Results 31 to 40 of about 444,651 (161)

Joint Beamforming and Trajectory Optimization for Intelligent Reflecting Surfaces-Assisted UAV Communications

open access: yesIEEE Access, 2020
Unmanned aerial vehicle (UAV) and intelligent reflecting surface (IRS) are anticipated to be widely applied for improving the spectrum and energy efficiency in the forthcoming wireless communication systems.
Linghui Ge   +4 more
doaj   +1 more source

A rapid fingerprint positioning method based on deep convolutional neural network for MIMO-OFDM systems

open access: yesUrban Lifeline
The combination of fingerprint positioning and 5G (the 5th Generation Mobile Communication Technology) offers broader application prospects for indoor positioning technology, but also brings challenges in real-time performance.
Chenlin He   +6 more
doaj   +1 more source

Energy Efficiency Optimization in Massive MIMO Secure Multicast Transmission

open access: yesEntropy, 2020
Herein, we focus on energy efficiency optimization for massive multiple-input multiple-output (MIMO) downlink secure multicast transmission exploiting statistical channel state information (CSI). Privacy engineering in the field of communication is a hot
Bin Jiang   +5 more
doaj   +1 more source

Performance of Ship-Based QKD Under the Influence of Sea-Surface Atmospheric Turbulence

open access: yesPhotonics
There are numerous studies on the effects of ocean turbulence on wireless optical communications and on satellite–ground quantum key distribution (QKD); however, there are few studies on the impact of near sea-surface turbulence on ship-based QKD ...
Gui-Ying Jiang   +7 more
doaj   +1 more source

Indoor Positioning for Multiphotodiode Device Using Visible-Light Communications

open access: yesIEEE Photonics Journal, 2016
With the widespread use of light-emitting diodes (LEDs) for lighting, their ability to support communications through visible light has become promising for various wireless applications.
Wei Xu   +4 more
doaj   +1 more source

Energy Optimization Algorithms for MIMO-OFDM Based Downlink C-RAN System

open access: yesIEEE Access, 2019
In this paper, we consider a green communication design in a multiple-input-multiple-output orthogonal frequency-division multiplexing-based downlink cloud radio access network system with per-user quality of service constraints and remote antenna units (
Ruohong Guo   +4 more
doaj   +1 more source

Energy Efficiency and Spectral Efficiency Tradeoff in Massive MIMO Multicast Transmission with Statistical CSI

open access: yesEntropy, 2020
As the core technology of 5G mobile communication systems, massive multi-input multi-output (MIMO) can dramatically enhance the energy efficiency (EE), as well as the spectral efficiency (SE), which meets the requirements of new applications.
Bin Jiang   +5 more
doaj   +1 more source

Editorial: Evidence-based science communication in the COVID-19 era

open access: yesFrontiers in Communication, 2023
Alexander Gerber, Alexander Gerber
doaj   +1 more source

Towards an understanding of the multilevel factors associated with maternal health care utilization in Uttar Pradesh, India

open access: yesGlobal Health Action, 2017
Background: This paper explores the multilevel factors associated with maternal health utilization in India’s most populous state, Uttar Pradesh. 3 key utilization practices: registration of pregnancy, receipt of antenatal care, and delivery at home are ...
Sanjeev Sridharan   +6 more
doaj   +1 more source

Visualization of Modern Political Space: Research Priorities

open access: yesПроблемы постсоветского пространства, 2020
In modern humanitarian studies and research in a number of social sciences, interpretation of visual data is often used. However, in some cases, it is able to make a negative adjustment in the methodology and research methods, which is a consequence of ...
M. G. Goguadze
doaj   +1 more source

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