This paper investigates downlink power adaptation for the suborbital node in suborbital-ground communication systems, which are subject to extremely high reliability and ultra-low latency communications requirements. The problem is formulated as a power threshold-minimization problem, where interference from satellites is modeled as an accumulation of stochastic point processes on different orbit planes, and hybrid beamforming (HBF) is considered. To ensure Quality of Service (QoS) constraints, the finite blocklength regime is adopted. Numerical results show that the required transmit power of the suborbital node decreases as the elevation angle at the receiving station increases.

翻译：本文研究了亚轨道-地面通信系统中亚轨道节点的下行链路功率自适应问题，该系统需满足极高可靠性和超低时延的通信需求。该问题被建模为功率阈值最小化问题，其中来自卫星的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）。为保障服务质量（QoS）约束，本文采用了有限块长度机制。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将降低。