论文标题
RIS AID的多用户MMWAVE系统的错误传播和架空降低了通道估计
Error Propagation and Overhead Reduced Channel Estimation for RIS-Aided Multi-User mmWave Systems
论文作者
论文摘要
在本文中，我们提出了一种新型的基于两阶段的上行链路通道估计策略，其飞行员开销降低，可重新配置的智能表面（RIS）辅助表面（MU）毫米波（MMWave）系统的误差传播。具体而言，在第I阶段，使用了经过精心设计的RIS相移矩阵并引入了匹配的矩阵，所有用户共同估计了共同RIS基座站（BS）渠道的不同路径之间的相关因子，从而实现了显着的多用户多样性增益。然后，使用MMWave通道的固有缩放率和角度歧义来构建由估计的相关因子组成的模棱两可的公共RIS-BS通道。在第二阶段，构建了模棱两可的普通RIS-BS通道，每个用户使用降低的飞行员独立估算其特定的用户 - 频道，以获取整个级联通道。分析了该方法所需的试点的理论数量，并提出了仿真结果以验证该策略的有效性。
In this paper, we propose a novel two-stage based uplink channel estimation strategy with reduced pilot overhead and error propagation for a reconfigurable intelligent surface (RIS)-aided multi-user (MU) millimeter wave (mmWave) system. Specifically, in Stage I, with the carefully designed RIS phase shift matrix and introduced matching matrices, all users jointly estimate the correlation factors between different paths of the common RIS-base station (BS) channel, which achieves significant multi-user diversity gain. Then, the inherent scaling ambiguity and angle ambiguity of the mmWave cascaded channel are utilized to construct an ambiguous common RIS-BS channel composed of the estimated correlation factors. In Stage II, with the constructed ambiguous common RIS-BS channel, each user uses reduced pilots to estimate their specific user-RIS channel independently so as to obtain the entire cascaded channel. The theoretical number of pilots required for the proposed method is analyzed and the simulation results are presented to validate the effectiveness of this strategy.
