论文标题
多个RIS ADED合作网络的中断概率和容量缩放定律
Outage Probability and Capacity Scaling Law of Multiple RIS-Aided Cooperative Networks
论文作者
论文摘要
在这封信中，我们考虑了由多个可重构智能表面（RISS）协助的双跳合作网络。假设选择了最高瞬时信号 - 噪声比（SNR）的RIS来帮助通信，则研究了中断概率（OP）和平均总和率。具体而言，开发了对OP的精确分析。此外，依靠极值理论，基于确定能力缩放定律的渐近OP和渐近总和率的闭合形式表达式。我们的结果通过模拟证实，并提供了深刻的讨论。特别是，我们的分析表明，RIS的数量以及反射元件的数量在多个RIS辅助合作网络的能力缩放定律中起着至关重要的作用。同样，进行了与中继辅助系统的比较，以证明所提出的系统设置优于OP和平均总和率的相关方案。
In this letter, we consider a dual-hop cooperative network assisted by multiple reconfigurable intelligent surfaces (RISs). Assuming that the RIS with the highest instantaneous end-to-end signal-to-noise ratio (SNR) is selected to aid the communication, the outage probability (OP) and average sum-rate are investigated. Specifically, an exact analysis for the OP is developed. In addition, relying on the extreme value theory, closed-form expressions for the asymptotic OP and asymptotic sum-rate are derived, based on which the capacity scaling law is established. Our results are corroborated through simulations and insightful discussions are provided. In particular, our analysis shows that the number of RISs as well as the number of reflecting elements play a crucial role in the capacity scaling law of multiple RIS-aided cooperative networks. Also, comparisons with relay-aided systems are carried out to demonstrate that the proposed system setup outperforms relaying schemes both in terms of the OP and average sum-rate.
