| Ultraviolet (UV) communication has become a hot topic in the free-space optical communication research area due to its security and none line of sight communication with high sensitivity. Recently, great progress has been made on point to point UV communication test systems at home and abroad. But the theoretical study on UV communication channel is quite limited. This thesis establishes a multiple scattering model of UV communication channel based on Monte Carlo method, and presents numerical analyses on its channel capacity, delay and so on.The first part of this thesis introduces the advantages of UV communication, investigates present research developments on it, and addresses the main research subject of the thesis, i.e. the characteristics of the UV atmospherical channel. The second part studies the propagation of UV signal through the atmosphere, and discusses the physical effects that need to be modeled. In the third part, the principle of UV non-line-communication is introduced, as well as the principle and present achievements of the single-scattering model. Then, the multiple-scattering model of UV channel based on Monte Carlo method is studied and implemented in C language. Numerical results on the UV channel characteristics are provided, such as pulse widening, the relationship between received energy and channel capacity, off-axis angle, etc.The second research subject of this thesis is the test standard of OTN network equipments in power communication networks. This part investigates the importance of OTN technology in the evolution of core networks, and analyzes its key protocol ITU-T G.709. Then, the test standard is proposed, which takes into account the compliance with G.709, quality of optical signal, jitter and drift, networking capabilities, etc.Finally, a summary on the work of this thesis is provided, and a method to optimize the UV channel model is presented for future work. |
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