Joint Pilot-Based Localization and Channel Estimation in RIS-Aided Communication Systems

IF 4.6 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Wireless Communications Letters Pub Date : 2024-09-04 DOI:10.1109/LWC.2024.3454370

Doğa Gürgünoğlu;Emil Björnson;Gabor Fodor

引用次数: 0

Abstract

In this letter, we investigate the use of reconfigurable intelligent surfaces (RISs) to jointly estimate the position and channel of a user equipment (UE) using uplink pilot signals. We consider a setup with a user and a base station (BS), where the direct path between the BS and the UE is blocked and virtual line-of-sight (LOS) links are created over two reconfigurable intelligent surfaces (RISs). We investigate the benefits of exploiting the channel geometry to estimate the user’s position and the user-RIS channels jointly in terms of estimation performance and pilot overhead. To this end, we consider the Cramér-Rao Lower Bound for channel estimation and UE localization. Our numerical results show that exploiting the LOS structure of the channels improves the channel estimation performance by several orders of magnitude and reduces the channel estimation performance by reducing the number of unknown parameters.

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RIS 辅助通信系统中基于先导的联合定位和信道估计

在这封信中，我们研究了利用可重构智能表面（RIS）来联合估计用户设备（UE）的位置和信道。我们考虑了一个用户和一个基站（BS）的设置，在这个设置中，BS 和 UE 之间的直接路径被阻断，在两个可重构智能表面（RIS）上创建了虚拟视线（LOS）链路。我们研究了利用信道几何形状联合估计用户位置和用户-RIS 信道在估计性能和先导开销方面的优势。为此，我们考虑了信道估计和 UE 定位的 Cramér-Rao 下限。我们的数值结果表明，利用信道的 LOS 结构可将信道估计性能提高几个数量级，并通过减少未知参数的数量来降低信道估计性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Wireless Communications Letters Engineering-Electrical and Electronic Engineering

CiteScore

12.30

自引率

6.30%

发文量

481

期刊介绍： IEEE Wireless Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of wireless communications. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of wireless communication systems.