Due to the considerable fading arising from the long-distance transmission between satellites and terrestrial terminals as well as the complex geographic environments on the earth, aerial relays have been designed to facilitate the information delivery between the satellites and terrestrial terminals when reliable direct data transmissions cannot be achieved. In this paper, a cooperative satellite-aerial-terrestrial network (CSATN) system including a satellite (S), an aerial relay (R), and a terrestrial receiver (D) is considered, while decode-and-forward relay scheme is adopted. Specifically, inspired by the beam shape of the transmission signal from S, we model the operation space of R as a circular truncated cone to accurately reflect the practical large-scale transmission scenarios, the height of which is decided by the upper and lower limitations of the operation height of R. Thus, considering the randomness of R and D and employing geometric probability theory, the exact and asymptotic outage probability (OP) of S-R, S-D, and R-D links is studied, and then the end-to-end outage performance of CSATN is investigated accordingly by using approximation method. Finally, numerical results are presented to validate our proposed analysis.

中文翻译：

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空间随机终端星地天地协同网络的中断分析


由于卫星与地面终端之间的长距离传输会产生相当大的衰落，以及地球上复杂的地理环境，因此设计了空中中继，以在无法进行可靠的直接数据传输时，方便卫星与地面终端之间的信息传递。得以实现。本文考虑了一种包括卫星（S）、空中中继（R）和地面接收机（D）的合作卫星-空中-地面网络（CSATN）系统，并采用解码转发中继方案。具体来说，受S传输信号波束形状的启发，我们将R的运行空间建模为一个截锥体，以准确反映实际的大规模传输场景，其高度由因此，考虑R和D的随机性，采用几何概率理论，研究SR、SD和RD链路的精确渐近中断概率（OP），进而得出端到端的中断概率。采用近似方法对CSATN的性能进行了相应的研究。最后，给出了数值结果来验证我们提出的分析。