论文标题
RIS辅助毫米波MIMO系统的频道估计
Channel Estimation for RIS-assisted Millimeter-wave MIMO Systems
论文作者
论文摘要
可重新配置的智能表面（RIS）辅助多重输出（MIMO）通信系统中的通道估计是具有挑战性的，因为不能以仅具有被动元素的RIS进行解码或传输飞行员。我们假设用户设备（UE）和RI之间以及RIS和基站（BS）之间的视线通道的角模型，而UE和BS之间没有直接路径。在这封信中，假设我们可以从已知的位置计算RIS-BS通道（高达复杂的路径增益），我们首先讨论估计UE-RIS通道所涉及的歧义。我们提出了一个多个通道探测过程，在该过程中，我们通过不同的RIS相位移动观察通道，并为通道估计提供算法以解决这种歧义。通过模拟，我们表明所提出的方法与Oracle估计量相媲美，Oracle估计器非常了解BS，UE和RIS位置。
Channel estimation in reconfigurable intelligent surface (RIS) assisted multiple input multiple output (MIMO) communication systems is challenging as pilots cannot be decoded at or transmitted from a RIS with only passive elements. We assume an angular model for the line-of-sight channel between the user equipment (UE) and the RIS and between the RIS and the base station (BS) with no direct path between the UE and BS. In this letter, assuming that we can compute the RIS-BS channel (up to a complex path gain) from their known locations, we first discuss the ambiguity involved in estimating the UE-RIS channel. We propose a multiple channel sounding procedure in which we observe the channel through different RIS phase shifts and present an algorithm for channel estimation to resolve this ambiguity. Through simulations, we show that the proposed method is comparable to an oracle estimator, which perfectly knows the BS, UE, and RIS locations.
