Link Adaptation Algorithms for Free-Space Optical Communication Systems

Hariq, Sayed Hasan; Odabasioglu, Niyazi

doi:10.1109/ants47819.2019.9118109

Cited by 1 publication

(1 citation statement)

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“…They extended the analysis based on optimal rate, optimal power and rate, and channel inversion with fixed rate adaptive transmission in [26]. The authors in [27] proposed a link adaptation algorithm using M-ary pulse position modulation (PPM) over an LN fading channel to improve the bandwidth efficiency by varying the code rate and modulation order. Enhancement of the SE of the FSO system while maintaining the target ABER was achieved using the AM technique in [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Dual-Hop DF Multi-Relay FSO System with Adaptive Modulation

Alathwary,

Altubaishi

2023

Applied Sciences

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The signal quality in high-bandwidth free space optical (FSO) systems deteriorates due to atmospheric turbulence and pointing errors. Employing techniques such as adaptive transmission and relay selection (RS) can mitigate their effects. This paper analyzes the performance of a dual-hop decode-and-forward multi-relay FSO system with an adaptive M-ary phase shift keying scheme. This analysis is based on the recently proposed Fisher–Snedecor F channel model and considers the impact of pointing errors. We propose two partial relay selection schemes based on the source-to-relay or relay-to-destination channel state information to reduce the complexity of the optimal relay selection scheme. In this investigation, we derive closed-form expressions for the outage probability, modulation level selection probability, and spectral efficiency (SE) and compare the performance of the proposed RS schemes under balanced and unbalanced link cases. We observe an improvement in the SE with an increase in the number of modulation levels and the number of relays. Moreover, it is noted that the performance of the system can be restricted by the quality of either the source-to-relay or the relay-to-destination link, even if the quality of the other link is perfect. Finally, the outcomes obtained through the derived expressions are validated using Monte Carlo simulations.

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