Reconfigurable intelligent surfaces (RISs) are typically used in multi-user systems to mitigate interference among active transmitters. In contrast, this paper studies a setting with a conventional active encoder as well as a passive encoder that modulates the reflection pattern of the RIS. The RIS hence serves the dual purpose of improving the rate of the active encoder and of enabling communication from the second encoder. The capacity region is characterized, and information-theoretic insights regarding the trade-offs between the rates of the two encoders are derived by focusing on the high- and low-power regimes.
翻译:多用户系统通常使用可重新配置的智能表面(RIS)来减轻活跃发射机之间的干扰,与此形成对照的是,本文研究的是使用一种常规的主动编码器和一种调节RIS反射模式的被动编码器的设置,因此,RIS具有双重目的,即提高主动编码器的速率和使第二个编码器能够进行通信。能力区域具有特征,通过侧重于高功率和低功率系统,得出关于两个编码器比率之间取舍的信息理论见解。