In this paper, we investigate the downlink power adaptation for the suborbital node in suborbital-ground communication systems under extremely high reliability and ultra-low latency communications requirements, which can be formulated as a power threshold-minimization problem. Specifically, the interference from satellites is modeled as an accumulation of stochastic point processes on different orbit planes, and hybrid beamforming (HBF) is considered. On the other hand, to ensure the Quality of Service (QoS) constraints, the finite blocklength regime is adopted. Numerical results show that the transmit power required by the suborbital node decreases as the elevation angle increases at the receiving station.

翻译：本文研究了在极高可靠性和超低延迟通信需求下，亚轨道-地面通信系统中亚轨道节点的下行功率自适应问题，该问题可建模为功率阈值最小化问题。具体而言，卫星干扰被建模为不同轨道平面上随机点过程的累积，并考虑了混合波束赋形（HBF）技术。另一方面，为确保服务质量（QoS）约束，采用了有限块长机制。数值结果表明，随着接收站仰角增大，亚轨道节点所需的发射功率降低。