Energy-Efficient Robust Beamforming for Multi-Functional RIS-Aided Wireless Communication Under Imperfect CSI

IF 8.3 2区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Communications Pub Date : 2024-12-12 DOI:10.1109/TCOMM.2024.3516491

Ailing Zheng;Wanli Ni;Wen Wang;Hui Tian;Chau Yuen

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引用次数: 0

Abstract

The robust beamforming design in multi-functional reconfigurable intelligent surface (MF-RIS) assisted wireless networks is investigated in this work, where the MF-RIS supports signal reflection, refraction, and amplification to address the double-fading attenuation and half-space coverage issues faced by traditional RISs. Specifically, we aim to maximize the system energy efficiency by jointly optimizing the transmit beamforming vector and MF-RIS coefficients in the case of imperfect channel state information (CSI). We first leverage the S-procedure and Bernstein-Type Inequality approaches to transform the formulated problem into tractable forms in the bounded and statistical CSI error cases, respectively. Then, we optimize the MF-RIS coefficients and the transmit beamforming vector alternately by adopting an alternating optimization framework, under the quality of service constraint for the bounded CSI error model and the rate outage probability constraint for the statistical CSI error model. Simulation results demonstrate the significant performance improvement of MF-RIS compared to benchmark schemes. In addition, it is revealed that the cumulative CSI error caused by increasing the number of RIS elements is larger than that caused by increasing the number of transmit antennas.

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不完全CSI下多功能ris辅助无线通信的高能效鲁棒波束形成

本文研究了多功能可重构智能表面（MF-RIS）辅助无线网络中的鲁棒波束形成设计，其中MF-RIS支持信号反射、折射和放大，以解决传统RISs面临的双衰落衰减和半空间覆盖问题。具体来说，我们的目标是在不完全信道状态信息（CSI）的情况下，通过联合优化发射波束形成矢量和MF-RIS系数来最大化系统的能量效率。我们首先利用s -过程和Bernstein-Type不等式方法分别在有界和统计CSI误差情况下将公式化问题转化为可处理的形式。然后，在有界CSI误差模型的服务质量约束和统计CSI误差模型的速率中断概率约束下，采用交替优化框架对MF-RIS系数和发射波束形成矢量进行交替优化。仿真结果表明，与基准方案相比，MF-RIS的性能有显著提高。此外，增加RIS元素数量所引起的累积CSI误差大于增加发射天线数量所引起的累积CSI误差。

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 Transactions on Communications 工程技术-电信学

CiteScore

16.10

自引率

8.40%

发文量

528

审稿时长

4.1 months

期刊介绍： The IEEE Transactions on Communications is dedicated to publishing high-quality manuscripts that showcase advancements in the state-of-the-art of telecommunications. Our scope encompasses all aspects of telecommunications, including telephone, telegraphy, facsimile, and television, facilitated by electromagnetic propagation methods such as radio, wire, aerial, underground, coaxial, and submarine cables, as well as waveguides, communication satellites, and lasers. We cover telecommunications in various settings, including marine, aeronautical, space, and fixed station services, addressing topics such as repeaters, radio relaying, signal storage, regeneration, error detection and correction, multiplexing, carrier techniques, communication switching systems, data communications, and communication theory. Join us in advancing the field of telecommunications through groundbreaking research and innovation.