AI 中文总结
该研究对比了双极化RIS与双极化NCR的可达速率性能，建立统一分析框架推导闭式速率表达式，发现RIS适用于短距、大阵列场景，NCR更适合长距部署。
AI 中文摘要
我们研究点对点无线链路中双极化无源可重构智能表面（RIS）与双极化网络控制中继（NCR）的可达速率性能。RIS依靠无源波束成形获得大阵列增益，NCR则利用极化分支间的有源放大。我们开发了统一分析框架，可捕捉不同功率预算模型下放大、噪声传播及部署几何的影响，推导了闭式速率表达式，确定了NCR最优的单流与双流传输策略。结果表明，RIS在短距离场景具竞争力且受益于大阵列尺寸，而NCR因能通过放大补偿路径损耗，在长距离部署中更具优势。
英文摘要
We study the achievable rate performance of dual-polarized passive reconfigurable intelligent surfaces (RISs) and dual-polarized network-controlled repeaters (NCRs) in a point-to-point wireless link. While RISs rely on passive beamforming with large array gains, NCRs exploit active amplification across polarization branches. We develop a unified analytical framework that captures the impact of amplification, noise propagation, and deployment geometry under different power-budget models. Closed-form rate expressions are derived, and the optimal one-stream and two-stream transmission strategies for NCRs are characterized. The results reveal that RISs are competitive in short-range scenarios and benefit from large array sizes, whereas NCRs become preferable in long-range deployments due to their ability to compensate for pathloss through amplification.
Comments5 pages, 2 figures, to be presented at IEEE SPAWC 2026
