论文标题
双IRS辅助多用户MIMO：合作无源波束设计
Double-IRS Assisted Multi-User MIMO: Cooperative Passive Beamforming Design
论文作者
论文摘要
智能反射表面（IRS）已成为一种能够实现智能和可重新配置的无线通信环境的能力。 IRS上的先前工作主要考虑其无带信号反射的无源波束设计和性能优化，因此并未揭示多IRS辅助无线网络的全部潜力。在本文中，我们使用\ emph {Cooperative}的无源波束形成设计研究了双IRS辅助多用户通信系统，该设计从Inter-IRS通道中捕获了乘型波束形成增益。 Under the general channel setup with the co-existence of both double- and single-reflection links, we jointly optimize the (active) receive beamforming at the base station (BS) and the cooperative (passive) reflect beamforming at the two distributed IRSs (deployed near the BS and users, respectively) to maximize the minimum signal-to-interference-plus-noise ratio (SINR) of all users.此外，对于单用户和多用户设置，我们分析以最大信号噪声比（SNR）和多用户有效的通道级别来分析表明，双IRS合作系统的卓越性能优于常规单人IRS系统。仿真结果验证了我们的分析结果，并显示了通过合作无源光束设计设计的拟议双IIR系统的实际优势。
Intelligent reflecting surface (IRS) has emerged as an enabling technology to achieve smart and reconfigurable wireless communication environment cost-effectively. Prior works on IRS mainly consider its passive beamforming design and performance optimization without the inter-IRS signal reflection, which thus do not unveil the full potential of multi-IRS assisted wireless networks. In this paper, we study a double-IRS assisted multi-user communication system with the \emph{cooperative} passive beamforming design that captures the multiplicative beamforming gain from the inter-IRS channel. Under the general channel setup with the co-existence of both double- and single-reflection links, we jointly optimize the (active) receive beamforming at the base station (BS) and the cooperative (passive) reflect beamforming at the two distributed IRSs (deployed near the BS and users, respectively) to maximize the minimum signal-to-interference-plus-noise ratio (SINR) of all users. Moreover, for the single-user and multi-user setups, we analytically show the superior performance of the double-IRS cooperative system over the conventional single-IRS system in terms of the maximum signal-to-noise ratio (SNR) and multi-user effective channel rank, respectively. Simulation results validate our analytical results and show the practical advantages of the proposed double-IRS system with cooperative passive beamforming designs.
