A novel multi‐ quality of service system design: Integration of hybrid free space optical/ RF , cognitive hybrid and free space optical links

2021 ◽  
Author(s):  
Soyinka Nath ◽  
Shree Prakash Singh ◽  
Sujata Sengar
Keyword(s):  
Quality Of Service ◽  
System Design ◽  
Free Space ◽  
Service System ◽  
Free Space Optical ◽  
Optical Links ◽  
Service System Design ◽  
Design Integration

Cloud attenuations for free-space optical links

2009 ◽  
Author(s):  
M. S. Awan ◽  
Marzuki ◽  
E. Leitgeb ◽  
B. Hillbrand ◽  
F. Nadeem ◽  
...  
Keyword(s):  
Free Space ◽  
Free Space Optical ◽  
Optical Links

scholarly journals Characteristics of Changes of Transportation Performance for Pairs of Critical Edges

2018 ◽  
Vol 20 (3) ◽  
pp. 84-87
Author(s):  
Peter Czimmermann ◽  
Michal Kohani
Keyword(s):  
System Design ◽  
Public Service ◽  
System Performance ◽  
Service System ◽  
Transportation Network ◽  
Service System Design ◽  
The Creation ◽  
Random Failures

When the robustness of a public service system design is tested, we can often use scenarios where possible random failures can occur and they can influence the time the service is accessible which is provided for system users. The construction of a suitable scenario is based on the choice of links of the transportation network which influence the system performance in a substantial way. In such scenarios one or multiple arcs can be affected by this failure. In our contribution we present characteristics of pairs of critical arcs that can be used to develop an algorithm for the creation of critical scenarios.

scholarly journals Energy Optimization of a Laser-Powered Hovering-UAV Relay in Optical Wireless Backhaul

2021 ◽  
Author(s):  
Muhammad Salman Bashir ◽  
Mohamed-Slim Alouini
Keyword(s):  
Quality Of Service ◽  
Communication Systems ◽  
Low Cost ◽  
Base Stations ◽  
Achievable Rate ◽  
Optical Wireless ◽  
Free Space Optical ◽  
Decode And Forward ◽  
Wireless Backhaul

<div>Due to their flexibility and low cost deployment, unmanned aerial vehicles (UAV) will most likely act as base stations and backhaul relays in the next generation of wireless communication systems. However, these UAVs---in the untethered mode---can only operate for a finite time due to limited energy they carry in their batteries. In free-space optical communications, one solution is to transport both the data and the energy from the source to the UAV through the laser beam---a concept known as <i>simultaneous lightwave information and power transfer</i> (SLIPT). In this study, we have analyzed the SLIPT scheme for laser-powered decode-and-forward UAV relays in an optical wireless backhaul. The major goal of this study is to optimally allocate the received beam energy between the decoding circuit, the transmitting circuit and the rotor block of the relay in order to maximize a quality-of-service metric such as maximum achievable rate, outage or error probabilities. As expected, we note that the optimal power allocation depends heavily on the source-relay and relay-destination channel conditions. In the final part of this study, we have maximized the operational time of the UAV relay given that the maximum achievable rate stays above a certain threshold in order to meet a minimum quality-of-service requirement.</div>

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