Commenced in January 2007
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Paper Count: 30011
Effect of Atmospheric Turbulence on Hybrid FSO/RF Link Availability under Qatar Harsh Climate

Authors: Abir Touati, Syed Jawad Hussain, Farid Touati, Ammar Bouallegue

Abstract:

Although there has been a growing interest in the hybrid free-space optical link and radio frequency FSO/RF communication system, the current literature is limited to results obtained in moderate or cold environment. In this paper, using a soft switching approach, we investigate the effect of weather inhomogeneities on the strength of turbulence hence the channel refractive index under Qatar harsh environment and their influence on the hybrid FSO/RF availability. In this approach, either FSO/RF or simultaneous or none of them can be active. Based on soft switching approach and a finite state Markov Chain (FSMC) process, we model the channel fading for the two links and derive a mathematical expression for the outage probability of the hybrid system. Then, we evaluate the behavior of the hybrid FSO/RF under hazy and harsh weather. Results show that the FSO/RF soft switching renders the system outage probability less than that of each link individually. A soft switching algorithm is being implemented on FPGAs using Raptor code interfaced to the two terminals of a 1Gbps/100 Mbps FSO/RF hybrid system, the first being implemented in the region. Experimental results are compared to the above simulation results.

Keywords: Atmospheric turbulence, haze, soft switching, Raptor codes, refractive index.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1108877

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References:


[1] H. G. Yong and al., “Free space optical communication using visible light”, Journal of Zhejiang University Science.
[2] M. A. Ali, '”Free space lasers propagation at different weather conditions'”, Al Mustansiriyah, J. Sci, Vol. 23, No 2, 2012.
[3] M. Rouissat and al., “Free space optical channel characterization and modeling with focus on Algeria weather conditions”, Journal of Computer Network and Information Security, 2012.
[4] I. E. Lee and al., “Practical implementation and performance study of a hard switched hybrid FSO/RF Link under controlled fog environment”, 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP), 2014 .
[5] H. Tapse and al., “'Hybrid optical/RF channel performance analysis for Turbo codes”', IEEE transactions on communications, Vol. 59, No. 5, 2011.
[6] W. Zhang, S. Hranilovic, “Soft switching hybrid FSO/RF links using short-length Raptor codes: Design and implementation”, IEEE Journal on selected areas in communications, Vol. 27, No. 9, 2009.
[7] M. Al Naboulsi and al, “Propagation of optical and infrared waves in the atmosphere”, pp. 481-495, 2005.
[8] A. Alkholidi and K. Altowij, “effect of clear Atmospheric turbulence on quality of free space optical communications in western Asia”, ISBN: 978-953-51-0170-3, 2012.
[9] A. Majumdar, “Free-space laser communication performance in the atmospheric channel”, Journal of optical Communication, 2005.
[10] A. N. Zaki and al., “Dramatic atmospheric turbulence effects on submarine laser communication Systems and free space optics”, International Journal of Advanced Research in Computer Engineering & Technology (IJARCET), Vol. 3, March 2011.
[11] H. Mouradi and al., “Reconfiguration modeling of reconfigurable hybrid FSO/RF links”, IEEE, ICC, 2010.
[12] H. Kazemi, M. Uysal and F. Touati, “Outage analysis of hybrid FSO/RF systems based on finite state Markov chain modeling”, 3rd international workshop in optical wireless Communications, 2014.
[13] A. Shokrollahi, “Raptor codes”, June 19, 2003.
[14] “http://www.timeanddate.com/weather/qatar/doha/historic”, (Online).
[15] https://digilentinc.com/Data/Products/NETFPGA-1G-CML, (Online), July 2014.