论文标题
RIS辅助MMWave MIMO频道的频道估计
Channel Estimation for RIS-Aided mmWave MIMO Channels
论文作者
论文摘要
可重新配置的智能表面（RIS）可以通过被动地改变撞击电磁波的方向来塑造无线电传播。 RI的最佳控制需要通过RIS连接基站（BS）和移动站（MS）的所有链接的完美通道状态信息（CSI）。因此，需要在BS/MS处进行通道（参数）估计，并且需要相关的消息反馈机制。在本文中，我们使用迭代重新加权方法对RIS AID毫米波（MMWave）MIMO通道采用两阶段通道估计方案，以顺序估计通道参数。我们评估了所提出的方案的平均光谱效率（SE）和RIS光束形成增益，并证明它可以实现高分辨率估计，而平均SE与完美的CSI相当。
A reconfigurable intelligent surface (RIS) can shape the radio propagation by passively changing the directions of impinging electromagnetic waves. The optimal control of the RIS requires perfect channel state information (CSI) of all the links connecting the base station (BS) and the mobile station (MS) via the RIS. Thereby the channel (parameter) estimation at the BS/MS and the related message feedback mechanism are needed. In this paper, we adopt a two-stage channel estimation scheme for the RIS-aided millimeter wave (mmWave) MIMO channels using an iterative reweighted method to sequentially estimate the channel parameters. We evaluate the average spectrum efficiency (SE) and the RIS beamforming gain of the proposed scheme and demonstrate that it achieves high-resolution estimation with the average SE comparable to that with perfect CSI.
