论文标题
RIS辅助MISO通信：最佳梁形和性能分析
RIS-Assisted MISO Communication: Optimal Beamformers and Performance Analysis
论文作者
论文摘要
我们研究了由可重构智能表面（RIS）辅助的多输入单输出（MISO）通信系统。假定具有多个天线的基站（BS）在RIS的帮助下，假定具有多个天线与单人体用户设备（UE）通信。我们假设该系统在BS和RI之间具有视线（LOS）的环境中运行，而RIS-ue链接经历了Rayleigh的褪色。我们为BS和RIS分别提供最佳的活跃和被动光束矢量的封闭形式表达式。然后，通过表征UE接收到的SNR的统计属性，我们将其应用于不同系统性能度量的分析近似值，包括中断概率，平均可实现率和平均符号误差概率（SEP）。通常，我们的结果表明，由于使用多个BS天线，由于RIS所产生的增益可能是可观的，并且可以显着大于获得的收益。
We study a multiple-input single-output (MISO) communication system assisted by a reconfigurable intelligent surface (RIS). A base station (BS) having multiple antennas is assumed to be communicating to a single-antenna user equipment (UE), with the help of a RIS. We assume that the system operates in an environment with line-of-sight (LoS) between the BS and RIS, whereas the RIS-UE link experiences Rayleigh fading. We present a closed form expression for the optimal active and passive beamforming vectors at the BS and RIS respectively. Then, by characterizing the statistical properties of the received SNR at the UE, we apply them to derive analytical approximations for different system performance measures, including the outage probability, average achievable rate and average symbol error probability (SEP). Our results, in general, demonstrate that the gain due to RIS can be substantial, and can be significantly greater than the gains reaped by using multiple BS antennas.
