全双工传输与智能反射面:机遇与挑战

Gaofeng Pan, Jia Ye, Jianping An, Mohamed-Slim Alouini
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引用次数: 14

摘要

全双工(FD)传输被认为是提高有限频谱资源利用效率的一种很有前途的方法,因为它允许发射和接收同时发生在同一频带上。目前,得益于智能反射面(IRS)技术的发展,一些独特的电磁(EM)功能,如波前整形、聚焦、异常反射、吸收、频移和非互易等,可以通过软控元件在IRS上实现,显示出在不需要硬件成本和几乎零能耗的情况下重新配置无线传播环境的能力。为了共同利用FD传输和IRS的优点,在本文中,我们首先介绍了IRS的几个有利于FD传输的EM功能;然后,提出和讨论了一些FD-enabled IRS系统的设计,并给出了数值结果来证明所获得的效益。最后,对实现FD-enabled IRS系统的挑战和开放问题进行了概述和阐述。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
When Full-Duplex Transmission Meets Intelligent Reflecting Surface: Opportunities and Challenges
Full-duplex (FD) transmission has already been regarded and developed as a promising method to improve the utilization efficiency of the limited spectrum resource, as transmitting and receiving are allowed to simultaneously occur on the same frequency band. Nowadays, benefiting from the recent development of intelligent reflecting surface (IRS), some unique electromagnetic (EM) functionalities, like wavefront shaping, focusing, anomalous reflection, absorption, frequency shifting, and nonreciprocity can be realized by soft-controlled elements at the IRS, showing the capability of reconfiguring the wireless propagation environment with no hardware cost and nearly zero energy consumption. To jointly exploit the virtues of both FD transmission and IRS, in this article we first introduce several EM functionalities of IRS that are profitable for FD transmission; then, some designs of FD-enabled IRS systems are proposed and discussed, followed by numerical results to demonstrate the obtained benefits. Finally, the challenges and open problems of realizing FD-enabled IRS systems are outlined and elaborated upon.
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