scholarly journals Effect of Environmental Parameters on the Performance of Optical Wireless Communications

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Hosam Abd Elrazek Mohamed Ali ◽  
El-Sayed Soliman A. Said ◽  
Mohamed Ebrahim Yousef
Keyword(s):  
Wireless Communications ◽  
Free Space ◽  
Communication Systems ◽  
High Speed ◽  
System Analysis ◽  
Environmental Parameters ◽  
Weather Conditions ◽  
Optical Wireless ◽  
Free Space Optical ◽  
Optical Wireless Communications

Free space optical communication systems are the future of the communication systems which can meet the needs of the end users who are demanding high bandwidths to support high-speed communication. These merits are due to its numerous advantages as well as their better performance. This paper studies the effect of environmental parameters like rain, fog, haze, snow, and dust on the performance of optical wireless communications using Opti-system program. This work considers the effect of visibility as well as operating wavelengths on atmospheric attenuation in different weather conditions for free space optical link. For different weather conditions the max distance between transmitter and receiver can also be estimated. The system analysis depicted the better performance of the Multi-Input/Multi-Output (MIMO) configurations compared to Single Input/Single Output (SISO) at different weather conditions.

Optical Wireless Communications in Vehicular Systems

2013 ◽  
pp. 209-222
Author(s):  
Matthew Higgins ◽  
Zeina Rihawi ◽  
Zaiton Abdul Mutalip ◽  
Roger Green ◽  
Mark S. Leeson
Keyword(s):  
Wireless Communications ◽  
Free Space ◽  
Optical Wireless ◽  
Engine Compartment ◽  
Free Space Optical ◽  
Optical Wireless Communications ◽  
Wireless Links ◽  
Optical Propagation ◽  
Basic Understanding ◽  
Network Topologies

This chapter reviews some of the network topologies and technologies within current vehicular systems. This is then followed by a proposal from the authors with initial viability results, into the possibility of implementing optical wireless links to either replace or complement these existing ideas. The initial motivation for this work (Green, 2010) is that there exist multiple pathways within a vehicle such as the engine compartment, within the frame of the chassis, or the internal cockpit that all lend themselves nicely to free space optical propagation. The first specialised study on the viability of optical wireless communications within the vehicles cabin was then published in (Higgins et al, 2012) which provided a further impetus to the concept. It is hoped that through the original results presented here, the reader can gain a basic understanding of the concepts compared to the current technologies, and are then able instigate their own research ideas.

Free Space Optical Communication System under Different Weather Conditions

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammad Yawar Wani ◽  
Hitesh Pathak ◽  
Karamjit Kaur ◽  
Anil Kumar
Keyword(s):  
Attenuation Coefficient ◽  
Optical Communication ◽  
Free Space ◽  
Communication Systems ◽  
High Speed ◽  
Free Space Optical Communication ◽  
Free Space Optical ◽  
Wide Range ◽  
Space Optical Communication ◽  
The Impact

AbstractFree space optical communication systems (FSO’s) have surfaced as admired means of communication in the past few years. High speed of operation, low bandwidth requirements and system reliability are the major factors responsible for their wide range of applications. These communication systems use air as a medium of transmission. Since there is no component like fiber or cable, but air is only medium, the variations in atmospheric conditions play a vital role in performance of these networks. The reason behind is that the conditions like presence of humidity, haze, snowfall, rain, dust or smoke changes the attenuation coefficient of medium. The raised attenuation levels results in increased losses and need to be carefully monitored. The present work analyzes the influence of rain on the performance of FSO network in terms of quality of transmission. The paper discusses the impact of rainfall on attenuation coefficient of air. Then impact of this attenuation on network transmission is presented in terms of BER and Q-factor. In order to demonstrate the impact, BER and Q-value is calculated for 10 Gbps FSO link for clear weather and rainfall conditions.

scholarly journals Underwater Optical Wireless Communications with Chromatic Dispersion and Time Jitter

Computation ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 35 ◽  
Author(s):  
Roumelas ◽  
Nistazakis ◽  
Stassinakis ◽  
Volos ◽  
Tsigopoulos
Keyword(s):  
Wireless Communications ◽  
Communication Systems ◽  
Chromatic Dispersion ◽  
Mathematical Expression ◽  
Optical Wireless ◽  
Optical Wireless Communications ◽  
Time Jitter ◽  
High Data ◽  
Data Rates ◽  
Very High

The obsolete communication systems used in the underwater environment necessitates the development and use of modern telecommunications technologies. One such technology is the optical wireless communications, which can provide very high data rates, almost infinite bandwidth and very high transmission speed for real time fast and secure underwater links. However, the composition and the optical density of seawater hinder the communication between transmitter and receiver, while many significant effects strongly mitigate the underwater optical wireless communication (UOWC) systems’ performance. In this work, the influences of chromatic dispersion and time jitter are investigated. Chromatic dispersion causes the temporal broadening or narrowing of the pulse, while time jitter complicates the detection process at the receiver. Thus, the broadening of the optical pulse due to chromatic dispersion is studied and the influence of the initial chirp is examined. Moreover, the effect of the time jitter is also taken into consideration and for the first time, to the best of our knowledge, a mathematical expression for the probability of fade is extracted, taking into account the influence of both of the above-mentioned effects for a UOWC system. Finally, the appropriate numerical results are presented.

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