Abstract
In this work, spatial diversity techniques have been proposed for free-space optical (FSO) communication systems to combat the deteriorating effects, such as atmospheric turbulence effects and pointing errors, and the performance of FSO communication systems with Alamouti encoding scheme over Málaga <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$(\mathcal {M})$</tex-math></inline-formula> turbulence channel is investigated. We first derive the probability distribution function (PDF) of end-to-end channel gain under atmospheric turbulence and pointing error circumstances. Then, by capitalizing on this PDF, closed-form expressions of the average bit error rate (BER) and the outage probability (OP) for the proposed system are obtained. Additionally, to provide more insights, the asymptotic expressions for the average BER and the OP are also derived. In the analysis, intensity modulation/direct detection and heterodyne detection techniques are considered so that the obtained results can cover both cases. Furthermore, analytic results are successfully validated through Monte Carlo simulations. Our results highlight the gains in performance that can be achieved when Alamouti encoding scheme is employed in FSO communication systems.
Highlights
F REE space optical (FSO) communication system is a wireless technology that has gained a considerable attention in the recent past due to its promise to provide the ultra-high data rate required by the fifth-generation (5G) and beyond 5G wireless networks [1]
In this study, motivated from the references given above and to fill in the gap in the current literature, we investigate the average bit error rate (BER) and the outage probability (OP) performance metrics for FSO communication links employing Alamouti encoding scheme over the generalized M turbulence channel with pointing errors effect
Alamouti encoding scheme is proposed to be employed in FSO communication systems to combat the atmospheric turbulence and pointing errors effects, and increase the reliability of the entire system
Summary
F REE space optical (FSO) communication system is a wireless technology that has gained a considerable attention in the recent past due to its promise to provide the ultra-high data rate required by the fifth-generation (5G) and beyond 5G wireless networks [1]. In this study, motivated from the references given above and to fill in the gap in the current literature, we investigate the average BER and the OP performance metrics for FSO communication links employing Alamouti encoding scheme over the generalized M turbulence channel with pointing errors effect. In the analysis, both IM/DD and HD techniques are considered and the closed-form expressions of the average BER and the OP of the proposed system are obtained.
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