A Small and Angle-Diversity Antenna Mountable for the Small Drone

2021 ◽  
Author(s):  
Yejune Seo ◽  
Munsu Jeon ◽  
Junghyun Cho ◽  
Yejin Lee ◽  
Jiyeon Jang ◽  
...  
Keyword(s):  
Angle Diversity ◽  
Diversity Antenna

scholarly journals Interference Mitigation for Visible Light Communications in Underground Mines Using Angle Diversity Receivers

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 367 ◽  
Author(s):  
Pablo Palacios Játiva ◽  
Milton Román Cañizares ◽  
Cesar A. Azurdia-Meza ◽  
David Zabala-Blanco ◽  
Ali Dehghan Firoozabadi ◽  
...  
Keyword(s):  
Visible Light ◽  
Mine Working ◽  
Channel Model ◽  
Underground Mining ◽  
Cumulative Distribution ◽  
Line Of Sight ◽  
Delay Spread ◽  
Noise Power ◽  
Working Face ◽  
Angle Diversity

This paper proposes two solutions based on angle diversity receivers (ADRs) to mitigate inter-cell interference (ICI) in underground mining visible light communication (VLC) systems, one of them is a novel approach. A realistic VLC system based on two underground mining scenarios, termed as mining roadway and mine working face, is developed and modeled. A channel model based on the direct component in line-of-sight (LoS) and reflections of non-line-of-sight (NLoS) links is considered, as well as thermal and shot noises. The design and mathematical models of a pyramid distribution and a new hemi-dodecahedral distribution are addressed in detail. The performances of these approaches, accompanied by signal combining schemes, are evaluated with the baseline of a single photo-diode in reception. Results show that the minimum lighting standards established in both scenarios are met. As expected, the root-mean-square delay spread decreases as the distance between the transmitters and receivers increases. Furthermore, the hemi-dodecahedron ADR in conjunction with the maximum ratio combining (MRC) scheme, presents the best performance in the evaluated VLC system, with a maximum user data rate of 250 Mbps in mining roadway and 120 Mbps in mine working face, received energy per bit/noise power of 32 dB and 23 dB, respectively, when the bit error rate corresponds to 10 − 4 , and finally, values of 120 dB in mining roadway and 118 dB in mine working face for signal-to-interference-plus-noise ratio are observed in a cumulative distribution function.

A Novel Wideband Pattern Diversity Antenna With a Low profile Based On Metasurface

2021 ◽  
pp. 1-1
Author(s):  
Jianfeng Liu ◽  
Zibin Weng ◽  
Zhi-Qiang Zhang ◽  
Yonghui Qiu ◽  
Yi-Xuan Zhang ◽  
...  
Keyword(s):  
Pattern Diversity ◽  
Low Profile ◽  
Diversity Antenna

Uniplanar polarisation diversity antenna for ultra‐wideband systems

2013 ◽  
Vol 7 (10) ◽  
pp. 851-857 ◽  
Author(s):  
Bybi P. Chacko ◽  
Gijo Augustin ◽  
Tayeb A. Denidni
Keyword(s):  
Ultra Wideband ◽  
Wideband Systems ◽  
Diversity Antenna
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