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New Insights Into Achievable Spectral Efficiency With Adaptive Free Space Optical Transmissions

Published 17 Feb 2024 in cs.IT, eess.SP, and math.IT | (2402.11352v7)

Abstract: Terrestrial free-space optical (FSO) communication systems, while designed to operate on large unlicensed optical bandwidths, are power-constrained due to strict eye safety regulations. The channel fluctuation inherent in terrestrial FSO links also limits the received optical power. Consequently, the available signal-to-noise ratio (SNR) per Hz could become limited; this holds for future long-haul terrestrial systems based on coherent optical communications. An efficient and adaptive transmission mechanism is thus crucial at the optical source. However, a critical assessment of the impact of adaptive transmission in terrestrial FSO systems has received less attention in the literature. This work studies terrestrial FSO communication systems employing adaptive beam transmission while detection receivers operate under shot noise-limited conditions. Specifically, we propose a novel exact closed-form expression for the average spectral efficiency of these FSO systems with transmit beam power adaptation over the gamma-gamma turbulence channel with pointing error. More importantly, we provide a detailed assessment of the impact of turbulence and pointing error impairments on the performance of the aforementioned FSO systems, revealing several novel and counterintuitive insights. In particular, the extensive numerical results help elucidate the intricacies of analyzing these terrestrial FSO systems and clarify a few misconceptions alluded to in recent related literature.

