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Performance Analysis of Coherent Modulation Schemes in Free-Space Optical Communication Links

M. Shunmuga Lakshmi, N. Suriya

Abstract


Free space optical communication is widely used for long range of distances. Laser beam signals are transmitted through air in coherent free space optical communication. Due to atmospheric turbulence, an optical signal gets affected. This turbulence causes fluctuations in the intensity of the received optical signal. The performance of free space optical communication links is severely degraded due to turbulence. Spatial diversity and coding schemes are used to mitigate the effect of turbulence. The channel parameter is within the range (1,2) and scintillation index is within the range (2,3). The bit error rate of BPSK and 4-QAM is analyzed using closed form moment generating functions under K-distributed turbulence. 

Keywords


Atmospheric Turbulence, Diversity, Free Space Optical Communication, Coherent Detection, Bit Error Rate

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References


E. Jakeman and P.N. Pusey, “Significance of K distributions in scattering experiments,” Phys. Rev. Lett. , vol. 40, pp. 546- 550, Feb. 1978

G. Parry, “Meaurement of atmospheric turbulence induced intensity fluctuations in a laser beam,” Opt. Acta, vol. 28, pp. 715-728, May 1981.

K.Kiasaleh, “Performance of coherent DPSK free space optical communication systems in K-distributed turbulence,” IEEE Trans. Commun., vol.54, pp. 604-607, Apr.2006.

S. Karp, R. Gagliardi, S.E. Moran, and L. B. Stotts, Optical Channels. Plenum, 1988.

M. Z. Win, C.-C. Chen, and R. A. Scholtz, “Optical Phase-Locked Loop (OPLL) for an amplitude modulated communications link using solidstate lasers," IEEE J. Sel. Areas Commun., vol. 13, pp. 569-576, Mar. 1995.

X. Zhu and J. M. Kahn, “Free-space optical communication through atmospheric turbulence channels," IEEE Trans. Commun., vol. 50, pp.1293-1300, Aug. 2002.

X. Zhu and J. M. Kahn, “Performance bounds for coded free-space optical communications through atmospheric turbulence channels," IEEE Trans. Commun., vol. 51, pp. 1233-1239, Aug. 2003.

S. M. Navidpour, M. Uysal, and M. Kavehrad, “BER performance of free-space optical transmission with spatial diversity," IEEE Trans.Wireless Commun., vol. 6, pp. 2813-2819, Aug. 2007.

M. Uysal, S. M. Navidpour, and J. Li, “Error rate performance of coded free-space optical links over strong turbulence channels," IEEE Commun. Lett, vol. 8, pp. 635-637, Oct. 2004.

A. Belmonte and J. M. Kahn, “Performance of synchronous optical receivers using atmospheric compensation techniques," Optics Express, vol. 16, pp. 14151-14162, Sep. 2008.

G. P. Agrawal, Fiber-Optical Communication Systems, 3rd edition.Wiley, 2002.

N. Letzepis and A. Guillen i Fabregas, “Outage analysis in MIMO free-space optical channels with pulse-position modulation," technical report, Department of Engineering, University of Cambridge,CUED/FINFENG/TR 597, Feb. 2008.

M. Alouini and A. J. Goldsmith, “A unified approach for calculating error rates of linearly modulated signals over generalized fading channels, "IEEE Trans. Commun., vol. 47, pp. 1324-1334, Sep. 1999.

Mingbo Niu1, Julian Cheng and Jonathan F. Holzman,” Exact error rate analysis of equal gain and selection diversity for coherent free-space optical systems on strong turbulence channels,” 2010 Optical Society of America.

Nestor D. Chatzidiamantis¤, Harilaos G. Sandalidisy, George K. Karagiannidis¤ and Michail Matthaiou, “A Simple Statistical Model for Turbulence-Induced Fading in Free-Space Optical Systems,” Institute for Circuit Theory and Signal Processing, Technische Universit¨at M¨unchen (TUM), Munich, Germany


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