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Utilisation des techniques avancées d’Emission / Réception multi-antennes pour une transmission optique large bande

Abstract : Free space optical systems are potential candidates of large band spatial transmission solutions. In this thesis, FSO network architecture in the case of geo- stationary satellite to earth communication link is investigated and the influence of zenith angle on the quality of the link has been evaluated. Because of the variation of scintillation due to the complexity of the atmosphere, the optical space to earth communication link channel model has been developped. In order to overcome the main limitations of the prop- agation, optical relays with low earth orbit satellites and spatial diversity on earth could improve the link performance. To improve the link performance, an aggregated simulation model turbulence has been built based on parameters ”p” and ”1-p” introduced in the combined model a↵ecting the considered channels. The parameter ” p ” corresponds to the ratio of the distance from the earth to the relay over the total distance of 36 000Km. In the case of 1000 Km for a relay in the exosphere, p = 1/36. Simulation results show that the proposed network system architecture has outperformed the direct link performance
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Octave Ringar. Utilisation des techniques avancées d’Emission / Réception multi-antennes pour une transmission optique large bande. Optique / photonique. Université de Limoges; Université Cheikh Anta Diop (Dakar), 2015. Français. ⟨NNT : 2015LIMO0100⟩. ⟨tel-01271419⟩

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