Results 91 to 100 of about 231,801 (304)

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

Ultra‐Flexible Dual‐Band Organic Photodetectors for Visible and Near‐Infrared Sensing

Advanced Optical Materials, EarlyView.
An ultra‐flexible dual‐band organic photodetector with a total thickness of 5.6 µm for bio‐sensing is developed. It selectively detects visible and near‐infrared light with high sensitivity by switching the voltage. Peripheral oxygen saturation (SpO2) measurement is demonstrated using the device attached to a finger under a single light source by ...
Sachi Awakura, Hiroaki Jinno, Yusaku Tagawa, Ryota Fukuzawa, Masahito Takakuwa, Takao Someya, Tomoyuki Yokota   +6 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

Tunable Multifunctional Terahertz Coding Metasurface for Polarization Manipulation

Advanced Photonics Research, EarlyView.
Coding metasurfaces (CMs) offer versatile control over electromagnetic waves. Herein, a tunable multifunctional terahertz (THz) metasurface integrated with vanadium dioxide (VO2) is presented, enabling propagation‐phase manipulation of linearly polarized waves and hybrid‐phase control of circularly polarized waves.
Chunsheng Zhang, Tingnuo Pan, Xiao Zhang, Wenjia Li, Bo Lv, Yuxiang Li, Zheng Zhu, Chunying Guan, Wanying Liu, Xiaohan Jiang, Jinhui Shi   +10 more
wiley   +1 more source

Inverse‐Designed on‐Chip Terahertz Three‐Channel Mode and Wavelength Division Demultiplexer

Advanced Photonics Research, EarlyView.
An ultracompact terahertz demultiplexer is developed using a hybrid inverse design that combines genetic algorithms with topology optimization. The device enables simultaneous mode‐ and wavelength‐division multiplexing within a footprint smaller than two wavelengths.
Faqian Chong, Yulun Wu, Bingtao Gao, Shilong Li, Hongsheng Chen, Song Han   +5 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

Overview of Vehicle Optical Wireless Communications

IEEE Access, 2020
Effective information transmission between vehicles has become one of the solutions to improve road safety. Based on the huge advantages of optical wireless data transmission technology, this article summarizes the research status of unmanned vehicles in
Hongye Mei, Jupeng Ding, Jiong Zheng, Xifeng Chen, Wenwen Liu   +4 more
semanticscholar   +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

Toward Wireless Implantable Robotic Systems Driven by Magnetic Field for Personalized Therapy

Advanced Robotics Research, EarlyView.
Robotic materials are playing an increasingly vital role in enabling sensing and actuation at small scales. This perspective highlights recent advances in magnetic materials and magnetically actuated devices for wireless sensing, actuation, and energy harvesting toward implantable robotic systems for closed‐loop therapy.
Yusheng Wang, Ruijian Ge, Xiaoguang Dong
wiley   +1 more source

Maritime IoT: An Architectural and Radio Spectrum Perspective

IEEE Access, 2020
The concept of maritime Internet of Things is developed initially to modernize the maritime industries by the United Nations chartered International Maritime Organization under the name e-Navigation.
Jingjing Zhang, Michael Mao Wang, Tingting Xia, Lei Wang   +3 more
doaj   +1 more source