论文标题
两英尺可重构的智能表面辅助$ 2 \ times 2 $ MIMO系统的性能分析
Performance Analysis of a Two-Tile Reconfigurable Intelligent Surface Assisted $2\times 2$ MIMO System
论文作者
论文摘要
我们考虑使用瑞利褪色的两块可重构智能表面（RIS）辅助无线网络和接收器。我们表明，接收到的信噪比（SNR）的平均最佳传输和矢量组合由RIS接收器的左右单数空间给出，并分别传输RIS通道矩阵。此外，RI的两个图块处的最佳相位由后一个空间元素的相位确定。为了进一步研究相补偿的效果，我们从统计学上表征了传播的所有可能组合的平均SNR，并通过从各种模式的中断概率和吞吐量中得出新颖的表达式来表征与后者奇异空间有关的方向。此外，为了进行比较，我们在不存在RI的情况下得出相应的表达式。我们的结果表明，由于RIS的阶段补偿，SNR大约提高了$ 2 $ \，DB。
We consider a two--tile reconfigurable intelligent surface (RIS) assisted wireless network with a two-antenna transmitter and receiver over Rayleigh fading. We show that the average received signal-to-noise-ratio (SNR) optimal transmission and combining vectors are given by the left and right singular spaces of the RIS-receiver and transmit-RIS channel matrices, respectively. Moreover, the optimal phases at the two tiles of the RIS are determined by the phases of the elements of the latter spaces. To further study the effect of phase compensation, we statistically characterize the average SNR of all possible combinations of transmission and combining directions pertaining to the latter singular spaces by deriving novel expressions for the outage probability and throughput of each of those modes. Furthermore, for comparison, we derive the corresponding expressions in the absence of RIS. Our results show an approximate SNR improvement of $2$\,dB due to the phase compensation at the RIS.
