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首页> 外文会议>International Conference on Advances in Computing and Communication Engineering >Variation of Altitude On The Variance Of Angle Of Arrival Fluctuations For Optical Beam Propagation In Free Space Optical Communications
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Variation of Altitude On The Variance Of Angle Of Arrival Fluctuations For Optical Beam Propagation In Free Space Optical Communications

机译：自由空间光学通信中光束传播的到达角度差异的差异

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Media convergence, endlessly increasing request for adequate bandwidth, fast growing number of mobile subscribers and spectrum congestion have forced the recent advancement in the research of Free Space Optical (FSO) Communication system. This technology has the potential to provide adequate bandwidth and cater for the fast growing number of voice, data and multimedia users. However, the system performance is being impaired by signal fluctuation, scattering and absorption. In addition to these impairments, the distortion of optical beam also contributes to total signal degradations. As it is important to apply several mitigation techniques to combat these challenges, it is also important to do a thorough study on the level of turbulence contributed by the refractive index structure and the height. This paper presents a model study on the atmospheric turbulence effects due to refractive index and height, the effects on the Angle of Arrival (AOA) and its influence on the FSO communication link. In this work, we used the Hufnagel-Valley Boundary (HVB) model and Gamma-Gamma distribution model with a suitable modulation technique to investigate the effects of atmospheric turbulence on the optical beam propagating through free space. Thus, the amplitude and phase fluctuations were investigated and this study demonstrates that variations in height and the refractive index of the propagating medium are major causes of turbulence. The heights of FSO link were varied and the effects of turbulence were simultaneously observed on the FSO link in order to estimate the status of the link performance.
机译：媒体融合，无休止地增加了足够的带宽的要求，移动用户快速越来越多的移动用户和频谱拥堵已经强迫了最近的自由空间光学（FSO）通信系统的进步。该技术有可能提供足够的带宽和迎合快速越来越多的语音，数据和多媒体用户。然而，系统性能因信号波动，散射和吸收而受到损害。除了这些损伤之外，光束的变形还有助于总信号降级。由于应用几种缓解技术来对抗这些挑战，因此对折射率结构和高度贡献的湍流水平进行彻底研究也很重要。本文提出了对折射率和高度引起的大气湍流效应的模型研究，对到达角度（AOA）的影响及其对FSO通信链路的影响。在这项工作中，我们使用HUFNAGEL-VALELY边界（HVB）模型和GAMMA-GAMMA分布模型，具有合适的调制技术，以研究大气湍流对通过自由空间传播的光束的影响。因此，研究了幅度和相位波动，本研究表明，繁殖介质的高度和折射率的变化是湍流的主要原因。变化FSO链路的高度，并在FSO链路上同时观察到湍流的影响，以估计链路性能的状态。

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