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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editors: K. Bergman and O. Gerstel
  • Vol. 4, Iss. 10 — Oct. 1, 2012
  • pp: 836–846

Channel Measurement and Markov Modeling of an Urban Free-Space Optical Link

Ayman Mostafa and Steve Hranilovic  »View Author Affiliations

Journal of Optical Communications and Networking, Vol. 4, Issue 10, pp. 836-846 (2012)

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Free-space optical (FSO) communication links provide high data rates; however, their reliability is heavily dependent on weather conditions. This paper presents our experimental urban 1.87 km FSO link based on a customized commercial system and develops a library of channel measurements in clear and light rain weather conditions. A channel model for the link is proposed and experimentally quantified. Channel measurements are obtained by modulating a 60 mW laser source. At the receiver, a 2 GSa/s data converter is used and 16 fast-Fourier transform cores are implemented in the hardware to improve noise immunity. The resulting signal-to-noise ratio of the channel samples is around 40 dB under clear weather conditions. Fittings with log-normal, gamma–gamma, and Erlang distributions are presented, and the scintillation index and coherence time are measured. A computationally efficient finite-state Markov chain is derived for the channel to model both the distribution and the autocorrelation of the fading and is verified by the measurements. The Markov models and channel measurements in a variety of atmospheric conditions are available for download to permit easy verification of communication algorithms on this urban FSO channel.

© 2012 OSA

OCIS Codes
(350.5500) Other areas of optics : Propagation
(060.2605) Fiber optics and optical communications : Free-space optical communication

ToC Category:
Research Papers

Original Manuscript: February 1, 2012
Revised Manuscript: June 27, 2012
Manuscript Accepted: September 5, 2012
Published: September 28, 2012

Ayman Mostafa and Steve Hranilovic, "Channel Measurement and Markov Modeling of an Urban Free-Space Optical Link," J. Opt. Commun. Netw. 4, 836-846 (2012)

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  1. L. C. Andrews and R. L. Phillips, Laser Beam Propagation through Random Media, 2nd ed.SPIE, Bellingham, Washington, 2005.
  2. M. E. Gracheva and A. S. Gurvich, “Strong fluctuations in the intensity of light propagated through the atmosphere close to the Earth,” Radiofiz., vol. 8, no. 4, pp. 717–724, 1965.
  3. F. S. Vetelino, C. Young, L. Andrews, and J. Recolons, “Aperture averaging effects on the probability density of irradiance fluctuations in moderate-to-strong turbulence and spherical waves in the atmosphere,” J. Appl. Opt., vol. 46, no. 11, pp. 2099–2108, Apr.2007. [CrossRef]
  4. A. Khatoon, W. G. Cowley, and N. Letzepis, “Channel measurement and estimation for free space optical communications,” in AusCTW, Jan.–Feb. 2011.
  5. F. S. Marzano, S. Mori, F. Frezza, P. Nocito, G. M. T. Beleffi, G. Incerti, E. Restuccia, and F. Consalvi, “Free-space optical high-speed link in the urban area of southern Rome: preliminary experimental set up and channel modelling,” in Proc. of the 5th European Conf. on Antennas and Propagation (EUCAP), Apr. 2011, pp. 2737–2741.
  6. K.-H. Kim, T. Higashino, K. Tsukamoto, and S. Komaki, “Optical fading analysis considering spectrum of optical scintillation in terrestrial free-space optical channel,” in Int. Conf. on Space Optical Systems and Applications, Santa Monica, CA, May 2011, pp. 58–66.
  7. M. Gebhart, E. Leitgeb, and J. Bregenzer, “Atmospheric effects on optical wireless links,” in Proc. of the 7th Int. Conf. on Telecommunications (ConTEL), Zagreb, Croatia, June 2003, vol. 2, pp. 395–401.
  8. Free-Space Optical Communication Algorithms Laboratory (FOCAL), McMaster University [Online]. Available: http://focal.mcmaster.ca/.
  9. fSONA Networks, Inc. (2011) [Online]. Available: http://www.fsona.com/.
  10. TEK Microsystems, Inc. [Online]. Available: http://www.tekmicro.com/.
  11. DigitalGlobe, Inc. (2012) [Online]. Available: http://www.digitalglobe.com/.
  12. Xilinx, Inc. (2011) [Online]. Available: http://www.xilinx.com/support/documentation/virtex-5.htm.
  13. S. M. Kay, Modern Spectral Estimation: Theory And Application. Prentice Hall, Englewood Cliffs, NJ, 1988.
  14. The Weather Network [Online]. Available: http://www.theweathernetwork.com/weather/caon0289.
  15. H. Willebrand and B. S. Ghuman, Free Space Optics: Enabling Optical Connectivity in Today’s Networks. Sams Publishing, 2002.
  16. I. Kim, J. Koontz, H. Hakakha, P. Adhikari, R. Stieger, C. Moursund, M. Barclay, A. Stanford, R. Ruigrok, J. Schuster, and E. Korevaar, “Measurement of scintillation and link margin for the terralink laser communication system,” Proc. SPIE, vol. 3232, pp. 100–118, Jan.1998. [CrossRef]
  17. F. S. Vetelino, B. Clare, K. Corbett, C. Young, K. Grant, and L. Andrews, “Characterizing the propagation path in moderate to strong optical turbulence,” J. Appl. Opt., vol. 45, no. 15, pp. 3534–3543, May2006. [CrossRef]
  18. “Xilinx LogiCORE IP Fast Fourier Transform v7.1,” Mar.2011 [Online]. Available: http://www.xilinx.com/support/documentation/ip_documentation/xfft_ds260.pdf.
  19. G. R. Osche, Optical Detection Theory for Laser Applications. Wiley-Interscience, 2002.
  20. M. A. Al-Habash, L. C. Andrews, and R. L. Phillips, “Mathematical model for the irradiance probability density function of a laser beam propagating through turbulent media,” Opt. Eng., vol. 40, pp. 1554–1562, Aug.2001. [CrossRef]
  21. M. L. B. Riediger, R. Schober, and L. Lampe, “Multiple-symbol detection for photon-counting MIMO free-space optical communications,” IEEE Trans. Wireless Commun., vol. 7, no. 12, pp. 5369–5379, Dec.2008. [CrossRef]
  22. NIST/SEMATECH e-handbook of Statistical Methods [Online]. Available: http://www.itl.nist.gov/div898/handbook/.
  23. H. S. Wang and N. Moayeri, “Finite-state Markov channel - a useful model for radio communication channels,” IEEE Trans. Veh. Technol., vol. 44, no. 1, pp. 163–171, Feb.1995. [CrossRef]
  24. Q. Zhang and S. Kassam, “Finite-state Markov model for Rayleigh fading channels,” IEEE Trans. Commun., vol. 47, no. 11, pp. 1688–1692, Nov.1999. [CrossRef]
  25. V. Bhaskar, “Finite-state Markov model for lognormal, chi–square (central), chi–square (non-central), and K-distributions,” Int. J. Wireless Inf. Networks, vol. 14, no. 4, pp. 237–250, Oct.2007. [CrossRef]
  26. X. Zhu and J. M. Kahn, “Markov chain model in maximum-likelihood sequence detection for free-space optical communication through atmospheric turbulence channels,” IEEE Trans. Commun., vol. 51, no. 3, pp. 509–516, Mar.2003. [CrossRef]

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