论文标题
通过地面站选择，下行链路光学卫星网络中的站点多样性
Site Diversity in Downlink Optical Satellite Networks Through Ground Station Selection
论文作者
论文摘要
最近的进步表明，卫星通信（SATCOM）将成为下一代地面网络的重要推动力，因为它可以提供许多优势，包括全球覆盖范围，高速连接，可靠性和即时部署。射频（RF）卫星的理想替代方法是其自由空间光学（FSO）对应物。 FSO或激光SATCOM可以减轻RF SATCOM中发生的问题，同时提供重要的优势，包括减少质量，降低消费，更好的吞吐量和降低成本。此外，激光SATCOM固有地抵抗了干扰，拦截和干扰。由于这些好处，本文重点介绍了下行链路激光SATCOM，其中最佳地面站（GS）是在众多候选人中选择的，以提供可靠的连接性和最大的场地多样性。为了量化所提出的方案的性能，我们为两种不同的实用GS部署方案得出了封闭形式的中断概率和千古能力表达式。此外，进行渐近分析以获得整体位点的多样性增益，并研究了孔径平均，以说明孔径直径对整体性能的影响。最后，概述了可以在实用激光SATCOM设计方面有用的重要设计指南。
Recent advances have shown that satellite communication (SatCom) will be an important enabler for next generation terrestrial networks as it can provide numerous advantages, including global coverage, high speed connectivity, reliability, and instant deployment. An ideal alternative for radio frequency (RF) satellites is its free-space optical (FSO) counterpart. FSO or laser SatCom can mitigate the problems occurring in RF SatCom, while providing important advantages, including reduced mass, lower consumption, better throughput, and lower costs. Furthermore, laser SatCom is inherently resistant to jamming, interception, and interference. Owing to these benefits, this paper focuses on downlink laser SatCom, where the best ground station (GS) is selected among numerous candidates to provide reliable connectivity and maximum site diversity. To quantify the performance of the proposed scheme, we derive closed-form outage probability and ergodic capacity expressions for two different practical GS deployment scenarios. Furthermore, asymptotic analysis is conducted to obtain the overall site diversity gain, and aperture averaging is studied to illustrate the impact of aperture diameter on the overall performance. Finally, important design guidelines that can be useful in the design of practical laser SatComs are outlined.
