To date, free-space optical (FSO) networks play an important role in current network construction to support large-capacity transmission, where randomly distributed FSO terminals desire to exchange a tremendous amount of information over atmospheric turbulence channels. However, in the presence of atmospheric turbulence and misalignment fading channels, FSO network topology can be dynamic and disconnected. To mitigate the impact of dynamic network environments, appropriate higher-layer protocols should be designed. We explore a practical terrestrial mobile ad-hoc FSO network based on the bundle protocol of disruption-tolerant network, and the theoretical cross-layer system model between physical layer and network layer is derived. To design the topology, at the bundle layer, the distributed routing scheme centrality and probability (CAP) is proposed, where contact probability, sociocentric measure, and message replication strategy are considered simultaneously, and the joint forwarding decision rule is given. Simulation results on the opportunistic networking environment simulator are presented, which show that CAP can be better compared with the conventional end-to-end protocol-based routing scheme.
KEYWORDS: Polarization, Turbulence, Atmospheric propagation, Telecommunications, Atmospheric turbulence, Anisotropy, Global system for mobile communications, Wireless communications, Radio propagation, Beam propagation method
Based on the extended Huygens-Fresnel principle and the unified theory of polarization and coherence, the explicit expression of cross-spectral density matrix for partially coherent beams in far field is derived. Also, we investigate the polarization changes of beams travelling through anisotropic turbulence along the horizontal link when the source is isotropic and anisotropic in correlation. Simulation results show strong relevance between the polarization states of beams and the source correlation. The conditions for partially coherent beams to be less affected by turbulence are given.
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