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References (29)
  1. Q. Liu, C. Qiao, G. Mitchell, and S. Stanton, “Optical wireless communication networks for first- and last-mile broadband access,” IEEE/OSA J. Opt. Netw., vol. 4, no. 12, p. 807–828, 2005.
  2. D. Cornwell, “Laser communication from the Moon at 622Mb/s,” Available: http://spie.org/x107507.xml, 2014.
  3. H. Haan and M. Tausendfreund, “Free-space optical data transmission for military and civil applications: A company report on technical solutions and market investigation,” in 2013 15th International Conference on Transparent Optical Networks (ICTON).   IEEE, 2013, pp. 1–4.
  4. D. J. Heatley, D. R. Wisely, I. Neild, and P. Cochrane, “Optical wireless: The story so far,” IEEE Commun. Mag., vol. 36, no. 12, pp. 72–74, 1998.
  5. J. R. Barry and E. A. Lee, “Performance of coherent optical receivers,” Proceedings of the IEEE, vol. 78, no. 8, pp. 1369–1394, 1990.
  6. S. Bloom, E. Korevaar, J. Schuster, and H. Willebrand, “Understanding the performance of free-space optics,” Journal of Optical Networking, vol. 2, no. 6, pp. 178–200, 2003.
  7. S. Arnon, “Effects of atmospheric turbulence and building sway on optical wireless-communication systems,” Opt. Lett., vol. 28, no. 2, pp. 129–131, Jan 2003.
  8. M. 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,” Optical Engineering, vol. 40, no. 8, pp. 1554–1562, 2001.
  9. L. C. Andrews, R. L. Phillips, C. Y. Hopen, and M. Al-Habash, “Theory of optical scintillation,” JOSA A, vol. 16, no. 6, pp. 1417–1429, 1999.
  10. A. A. Farid and S. Hranilovic, “Outage capacity optimization for free-space optical links with pointing errors,” Journal of Lightwave technology, vol. 25, no. 7, pp. 1702–1710, 2007.
  11. F. Yang, J. Cheng, and T. A. Tsiftsis, “Free-space optical communication with nonzero boresight pointing errors,” IEEE Transactions on Communications, vol. 62, no. 2, pp. 713–725, 2014.
  12. M. A. Kashani, M. Uysal, and M. Kavehrad, “A novel statistical channel model for turbulence-induced fading in free-space optical systems,” Journal of Lightwave Technology, vol. 33, no. 11, pp. 2303–2312, 2015.
  13. A. Jurado-Navas, J. M. Garrido-Balsells, J. F. Paris, A. Puerta-Notario, and J. Awrejcewicz, “A unifying statistical model for atmospheric optical scintillation,” in Numerical Simulations of Physical and Engineering Processes.   Intech Rijeka, Croatia, 2011, vol. 181, no. 8, pp. 181–205.
  14. H. E. Nistazakis, E. A. Karagianni, A. D. Tsigopoulos, M. E. Fafalios, and G. S. Tombras, “Average capacity of optical wireless communication systems over atmospheric turbulence channels,” Journal of Lightwave Technology, vol. 27, no. 8, pp. 974–979, 2009.
  15. W. Gappmair, “Further results on the capacity of free-space optical channels in turbulent atmosphere,” IET communications, vol. 5, no. 9, pp. 1262–1267, 2011.
  16. A. Lapidoth, S. M. Moser, and M. A. Wigger, “On the capacity of free-space optical intensity channels,” IEEE Transactions on Information Theory, vol. 55, no. 10, pp. 4449–4461, 2009.
  17. S. M. Moser, “Capacity results of an optical intensity channel with input-dependent Gaussian noise,” IEEE Transactions on Information Theory, vol. 58, no. 1, pp. 207–223, 2012.
  18. I. S. Ansari, M.-S. Alouini, and J. Cheng, “Ergodic capacity analysis of free-space optical links with nonzero boresight pointing errors,” IEEE Trans. Wirel. Commun., vol. 14, no. 8, pp. 4248–4264, 2015.
  19. S. Bloom et al., “The physics of free-space optics,” AirFiber Inc. White Paper, pp. 1–22, 2002.
  20. A. A. Farid and S. Hranilovic, “Outage capacity optimization for free-space optical links with pointing errors,” Journal of Lightwave Technology, vol. 25, no. 7, pp. 1702–1710, 2007.
  21. J. C. Ricklin and F. M. Davidson, “Atmospheric turbulence effects on a partially coherent Gaussian beam: implications for free-space laser communication,” J. Opt. Soc. Amer. A, Opt. Image Sci., vol. 19, no. 9, pp. 1794–1802, Sept. 2002.
  22. M. Miao, X.-y. Chen, R. Yin, and J. Yuan, “New results for the pointing errors model in two asymptotic cases,” IEEE Photonics Journal, vol. 15, no. 3, pp. 1–7, 2023.
  23. K. Kikuchi, “Fundamentals of coherent optical fiber communications,” Journal of Lightwave Technology, vol. 34, no. 1, pp. 157–179, 2015.
  24. A. Chaaban, Z. Rezki, and M.-S. Alouini, “On the capacity of intensity-modulation direct-detection Gaussian optical wireless communication channels: A tutorial,” IEEE Communications Surveys & Tutorials, vol. 24, no. 1, pp. 455–491, 2021.
  25. I. S. Ansari, F. Yilmaz, and M.-S. Alouini, “Performance analysis of FSO links over unified gamma-gamma turbulence channels,” in IEEE 81st Vehicular Technology Conference (VTC Spring), 2015, pp. 1–5.
  26. I. E. Lee, Z. Ghassemlooy, W. P. Ng, M.-A. Khalighi, and S.-K. Liaw, “Effects of aperture averaging and beam width on a partially coherent Gaussian beam over free-space optical links with turbulence and pointing errors,” Applied Optics, vol. 55, no. 1, pp. 1–9, 2016.
  27. X. Tang, Z. Ghassemlooy, W. O. Popoola, and C. G. Lee, “Coherent polarization shift keying modulated free space optical links over a gamma-gamma turbulence channel,” American Journal of Engineering and Applied Sciences, vol. 4, no. 4, pp. 520–530, 2011.
  28. K. Singh, “On the capacity of low-rank dyadic fading channels in the Low-SNR regime,” Available: https://arxiv.org/abs/2308.05078, 2023.
  29. Wolfram Research, Inc., “The Wolfram Functions site,” Available: https://functions.wolfram.com/07.34.21.0002.01, [Accessed 29-May-2023].

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