A novel simultaneously transmitting and reflecting (STAR) system design relying on reconfigurable intelligent surfaces (RISs) is conceived. First, an existing prototype is reviewed and the potential benefits of STAR-RISs are discussed. Then, the key differences between conventional reflecting-only RISs and STAR-RISs are identified from the perspectives of hardware design, physics principles, and communication system design. Furthermore, the basic signal model of STAR-RISs is introduced, and three practical protocols are proposed for their operation, namely energy splitting, mode switching, and time switching. Based on the proposed protocols, a range of promising application scenarios are put forward for integrating STAR-RISs into next-generation wireless networks. By considering the downlink of a typical RIS-aided multiple-input single-output (MISO) system, numerical case studies are provided for revealing the superiority of STAR-RISs over other baselines, when employing the proposed protocols. Finally, several open research problems are discussed.
翻译：首先,对现有原型进行审查,并讨论STAR-RIS的潜在好处,然后从硬件设计、物理原理和通信系统设计的角度确定常规的仅反映性RIS和STAR-RIS之间的关键差异,此外,还采用了STAR-RIS的基本信号模型,并提出了其运行的三个实用协议,即能源分离、模式转换和时间转换。根据拟议的协议,提出了一系列有希望的应用方案,将STAR-RIS纳入下一代无线网络。通过考虑典型的RIS-辅助多投入单项产出(MISO)系统的下链接,提供了数字案例研究,以揭示STAR-RIS在使用拟议的协议时优于其他基线。最后,讨论了若干开放的研究问题。
相关内容
微信扫码咨询专知VIP会员