高空平台站辅助下行链路在正交与全频率复用下的RSMA性能分析

中文摘要 AI 辅助

本文分析了采用速率分割多址（RSMA）的高空平台站（HAPS）辅助下行链路的 outage 性能。将考虑自由空间路径损耗、雨衰和大气吸收的现实链路预算与依赖于仰角的阴影莱斯衰落相结合。针对正交频率分配和全频率复用，推导了 outage 概率和吞吐量的闭式表达式，其中聚合波束间干扰通过矩匹配的 Gamma 随机变量近似，并利用其拉普拉斯变换得到可处理的有限和表达式。通过蒙特卡洛模拟验证了解析表达式，显示出良好的一致性。数值结果表明，最优公共流功率分配取决于发射功率，而频率复用下的波束间干扰引入了正交分配中不存在的 outage 下限，为 HAPS-RSMA 系统提供了实用的设计见解。

英文摘要

This paper analyzes the outage performance of a high-altitude platform station (HAPS)-assisted downlink employing rate-splitting multiple access (RSMA). A realistic link budget accounting for free-space path loss, rain attenuation, and atmospheric absorption is combined with elevation-angle-dependent shadowed Rician fading. Closed-form outage probability and throughput expressions are derived for orthogonal frequency allocation and full frequency reuse, where the aggregate inter-beam interference is approximated by a moment-matched Gamma random variable, yielding a tractable finite-sum expression via its Laplace transform. The analytical expressions are validated through Monte Carlo simulations, showing close agreement. Numerical results show that the optimal common stream power allocation depends on the transmit power, while inter-beam interference under frequency reuse introduces an outage floor absent under orthogonal allocation, providing practical design insights for HAPS-RSMA systems

发表机构

• University of Oulu（奥卢大学）

机构由 AI 辅助整理，请以论文原文为准。