Results 51 to 60 of about 7,034 (308)

Network-Based Video Quality Assessment for Encrypted HTTP Adaptive Streaming

IEEE Access, 2018
End-to-end encryption brings new challenges for mobile network operators to obtain key quality indicators (KQIs) of the HTTP adaptive streaming (HAS), which are vital for quality of experience (QoE) of the end users.
Shuang Tang, Xiaowei Qin, Guo Wei
doaj   +1 more source

Magnetic Field Driven Microrobot Based on Hydrogels

Advanced Robotics Research, EarlyView.
Hydrogel‐based magnetic microrobots synergize remote magnetic control with the biocompatibility of flexible hydrogels, emerging as promising tools for minimally invasive biomedicine. This enables remotely controllable, untethered navigation within complex biological microenvironments.
Juncai Song, Yubing Guo
wiley   +1 more source

An Adaptive Threshold Updating Algorithm for PMT-Based Ultraviolet Communication

IEEE Photonics Journal
To address varying environmental conditions, this paper proposes an adaptive threshold updating algorithm for photomultiplier tube (PMT) signals in ultraviolet (UV) communication.
Jingyang Chen, Yuan Ren, Fei Long, Lingfeng Li, Weijie Liu, Jian Chen, Dezhi Yang, Chen Gong, Zhengyuan Xu   +8 more
doaj   +1 more source

Experimental Indoor Visible Light Positioning Systems With Centimeter Accuracy Based on a Commercial Smartphone Camera

IEEE Photonics Journal, 2018
We consider indoor positioning based on visible light where the receiver adopts a commercial smartphone camera. Two positioning approaches are proposed, either the light emitting diode (LED) positions are known or not.
Jiaojiao Xu, Chen Gong, Zhengyuan Xu
doaj   +1 more source

Waveguide Photoactuators: Materials, Fabrication, and Applications

Advanced Robotics Research, EarlyView.
Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi, Hemin Pan, Yang Zong, Yongfeng Mei, Jizhai Cui   +4 more
wiley   +1 more source

Experimental Verification of a Multiuser Detection Technique for Asynchronous UOWC Systems

IEEE Photonics Journal
In this paper, a multiuser detection technique is proposed and experimentally verified in underwater optical wireless communication (UOWC) under dynamic channel conditions, which incorporates subspace-based delay estimation and decorrelating multiuser ...
Weijie Liu, Xiaorui Chen, Nuo Huang, Zhengyuan Xu   +3 more
doaj   +1 more source

Spatial‐Wavelength Multiplexing Error‐Controlled Photonic Analog Computing System

Advanced Science, EarlyView.
A novel photonic integrated circuit prototype implementing the concept of general‐purpose analog computing and demonstrate its capability in radio frequency applications. The chip features a multichannel architecture and performs fully optical analog computation with frequency‐domain parallel processing. An FPGA‐based error‐correction algorithm aims to
Tao Zhu, Bowen Zhu, Shicheng Zhang, Keren Li, Xianchen Wu, Yazhi Pi, Jie Yan, Daigao Chen, Bingli Guo, Xi Xiao, Lei Wang, Xiaochuan Xu, Xuwei Xue, Shanguo Huang, Zizheng Cao, Shaohua Yu   +15 more
wiley   +1 more source

Photonic Time Crystals and Time‐Varying Electromagnetic Metamatter: A New Direction for Ultrafast Tunable Photonic and Microwave Materials and Devices

Advanced Science, EarlyView.
Photonic time crystals (PTCs) are systems in which electromagnetic parameters are modulated periodically in time, producing momentum bandgaps via temporal scattering rather than spatial Bragg processes. This review examines the theoretical frameworks, modeling, and computational tools for time‐varying media, and summarizes experimental demonstrations ...
Ranjan Kumar Patel, Shriram Ramanathan, Ronald P. Jenkins, Michael J. Carter   +3 more
wiley   +1 more source

Information Theoretic Limits of Improved ACO-OFDM Receivers in Optical Intensity Channels With Time Dispersion

IEEE Open Journal of the Communications Society
From an information-theoretic perspective, we investigate performance of asymmetrically clipped optical OFDM (ACO-OFDM) in intensity modulated optical wireless systems.
Xiaozhen Liu, Jing Zhou, Wenyi Zhang
doaj   +1 more source

Integrated transceivers for optical wireless communications

IEEE Journal of Selected Topics in Quantum Electronics, 2005
Line-of-sight free-space optical links can provide extremely high bandwidth communications, but this usually requires that transmitter and receiver are precisely aligned. In order to allow terminals to be mobile, links must be able to track users within their field of view so that the link is maintained.
O'Brien, D, Faulkner, G, Zyambo, E, Jim, K, Edwards, D, Stavrinou, P, Parry, G, Bellon, J, Sibley, M, Lalithambika, V, Joyner, V, Samsudin, R, Holburn, D, Mears, R   +13 more
openaire   +1 more source