Intelligent Reflecting Surface-Aided Wireless Communications: A Tutorial
Intelligent Reflecting Surface-Aided Wireless Communications: A Tutorial
复制标题
DOI：
10.1109/tcomm.2021.3051897
复制
发表时间：
2021-05-01
影响因子：
8.3
通讯作者：
Zhang, Rui
中科院分区：
文献类型：
--
作者：
Wu, Qingqing;Zhang, Shuowen;Zhang, Rui
智能反射面(IRS)是一种能够实现无线电信号在无线网络中传播的技术。IRS通过大量低成本的被动反射元件巧妙地调谐信号反射，能够动态改变无线信道，提高通信性能。因此，预计由IRS协助的包括有源和无源组件的新混合无线网络将非常有希望在未来以具有成本效益的方式实现可持续的容量增长。尽管IRS具有巨大的潜力，但它在有效集成到无线网络中面临着新的挑战，如从通信设计的角度进行反射优化、信道估计和部署。在本文中，我们提供了IRS辅助无线通信的教程概述，以解决上述问题，并详细阐述了其反射和信道模型、硬件体系结构和实际约束，以及在无线网络中的各种有吸引力的应用。此外，我们还强调了在未来工作中值得进一步研究的重要方向。
Intelligent reflecting surface (IRS) is an enabling technology to engineer the radio signal propagation in wireless networks. By smartly tuning the signal reflection via a large number of low-cost passive reflecting elements, IRS is capable of dynamically altering wireless channels to enhance the communication performance. It is thus expected that the new IRS-aided hybrid wireless network comprising both active and passive components will be highly promising to achieve a sustainable capacity growth cost-effectively in the future. Despite its great potential, IRS faces new challenges to be efficiently integrated into wireless networks, such as reflection optimization, channel estimation, and deployment from communication design perspectives. In this paper, we provide a tutorial overview of IRS-aided wireless communications to address the above issues, and elaborate its reflection and channel models, hardware architecture and practical constraints, as well as various appealing applications in wireless networks. Moreover, we highlight important directions worthy of further investigation in future work.