AI 中文总结
研究窄多波束LEO卫星随机接入网络中干扰的时空相关性，推导相关系数闭式表达式，发现SIR有空间聚类，证明适当随机接入方案可减轻聚类并保持吞吐量，还提出干扰功率和SIR的分布模型。
AI 中文摘要
干扰是新兴密集低地球轨道（LEO）网络中的一个限制因素。在LEO网络中，干扰在空间和时间上具有相关性。在窄波束LEO基站，空间干扰变化显著，多径衰落引入时间变化。在多波束场景中开展新型随机几何分析时，我们探索了LEO上行链路中的时空干扰相关性，推导了时空干扰相关系数的闭式表达式。作为分析应用，表明信号与干扰比（SIR）存在显著空间聚类，波束近高斯时尤其普遍。我们证明适当设计的免授权随机接入方案，特别是时隙ALOHA，可减轻波束上的空间SIR聚类同时保持平均吞吐量。此外，我们提出了干扰功率分布的新型伽马分布模型和SIR的洛马克斯分布模型。
英文摘要
Interference is a limiting factor in the emerging dense low Earth orbit (LEO) networks. In the LEO network, the interference is spatially and temporally correlated. At narrow-beam LEO base stations (BSs), spatial interference can vary significantly, and multipath fading introduces temporal variation. While developing novel stochastic geometry analysis in a multibeam scenario, we explore spatio-temporal interference correlation in the LEO uplink. We derive a closed-form expression for the spatio-temporal interference correlation coefficient. As an application of the analysis, we show that the signal-to-interference ratio (SIR) entails significant spatial clustering. In this regard, we demonstrate that an appropriately designed grant-free random access scheme, particularly slotted ALOHA, can mitigate spatial SIR clustering over the beams while preserving average throughput. Furthermore, we propose a novel gamma distribution model for the interference power distribution and a Lomax distribution model for the SIR.
