Performance Analysis of Free Space Optical Communication System Using Different Modulation Schemes over Weak to Strong Atmospheric Turbulence Channels

  • Suman MalikEmail author
  • Prasant Kumar Sahu
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 546)


In this paper, we have investigated the performance of an optical wireless communication system and reported the achievable BER and average channel capacity using different modulation schemes such as on-off keying (OOK), quadrature phase shift keying (QPSK), and pulse position modulation (PPM). A comparative study based on these three schemes has been studied for free space optics (FSO) system. The atmospheric channel is modeled for weak to strong atmospheric turbulences with combined effect of turbulence and pointing errors. Here, the FSO link is modeled as gamma–gamma (G–G) distribution and lognormal (LN) distribution channel models. A closed-form mathematical expression for average bit error rate (BER) and average channel capacity for various modulation schemes, viz., OOK, QPSK, and PPM, are presented, in order to analyze the performance of the FSO system. The simulated results for BER and channel capacity for different modulation techniques over gamma–gamma and lognormal distribution channel model are reported in this paper.


Atmospheric turbulence Optical wireless communication (OWC) Quadrature phase shift keying (QPSK) Pulse position modulation (PPM) Gamma–gamma distribution (G–G) Lognormal distribution (LN) 


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© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.School of Electrical SciencesIndian Institute of Technology BhubaneswarArugulIndia

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