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arXiv 2501.02597eess.SP
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用于堆叠智能超表面(SIM)表征与优化的新型综合多端口网络模型

A Novel Comprehensive Multiport Network Model for Stacked Intelligent Metasurfaces (SIM) Characterization and Optimization

Andrea Abrardo, Giulio Bartoli, Alberto Toccafondi

AI总结:

本文提出基于多端口网络理论的综合电磁协作对象模型与SIM优化框架,并通过二维DFT案例证明传统单向、无互耦近似存在显著失配,而完整模型性能优异。

摘要:

可重构智能表面(RIS)是下一代无线通信的变革性技术,可对电磁波传播进行先进控制。尽管RIS已得到广泛研究,但将RIS概念扩展到多层系统的堆叠智能超表面(SIM)却带来了重大的建模与优化挑战。本工作通过引入一种SIM优化框架来应对这些挑战;与以往方法不同,该框架基于一个不依赖特定假设的综合模型,从而使结果具有更广泛的适用性。我们首先提出一种基于多端口网络理论的模型,用于表征一般的电磁协作对象(ECO),并推导ECO优化框架。随后,我们将SIM介绍为一种具有特定架构的ECO,为各种配置下的SIM优化提供洞见,并讨论与每种情形相关的复杂性。最后,我们证明,当假设SIM各层之间为单向传播且忽略SIM单元之间的互耦时,本工作所考虑的综合模型会简化为文献中传统使用的模型。为评估这些假设的适用性,我们开展了一项聚焦于二维DFT实现的案例研究。在此背景下,我们强调这些假设会在SIM模型与完整模型所描述的行为之间引入显著失配,使这些近似不足以用于优化SIM。相反,我们表明采用本文提出的完整模型能够获得优异性能。

英文摘要:

Reconfigurable Intelligent Surfaces (RIS) represent transformative technologies for next-generation wireless communications, offering advanced control over electromagnetic wave propagation. While RIS have been extensively studied, Stacked Intelligent Metasurfaces (SIM), which extend the RIS concept to multi-layered systems, present significant modeling and optimization challenges. This work addresses these challenges by introducing an optimization framework for SIM that, unlike previous approaches, is based on a comprehensive model without relying on specific assumptions, allowing for broader applicability of the results. We first present a model based on multi-port network theory for characterizing a general electromagnetic collaborative object (ECO) and derive a framework for ECO optimization. We then introduce the SIM as an ECO with a specific architecture, offering insights into SIM optimization for various configurations and discussing the complexities associated with each case. Finally, we demonstrate that the comprehensive model considered in this work simplifies to the model traditionally used in the literature when the assumption of unilateral propagation between the levels of the SIM is made, and mutual coupling between the SIM elements is neglected. To assess the applicability of these assumptions, a case study focused on the realization of a 2D DFT was undertaken. In this context, we highlight that these assumptions introduce a significant mismatch between the SIM model and its behavior as described by the complete model, making these approximations inadequate for optimizing the SIM. Conversely, we show that employing the complete model proposed in this paper can yield excellent performance.

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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