arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.11786eess.SP
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地对高海拔平台(HAP)自由空间光通信网络的解析信道模型与链路设计优化

Analytical Channel Model and Link Design Optimization for Ground-to-HAP Free-Space Optical Communication Networks

Hossein Safi, Akbar Dargahi, Julian Cheng, Majid Safari

AI总结:

针对地对HAP FSO链路受指向误差、AOA波动等限制的问题,推导了含多因素影响的闭式信道模型与中断概率表达式,优化发射光束和接收视场以最小化中断概率,结果可直接用于链路设计无需耗时仿真。

摘要:

将高海拔平台(high altitude platforms, HAPs)与自由空间光(free-space optical, FSO)通信相结合,是为下一代无线网络构建高数据速率空中链路的一种极具前景的方案。然而,悬停HAP的姿态偏移会导致光束指向误差、到达角(angle-of-arrival, AOA)波动等实际限制,使得基于HAP的FSO链路部署面临挑战。针对地对HAP FSO链路,本文推导了易于处理的闭式统计信道模型,以简化此类系统的优化设计。所提出的模型综合考虑了大气湍流机制(即对数正态分布和伽马-伽马分布)、指向误差引发的几何损耗、光束漂移导致的指向抖动方差、探测器孔径尺寸、光束宽度以及接收光束的AOA波动等因素的共同影响。通过蒙特卡洛(Monte-Carlo)仿真验证了这些解析表达式的正确性。此外,本文还推导了所研究链路在不同湍流机制下的中断概率闭式表达式。本文开展了详细分析,以优化发射激光束和接收机视场,从而在不同信道条件下最小化中断概率。所得解析结果可用于确定最优参数值并设计地对HAP FSO链路,无需借助耗时的仿真。

英文摘要:

Integrating high altitude platforms (HAPs) and free-space optical (FSO) communications is a promising solution to establish high data rate aerial links for the next-generation wireless networks. However, practical limitations such as pointing errors and angle-of-arrival (AOA) fluctuations of the optical beam due to the orientation deviations of hovering HAPs make it challenging to implement HAP-based FSO links. For a ground-to-HAP FSO link, tractable, closed-form statistical channel models are derived in this paper to simplify the optimal design of such systems. The proposed models include the combined effects of atmospheric turbulence regimes (i.e., log-normal and gamma-gamma), pointing error induced geometrical loss, pointing jitter variance caused by beam wander, detector aperture size, beam-width, and AOA fluctuations of the received optical beam. The analytical expressions are corroborated by performing Monte-Carlo simulations. Furthermore, closed-form expressions for the outage probability of the considered link under different turbulence regimes are derived. Detailed analysis is carried out to optimize the transmitted laser beam and the field-of-view of the receiver for minimizing outage probability under different channel conditions. The obtained analytical results can be applied to finding the optimal parameter values and designing ground-to-HAP FSO links without resorting to time-consuming simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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