发表机构
University of Luxembourg; University of Oulu（卢森堡大学; 奥卢大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究对比透射型RIS与相控阵在车对卫星通信中的应用场景，明确二者优势，指出无源RIS功率效率高、有源RIS可改善链路预算、相控阵适用于高吞吐量场景。
AI 中文摘要
本文研究透射型可重构智能表面（RIS）辅助架构，将其与电扫描相控阵对比，用于未来卫星网络中的车对卫星（D2S）通信部署。我们未将RIS视为相控阵的直接替代品，而是明确了RIS可作为低功率波前成形孔径的工作场景，以及相控阵因高增益和成熟的波束跟踪能力仍具优势的场景。此外，相控阵支持多波束操作，对双连接和无缝切换尤为有利。我们区分模拟、数字和混合相控阵，探讨透射型RIS与可重构发射阵列的关系，强调移动终端的实际轮廓、跟踪和链路预算约束。对比显示，无源RIS具备诱人的功率效率和孔径可扩展性，有源RIS可部分改善链路预算，相控阵在高吞吐量场景中仍更优。
英文摘要
This article studies transmissive reconfigurable intelligent surface (RIS)-assisted architectures. It compares them with electronically steered phased arrays for the deployment of vehicular direct-to-satellite (D2S) communications in future satellite networks. Rather than treating RIS as a direct replacement for phased arrays, we clarify the operating regimes in which RIS can serve as a low-power wavefront-shaping aperture and those in which phased arrays remain preferable because of their high gain and mature beam-tracking capability. Moreover, phased arrays can support multi-beam operation, which is particularly beneficial for dual connectivity and seamless handover. We distinguish analog, digital, and hybrid phased arrays, discuss the relationship between transmissive RIS and reconfigurable transmitarrays, and highlight practical profile, tracking, and link-budget constraints for mobile terminals. The comparison shows that passive RIS offers attractive power efficiency and aperture scalability, active RIS can partially improve the link budget, and phased arrays remain preferable for high-throughput.
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