Statistical CSI-Enabled Optimization for Beyond Diagonal SIM

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Wireless Communications Letters Pub Date : 2025-07-01 DOI:10.1109/LWC.2025.3584817

Qiu Xia;Jun Zhang;Kaizhe Xu;Shaodan Ma;Shi Jin;Chau Yuen

引用次数: 0

Abstract

Stacked intelligent metasurfaces (SIM) represent an innovative design comprising multiple metasurface layers, enabling complex signal processing tasks directly in the wave domain. This paradigm not only enhances signal processing efficiency but also reduces hardware costs. However, the traditional single-connected reconfigurable intelligent surface (RIS) architecture limits the design flexibility of SIM. In this letter, we propose a beyond diagonal SIM (BD-SIM) framework, constructed by stacking beyond diagonal RIS (BD-RIS) units, and obtain a large-system approximation of the achievable rate that enables optimal design based on statistical rather than instantaneous channel state information (CSI), thereby reducing signaling overhead. Then, we optimize the phase-shifting matrices for both fully-connected and group-connected BD-SIM by employing a minorize-majorization (MM) algorithm. Results show that BD-SIM, by integrating the strengths of SIM and BD-RIS, further enhances wave-domain signal processing capabilities.

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统计csi支持优化超越对角线SIM

堆叠智能元表面（SIM）代表了一种由多个元表面层组成的创新设计，可以直接在波域中实现复杂的信号处理任务。这种模式不仅提高了信号处理效率，而且降低了硬件成本。然而，传统的单连接可重构智能曲面（RIS）结构限制了SIM的设计灵活性。在这封信中，我们提出了一个超越对角线SIM （BD-SIM）框架，通过堆叠超越对角线RIS （BD-RIS）单元来构建，并获得可实现速率的大系统近似，从而实现基于统计而不是瞬时信道状态信息（CSI）的优化设计，从而减少信令开销。在此基础上，利用最小多数化算法对全连接和群连接BD-SIM的相移矩阵进行了优化。结果表明，BD-SIM结合了SIM和BD-RIS的优点，进一步增强了波域信号处理能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Wireless Communications Letters Engineering-Electrical and Electronic Engineering

CiteScore

12.30

自引率

6.30%

发文量

481

期刊介绍： IEEE Wireless Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of wireless communications. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of wireless communication systems.