Results 71 to 80 of about 351,545 (187)
Near-infrared spectropolarimetry of a delta-spot
, 2014 Sunspots harboring umbrae of both magnetic polarities within a common penumbra (delta-spots) are often but not always related to flares. We present first near-infrared (NIR) observations (Fe I 1078.3 nm and Si I 1078.6 nm spectra) obtained with the ...
Balthasar, H. +4 more
core +1 more source
Optical and Quantum ElectronicsAbstract Optical Wireless Communications (OWCs) are capable of handling large data rate in the Internet of Underwater Things (IoUT) at low latency to be suitable for real time image and video applications. This paper presents communication link feasibility via link budget to determine the link communication range for three types of line-of ...
M. Mokhtar Zayed +3 more
openaire +1 more source
A Novel Three-Dimensional Algorithm Based on Practical Indoor Visible Light Positioning
IEEE Photonics Journal, 2019 With the increased demand of multiple information, positioning technology raises lots of attention in many fields, including military, emergency assistance, and tracking for vehicles.
H.-X. Zhao, J.-T. Wang
doaj +1 more source
Non-Line-of-Sight Identification Based on Unsupervised Machine Learning in Ultra Wideband Systems
IEEE Access, 2019 Identification of line-of-sight (LOS) and non-line-of-sight (NLOS) propagation conditions is very useful in ultra wideband localization systems. In the identification, supervised machine learning is often used, but it requires exorbitant efforts to ...
Jiancun Fan, Ahsan Saleem Awan
doaj +1 more source
IEEE AccessThe accurate distinction between line-of-sight (LOS) and non-line-of-sight (NLOS) propagation channels is paramount for precise distance measurement within ultra-wideband (UWB) indoor localization systems.
Ammar Fahem Majeed +4 more
doaj +1 more source
IEEE Access, 2019 We present robust range-based localization algorithms for which range measurements are used to estimate the location parameter. Non-line-of-sight (NLOS) propagation of signal can deteriorate the estimation performance severely in the indoor and crowded ...
Chee-Hyun Park, Joon-Hyuk Chang
doaj +1 more source
IEEE AccessThe rapid advancements in wireless communications have prompted a surge in mobile data traffic, necessitating innovative solutions for 5G and beyond.
Najwan M. Swadi +2 more
doaj +1 more source
Remote SensingMulti-view inverse synthetic aperture radar (ISAR) image sequences provide multi-dimensional observation information about space targets, enabling precise attitude estimation that is fundamental to both non-cooperative target monitoring and critical ...
Junzhi Li +3 more
doaj +1 more source
Performance Analysis of OFDM 60GHz System and SC-FDE 60GHz System
MATEC Web of Conferences, 2016 In this paper, the performance of 60GHz wireless communication system with SC and OFDM is studied, the models of OFDM 60GHz system and SC 60GHz frequency domain equalization (SC-FDE) system are established, and the bit error rate (BER) performance of ...
Han Xueyan +3 more
doaj +1 more source
Zhongguo Jianchuan Yanjiu, 2019 [Objectives]To solve lumped uncertainties of Unmanned Surface Vessels(USV)caused by system modeling errors and parameter perturbations, and path tracking problem of the model including non-zero non-diagonal terms and controller input saturation,[Methods]
Yu Yalei, Su Rongbin, Feng Xu, Guo Chen
doaj +1 more source