RSMA赋能地面用户在HAPS同信道干扰下的中断分析

中文摘要 AI 辅助

地面网络（TNs）与基于高空平台站（HAPS）的非地面网络（NTNs）共存是扩展6G连接的一种有前景的方法，但由此产生的跨网络干扰可能显著影响TN的可靠性。本文研究了一个基于速率分割多址接入（RSMA）的TN，在多波束HAPS-NTN系统干扰下运行。期望的TN链路采用Nakagami-m衰落建模，而聚合的HAPS干扰则用阴影莱斯衰落表征。通过表征聚合干扰并考虑完美和不完美的连续干扰消除（SIC），推导出闭式中断概率表达式。使用蒙特卡洛模拟验证解析结果，并考察HAPS发射功率、干扰波束数量以及SIC不完善性的影响。结果表明，干扰与信号功率的缩放比例是决定TN中断行为的关键因素，联合缩放的HAPS干扰导致干扰受限性能。此外，与非正交多址接入（NOMA）相比，RSMA提供了改进的中断性能，特别是在存在HAPS干扰的情况下。

英文摘要

The coexistence of terrestrial networks (TNs) with high-altitude platform station (HAPS)-based non-terrestrial networks (NTNs) is a promising approach for extending 6G connectivity, but the resulting cross-network interference can significantly affect TN reliability. This paper investigates an rate-splitting multiple access (RSMA)-based TN operating under interference from a multibeam HAPS-NTN system. The desired TN links are modeled using Nakagami-m fading, while the aggregate HAPS interference is characterized by shadowed-Rician fading. Closed-form outage probability expressions are derived by characterizing the aggregate interference and accounting for both perfect and imperfect successive interference cancellation (SIC). Monte Carlo simulations are used to verify the analytical results and to examine the effects of HAPS transmit power, the number of interfering beams, and SIC imperfections. The results demonstrate that the interference-to-signal power scaling is a key factor determining TN outage behavior, with jointly scaled HAPS interference leading to interference-limited performance. Moreover, RSMA provides improved outage performance compared with non-orthogonal multiple access (NOMA), particularly in the presence of HAPS interference

发表机构

• Department of Electronics and Communication Engineering, MNNIT, Allahabad, Prayagraj 211004, India（印度普拉亚格拉杰阿拉哈巴德MNNIT电子与通信工程系）
• Centre for Wireless Communications, University of Oulu, Finland（芬兰奥卢大学无线通信中心）

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