Frequency Dependence of 2–5 GHz Polarized UWB Channel Parameters in Office Environment

2012 ◽  
Vol 60 (6) ◽  
pp. 2970-2979 ◽  
Author(s):  
Concepcion Garcia-Pardo ◽  
Jose-María Molina-Garcia-Pardo ◽  
Andres Garrido-Cervantes ◽  
John Danson Muhehe ◽  
Leandro Juan-Llacer
Keyword(s):  
Frequency Dependence ◽  
Office Environment ◽  
Channel Parameters ◽  
5 Ghz ◽  
Uwb Channel

scholarly journals Experimental Characterization of Ultra-Wideband Channel Parameter Measurements in an Underground Mine

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
B. Nkakanou ◽  
G. Y. Delisle ◽  
N. Hakem
Keyword(s):  
Underground Mining ◽  
Path Loss ◽  
Measurement Procedure ◽  
Ultra Wideband ◽  
Small Scale ◽  
Scale Parameters ◽  
Channel Parameter ◽  
Channel Parameters ◽  
Uwb Channel

Experimental results for an ultra-wideband (UWB) channel parameters in an underground mining environment over a frequency range of 3 GHz to 10 GHz are reported. The measurements were taken both in LOS and NLOS cases in two different size mine galleries. In the NLOS case, results were acquired for different corridor obstruction angles. The results were obtained during an extensive measurement campaign in the UWB frequency, and the measurement procedure allows both the large- and small-scale parameters such as the path loss exponent, coherence bandwidth, and so forth, to be quantified. The capacity of the UWB channel as a function of the physical depth of the mine gallery has also been recorded for comparison purposes.

Comparisons of Channel Parameters and Models for Urban Microcells at 2 GHz and 5 GHz [Wireless Corner]

2014 ◽  
Vol 56 (6) ◽  
pp. 260-276 ◽  
Author(s):  
Xiongwen Zhao ◽  
Balla Moussa Coulibaly ◽  
Xiaolin Liang ◽  
Shu Li ◽  
Jingchun Li ◽  
...  
Keyword(s):  
Channel Parameters ◽  
5 Ghz

Frequency dependence on bias current in 5 GHz CMOS VCOs: impact on tuning range and flicker noise upconversion

2002 ◽  
Vol 37 (8) ◽  
pp. 1003-1011 ◽  
Author(s):  
S. Levantino ◽  
C. Samori ◽  
A. Bonfanti ◽  
S.L.J. Gierkink ◽  
A.L. Lacaita ◽  
...  
Keyword(s):  
Frequency Dependence ◽  
Tuning Range ◽  
Flicker Noise ◽  
Bias Current ◽  
5 Ghz

scholarly journals Large-Scale Fading and Time Dispersion Parameters of UWB Channel in Underground Mines

2008 ◽  
Vol 2008 ◽  
pp. 1-10 ◽  
Author(s):  
Abdellah Chehri ◽  
Paul Fortier ◽  
Pierre Martin Tardif
Keyword(s):  
Mobile Communications ◽  
Path Loss ◽  
Worker Safety ◽  
Ultra Wideband ◽  
Underground Mines ◽  
Delay Spread ◽  
Rms Delay Spread ◽  
5 Ghz ◽  
Mean Excess Delay ◽  
Uwb Channel

RF channel measurements in underground mines have important applications in the field of mobile communications for improving operational efficiency and worker safety. This paper presents an experimental study of the ultra wideband (UWB) radio channel, based on extensive sounding campaigns covering the underground mine environment. Measurements were carried out in the frequency band of 2–5 GHz. Various communication links were considered including both line-of-sight (LOS) and non-LOS (NLOS) scenarios. In this paper, we are interested in more details of the variations of the RMS delay spread and mean excess delay with Tx/Rx separation, and the variation of RMS with mean excess. The distance dependency of path loss and shadowing fading statistics is also investigated. To give an idea about the behaviour of UWB channel in underground mines, a comparison of our approach with other published works is given including path loss exponent, shadow fading variance, mean excess delay, and RMS delay spread.

Dreamlike and Playful Virtual Environments to Inspire Children’s Divergent Thinking

2020 ◽  
pp. 1-11
Author(s):  
Jérôme Guegan ◽  
Claire Brechet ◽  
Julien Nelson
Keyword(s):  
Virtual Environments ◽  
Divergent Thinking ◽  
Idea Generation ◽  
Combined Processes ◽  
Office Environment ◽  
School Aged Children

Abstract. Computers have long been seen as possible tools to foster creativity in children. In this respect, virtual environments present an interesting potential to support idea generation but also to steer it in relevant directions. A total of 96 school-aged children completed a standard divergent thinking task while being exposed to one of three virtual environments: a replica of the headmistress’s office, a replica of their schoolyard, and a dreamlike environment. Results showed that participants produced more original ideas in the dreamlike and playful environments than in the headmistress’s office environment. Additionally, the contents of the environment influenced the selective exploration of idea categories. We discuss these results in terms of two combined processes: explicit references to sources of inspiration in the environment, and the implicit priming of specific idea categories.

Window design for a professional workstation in the office environment

1984 ◽  
Author(s):  
J. Thomas Murray ◽  
Markku T. Hakkinen ◽  
James D. Mackraz
Keyword(s):  
Office Environment ◽  
Window Design
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