论文标题
合作双IIRS辅助交流：波束形成设计和功率缩放
Cooperative Double-IRS Aided Communication: Beamforming Design and Power Scaling
论文作者
论文摘要
智能反射表面（IRS）是一项支持高性能无线通信的有前途的技术。通过自适应配置每个被动反射元件的反射幅度和/或相位，IRS可以重塑电磁环境，而有利于信号传输。这封信通过提出和分析双IIRS辅助无线通信系统来推动现有研究。在合理的假设中，从IRS 1到IRS 2的反射通道为等级1（例如，视线通道），我们为两个IRS提出了一个关节被动横梁设计。基于此，我们表明，部署两个合作IRS与总k元素的元素可以产生订单o（k^4）的功率增益，这极大地超过了用订单O（k^2）发电的一个传统IRS的情况。我们的仿真结果验证了部署两个合作IRS的性能明显优于部署一个IRS的IRS的性能，而IRS给出了足够的IRS元素数量。我们还扩展了视线频道模型，以显示不同的频道模型如何影响双IIRS辅助无线通信系统的性能。
Intelligent reflecting surface (IRS) is a promising technology to support high performance wireless communication. By adaptively configuring the reflection amplitude and/or phase of each passive reflecting element on it, the IRS can reshape the electromagnetic environment in favour of signal transmission. This letter advances the existing research by proposing and analyzing a double-IRS aided wireless communication system. Under the reasonable assumption that the reflection channel from IRS 1 to IRS 2 is of rank 1 (e.g., line-of-sight channel), we propose a joint passive beamforming design for the two IRSs. Based on this, we show that deploying two cooperative IRSs with in total K elements can yield a power gain of order O(K^4), which greatly outperforms the case of deploying one traditional IRS with a power gain of order O(K^2). Our simulation results validate that the performance of deploying two cooperative IRSs is significantly better than that of deploying one IRS given a sufficient total number of IRS elements. We also extend our line-of-sight channel model to show how different channel models affect the performance of the double-IRS aided wireless communication system.
