集中式有源可重构智能表面：架构、路径损耗分析与实验验证
Centralized active reconfigurable intelligent surface: Architecture, path loss analysis and experimental verification
AI总结：
本文提出集中式有源RIS（CA-RIS）架构，以单个集中式放大反射体减少放大器数量，并通过分析与实验验证其路径损耗和9.6 dB净增益。
摘要：
可重构智能表面（RIS）是6G通信中颇具前景的候选技术。最近，有源RIS被提出，用于补偿无源RIS固有的乘性衰落效应。然而，传统的分布式有源RIS每个单元至少配备一个放大器，存在成本高、结构复杂和功耗大的问题。为应对这些挑战，本文提出一种新型有源RIS架构：集中式有源RIS（CA-RIS），它通过集中式放大反射体放大能量，以减少放大器数量。在该架构下，整个阵列的功率放大仅需少至一个放大器，从而可消除放大器之间的互耦效应，并显著降低成本、噪声水平和功耗。我们评估了CA-RIS的性能，特别是其路径损耗，并将其与传统无源RIS进行比较，揭示出适度的放大增益。此外，所提出的CA-RIS和路径损耗模型得到了实验验证，在4 GHz下相较无源RIS实现了9.6 dB的净增益。CA-RIS在保持性能的同时大幅简化了有源RIS架构，在系统复杂度与性能之间取得了最佳平衡，在多种场景中具有竞争力。
英文摘要：
Reconfigurable intelligent surfaces (RISs) are promising candidate for the 6G communication. Recently, active RIS has been proposed to compensate the multiplicative fading effect inherent in passive RISs. However, conventional distributed active RISs, with at least one amplifier per element, are costly, complex, and power-intensive. To address these challenges, this paper proposes a novel architecture of active RIS: the centralized active RIS (CA-RIS), which amplifies the energy using a centralized amplifying reflector to reduce the number of amplifiers. Under this architecture, only as low as one amplifier is needed for power amplification of the entire array, which can eliminate the mutual-coupling effect among amplifiers, and significantly reduce the cost, noise level, and power consumption. We evaluate the performance of CA-RIS, specifically its path loss, and compare it with conventional passive RISs, revealing a moderate amplification gain. Furthermore, the proposed CA-RIS and the path loss model are experimentally verified, achieving a 9.6 dB net gain over passive RIS at 4 GHz. The CA-RIS offers a substantial simplification of active RIS architecture while preserving performance, striking an optimal balance between system complexity and the performance, which is competitive in various scenarios.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
