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arXiv 2202.03273eess.SPcs.ET
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基于波控超表面的可重构智能表面

Wave-Controlled Metasurface-Based Reconfigurable Intelligent Surfaces

Ender Ayanoglu, Filippo Capolino, A. Lee Swindlehurst

AI总结:

本文提出波控RIS架构,通过考虑相邻单元局部反射相位的最大变化,免除逐单元独立控制所需的密集布线,并结合信号处理与机器学习提升无线、雷达及导航系统的频谱共存效率。

摘要:

可重构智能表面(RIS)是可编程超表面,能够通过采用可控相移单元,自适应地将接收到的电磁能量导向期望方向。除其他用途外,RIS可以改变传播环境,以便为原本无法由基站到达的用户位置提供无线接入。或者,RIS可以将波束从空间中的特定位置引开,以消除干扰,并使无线网络能够与其他类型的固定无线业务(例如雷达、免许可无线电频段等)共存。本工作中的新颖方法是一种波控架构,该架构适当考虑了相邻RIS单元能够实现的局部反射相位的最大可能变化。它消除了对每个RIS单元进行单独控制所需的密集布线和信号路径的需求,从而大幅减少所需硬件。我们详细说明了这种波控RIS架构,并讨论了在点对点和多小区MIMO系统中利用该架构的信号处理和机器学习方法。此类实现可在RIS获得广泛应用的下一代无线、雷达和导航系统中带来显著提升。它们有潜力将频谱利用和共存效率提高数个数量级。

英文摘要:

Reconfigurable Intelligent Surfaces (RISs) are programmable metasurfaces that can adaptively steer received electromagnetic energy in desired directions by employing controllable phase shifting cells. Among other uses, an RIS can modify the propagation environment in order to provide wireless access to user locations that are not otherwise reachable by a base station. Alternatively, an RIS can steer the waves away from particular locations in space, to eliminate interference and allow for co-existence of the wireless network with other types of fixed wireless services (e.g., radars, unlicensed radio bands, etc.). The novel approach in this work is a wave-controlled architecture that properly accounts for the maximum possible change in the local reflection phase that can be achieved by adjacent RIS elements. It obviates the need for dense wiring and signal paths that would be required for individual control of every RIS element, and thus offers a substantial reduction in the required hardware. We specify this wave-controlled RIS architecture in detail and discuss signal processing and machine learning methods that exploit it in both point-to-point and multicell MIMO systems. Such implementations can lead to a dramatic improvement in next-generation wireless, radar, and navigation systems where RIS finds wide applications. They have the potential to improve the efficiency of spectrum utilization and coexistence by orders of magnitude.

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。

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