Active-IRS-Aided Wireless Communication: Fundamentals, Designs and Open Issues
Active-IRS-Aided Wireless Communication: Fundamentals, Designs and Open Issues
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Active-IRS 辅助无线通信：基础知识、设计和悬而未决的问题
DOI：
10.1109/mwc.003.2300013
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发表时间：
2023
影响因子：
12.9
通讯作者：
Rui Zhang
中科院分区：
文献类型：
--
作者：
Zhenyu Kang;Changsheng You;Rui Zhang
智能反射面(IRS)是未来无线通信系统中实现智能无线电环境的一种很有前途的技术。现有的研究工作主要考虑的是传统的无功率放大的无源IRS，而本文综述了一种新型的无源IRS，它可以同时实现信号的反射和放大，从而大大扩展了无源IRS的信号覆盖范围。我们首先介绍了有源IRS的基本原理，包括其硬件结构、信号和信道模型，以及与无源IRS进行比较的实际约束条件。然后，讨论了主动IRS辅助无线通信设计中的新问题和新问题，如主动IRS的反射优化、信道估计、部署以及与无源IRS的集成设计。最后，数值结果显示了有源IRS相对于无源IRS和传统有源继电器的潜在性能改进。
Intelligent reflecting surface (IRS) has emerged as a promising technology to realize smart radio environments for future wireless communication systems. Existing works in this line of research have mainly considered the conventional passive IRS that reflects wireless signals without power amplification, while in this article, we give an overview of a new type of IRS, called active IRS, which enables simultaneous signal reflection and amplification, thus significantly extending the signal coverage of passive IRS. We first present the fundamentals of active IRS, including its hardware architecture, signal and channel models, as well as practical constraints, in comparison with those of passive IRS. Then, we discuss new considerations and open issues in designing active-IRS-aided wireless communications, such as the reflection optimization, channel estimation, and deployment for active IRS, as well as its integrated design with passive IRS. Finally, numerical results are provided to show the potential performance gains of active IRS as compared to passive IRS and traditional active relay.