay system with multi-pair single-antenna devices, where massive antenna array (also known as massive multiple-input-multiple-output (MIMO) technology) is deployed at the relay with low-complexity maximum-ratio combining/
Yi Wang, Rui Zhao, Yongming Huang, Chunguo Li, Zhengyu Zhu, Di Zhang, Zheng Chu, Wanming Hao   +7 more
doaj   +1 more source

Optical Wireless Communications with Metasurfaces: Current Status and Potential for Intelligent Communications

Advanced Photonics Research, EarlyView.
Optical wireless communications (OWCs) provide a promising alternative to spectrum‐congested microwave wireless communications. Recently, the use of metasurfaces with sub‐wavelength features for dynamic beam steering, beam manipulation, and spatial or optical‐angular‐momentum mode generation, conversion, and multiplexing in OWCs is proposed and ...
Ke Wang, Chengwei Fang, Md Osman Ali, Xiaojun Chen, Safa Alghadi, Shuo Li, Jiayuan He, Sithamparanathan Kandeepan   +7 more
wiley   +1 more source

Sparse Signal Processing Concepts for Efficient 5G System Design

, 2015
As it becomes increasingly apparent that 4G will not be able to meet the emerging demands of future mobile communication systems, the question what could make up a 5G system, what are the crucial challenges and what are the key drivers is part of ...
Boche, Holger, Jung, Peter, Strohmer, Thomas, Wunder, Gerhard   +3 more
core   +1 more source

Microwave Monitoring by Compact Carbon Nanotube Photo‐Thermoelectric Sensors Beyond the Diffraction Limit Toward Ultrabroadband Non‐Destructive Inspections

Advanced Sensor Research, EarlyView.
This work overcomes long‐standing crucial technical difficulties in miniaturizing micro‐wave detectors, caused by the longer‐wavelength diffraction limit, with carbon nanotube (CNT) film photo‐thermoelectric sensors. The CNT film sensor exhibits sensitive micro‐wave detection operations with signal‐to‐noise ratios over 1400 at compact device sizes ...
Qi Zhang, Honghao Li, Ryo Koshimizu, Norika Takahashi, Yuya Kinoshita, Asumi Sano, Junyu Jin, Hiroki Okawa, Yuto Matsuzaki, Daiki Shikichi, Yukio Kawano, Kou Li   +11 more
wiley   +1 more source

Using 5G in Smart Cities: A Systematic Mapping Study [PDF]

arXiv, 2022
5G is the fifth generation wireless network, with a set of characteristics, e.g., high bandwidth and data rates. The scenarios of using 5G include enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC), and ultra-Reliable and Low-Latency Communications (uRLLC). 5G is expected to support a wide variety of applications. We conducted
arxiv