Optical spatial diversity for FSO communications

Research output: Chapter in Book/Report/Conference proceedingChapter


The performance of the terrestrial free-space optical (FSO) communication is adversely affected by atmospheric conditions such as fog, rain, dust particles, and smoke. Even in clear atmospheric conditions, the FSO link experiences severe fading due to the turbulence effect. Turbulence is induced by random variations in refractive index due to temperature and pressure fluctuations along the FSO beam propagation. Turbulence can introduce deep fading (20 to 30 dB); as a result, the outage probability increases significantly. In order to mitigate the channel fading, the receiver or transmitter diversities or a combined transmitter and receiver diversity (known as multiple-input multiple-output (MIMO) techniques) are often considered along with other techniques such as modulation, temporal and wavelength diversities. In this chapter, the FSO link performance in the presence of the turbulence fading using transmitter and receiver diversity is discussed.

Original languageEnglish
Title of host publicationPrinciples and Applications of Free Space Optical Communications
EditorsArun K. Majumdar, Zabih Ghassemlooy, A. Arockia Bazil Raj
PublisherInstitution of Engineering and Technology
Number of pages20
ISBN (Electronic)9781785614163
Publication statusPublished - Jun 2019


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