Effect of Channel Aging on Beyond Diagonal Reconfigurable Intelligent Surfaces

IF 6.3 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Open Journal of the Communications Society Pub Date : 2024-09-13 DOI:10.1109/OJCOMS.2024.3460055

Anastasios Papazafeiropoulos;Pandelis Kourtessis;Symeon Chatzinotas

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Abstract

Reconfigurable intelligent surface (RIS) has appeared as a revolutionary candidate technology for future sixth-generation (6G) networks, but most works have relied on single-connected reflective RISs, which are mathematically described by diagonal phase shift matrices. In this work, based on the recently presented research on beyond diagonal (BD) RIS unifying different RIS models and architectures towards enhanced advantages such as a greater coverage, we study the impact of channel aging due to user equipment (UE) movement. Especially, we evaluate how channel aging diminishes the system performance of multiple sector BD-RIS systems. Through a robust design, concerning the average sum-rate maximisation problem, we jointly design the BD-matrix and transmit precoder under the channel aging conditions. Numerical results show how channel aging affects performance with respect to fundamental system parameters and shed light on how general aging can be compensated.

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通道老化对超越对角线可重构智能表面的影响

可重构智能表面（RIS）已成为未来第六代（6G）网络的革命性候选技术，但大多数研究都依赖于单连接反射式 RIS，这种 RIS 在数学上用对角相移矩阵来描述。在这项工作中，基于最近提出的超越对角线（BD）RIS 研究，将不同的 RIS 模型和架构统一起来，以增强优势（如更大的覆盖范围），我们研究了用户设备（UE）移动导致的信道老化的影响。特别是，我们评估了信道老化如何降低多扇区 BD-RIS 系统的系统性能。在信道老化条件下，我们通过稳健设计，针对平均和速率最大化问题，联合设计了北斗矩阵和发射前置编码器。数值结果显示了信道老化如何影响基本系统参数的性能，并阐明了如何补偿一般老化。

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来源期刊

IEEE Open Journal of the Communications Society Multiple-

CiteScore

13.70

自引率

3.80%

发文量

审稿时长

10 weeks

期刊介绍： The IEEE Open Journal of the Communications Society (OJ-COMS) is an open access, all-electronic journal that publishes original high-quality manuscripts on advances in the state of the art of telecommunications systems and networks. The papers in IEEE OJ-COMS are included in Scopus. Submissions reporting new theoretical findings (including novel methods, concepts, and studies) and practical contributions (including experiments and development of prototypes) are welcome. Additionally, survey and tutorial articles are considered. The IEEE OJCOMS received its debut impact factor of 7.9 according to the Journal Citation Reports (JCR) 2023. The IEEE Open Journal of the Communications Society covers science, technology, applications and standards for information organization, collection and transfer using electronic, optical and wireless channels and networks. Some specific areas covered include: Systems and network architecture, control and management Protocols, software, and middleware Quality of service, reliability, and security Modulation, detection, coding, and signaling Switching and routing Mobile and portable communications Terminals and other end-user devices Networks for content distribution and distributed computing Communications-based distributed resources control.