Results 61 to 70 of about 136,581 (191)

NLOS Identification and Mitigation Using Low-Cost UWB Devices

Sensors, 2019
Indoor location systems based on ultra-wideband (UWB) technology have become very popular in recent years following the introduction of a number of low-cost devices on the market capable of providing accurate distance measurements.
Valentín Barral, Carlos J. Escudero, José A. García-Naya, Roberto Maneiro-Catoira   +3 more
doaj   +1 more source

Graph neural network-based multi-metric performance modeling in urban multi-RAT wireless networks

ICT Express
As urban networks integrate heterogeneous radio access technologies (RATs), such as Wi-Fi and 5G/B5G, modeling performance becomes challenging due to interference, spatial variability, and propagation conditions.
Jun-Hwan Huh, Toshiki Inagaki, Jin Nakazato, Maki Arai, Kazuto Yano, Mikio Hasegawa   +5 more
doaj   +1 more source

Visualisasi Propagasi Gelombang Indoor Pada Wi-Fi 2,4 GHz [PDF]

, 2010
Wi-Fi network and the device worked on a wireless communication system (wireless communication system), eg a WLAN network. The most important part in wireless communications was the wave propagation.
Khasanah, Nur, Mahmudah, Hani'ah, Santoso, Tri Budi   +2 more
core  

28 GHz and 73 GHz Millimeter-Wave Indoor Propagation Measurements and Path Loss Models

, 2015
This paper presents 28 GHz and 73 GHz millimeter- wave propagation measurements performed in a typical office environment using a 400 Megachip-per-second broadband sliding correlator channel sounder and highly directional steerable 15 dBi (30 degrees ...
Deng, Sijia, Rappaport, Theodore S., Samimi, Mathew K.   +2 more
core   +1 more source

Experimental Multipath-Cluster Characteristics of 28-GHz Propagation Channel

IEEE Access, 2015
In this paper, a channel measurement campaign is introduced, which utilizes direction-scan-sounding to capture the spatial characteristics of 28-GHz wave propagation channels with 500-MHz sounding bandwidth in office environments.
Xuefeng Yin, Cen Ling, Myung-Don Kim
doaj   +1 more source

Measurement and Statistical Analysis of Distinguishable Multipaths in Underground Tunnels

International Journal of Antennas and Propagation, 2020
Compared with the line-of-sight (LOS) condition, the multipath effect is more serious in the non-line-of-sight (NLOS) condition. Therefore, the LOS and NLOS identification is necessary for the multipath analysis of signal propagation.
Junchang Sun, Shuai Ma, Hui Zhou, Chun Du, Shiyin Li   +4 more
doaj   +1 more source

Non LOS Conditions in Millimeter Wave Band and Proposed Multi-hop Protocol [PDF]

, 2004
In this paper, a detailed investigation of millimeter wave Non LOS (line of sight) conditions and proposed multi-hop protocol is described. Ratio under received power threshold is calculated by measuring the complex permittivity of a used desk and ...
Kuribayashi Nobuhiko, Nobuhiko Kuribayashi, Wuyi Yue, 岳 五一   +3 more
core   +1 more source

Quadruple-peaked spectral line profiles as a tool to constrain gravitational potential of shell galaxies

, 2012
Stellar shells observed in many giant elliptical and lenticular as well as a few spiral and dwarf galaxies, presumably result from galaxy mergers. Line-of-sight velocity distributions of the shells could, in principle, if measured with a sufficiently ...
Allgood, Arp, Auger, B. Jungwiert, Bailin, Balcells, Canalizo, Charmandaris, Churazov, Churazov, Coccato, Colbert, Coleman, Das, de Lorenzi, Deason, Duc, Dupraz, Dupraz, Fardal, Fardal, Fardal, Fukazawa, Gavazzi, Heisler, Helmi, Hernquist, Hernquist, Hernquist, Hernquist, Horellou, I. Ebrová, I. Stoklasová, James, Jing, K. Bartošková, Kaviraj, Kim, Krajnović, L. Jílková, M. Bílek, M. Křížek, Malin, Mandelbaum, Marino, Merrifield, Miskolczi, Nagino, Nierenberg, Norris, Nulsen, Prieur, Quinn, Rampazzo, Rampazzo, Romanowsky, Sanderson, Schiminovich, Schiminovich, Sikkema, Stickel, T. Skalická, Thomas, Trinchieri, Weijmans, Weijmans   +65 more
core   +1 more source

Maximizing Harvested Energy in mmWave IoT Networks: A Tractable Blockage-Aware RIS Framework

IEEE Access
This paper presents a novel analytical framework for energy harvesting (EH) in Reconfigurable intelligent surface (RIS) assisted mmWave IoT networks under realistic blockage conditions.
Jungsun Um, Jaehyun Park
doaj   +1 more source

A time difference of arrival/angle of arrival fusion algorithm with steepest descent algorithm for indoor non-line-of-sight locationing

International Journal of Distributed Sensor Networks, 2019
In complex indoor propagation environment, the non-line-of-sight error caused by various obstacles brings great error to node positioning. Choosing the appropriate signal transmission methods is important to improve node indoor positioning accuracy.
Chong Shen, Chengxiao Wang, Kun Zhang, Xianpeng Wang, Jing Liu   +4 more
doaj   +1 more source