论文标题
无线通信系统的两次计算传输设计在主动RIS的帮助下
Two-Timescale Transmission Design for Wireless Communication Systems Aided by Active RIS
论文作者
论文摘要
本文考虑了一个可活动的可重构智能表面（RIS）辅助通信系统，其中M-Antenna基站（BS）通过N-元素Active RIS将数据符号传输到单人体用户。我们在系统中使用了两个频率的通道状态信息（CSI），以便可以大大减少通道估计开销和反馈开销。得出了可实现速率（AR）的封闭形式的近似表达，并优化了活动RIS处的相移。此外，我们将活动RIS系统的性能与被动RIS系统的性能进行了比较。结论表明，主动RIS系统比被动RIS系统实现了啤酒AR。
This paper considers an active reconfigurable intelligent surface (RIS)-aided communication system, where an M-antenna base station (BS) transmits data symbols to a single-antenna user via an N-element active RIS. We use two-timescale channel state information (CSI) in our system, so that the channel estimation overhead and feedback overhead can be decreased dramatically. A closed-form approximate expression of the achievable rate (AR) is derived and the phase shift at the active RIS is optimized. In addition, we compare the performance of the active RIS system with that of the passive RIS system. The conclusion shows that the active RIS system achieves a lager AR than the passive RIS system.
