JrCUP: Joint RIS Calibration and User Positioning for 6G Wireless Systems
Journal article, 2024

Reconfigurable intelligent surface (RIS)-assisted localization has attracted extensive attention as it can enable and enhance localization services in extreme scenarios. However, most existing works treat RISs as anchors with known positions and orientations, which is not realistic in applications with mobile or uncalibrated RISs. This work considers the joint RIS calibration and user positioning (JrCUP) problem with an active RIS. We propose a novel two-stage method to solve the considered JrCUP problem. The first stage comprises a tensor-estimation of signal parameters via rotational invariance techniques (tensor-ESPRIT), followed by a channel parameters refinement using least-squares. In the second stage, a two-dimensional search algorithm is proposed to estimate the three-dimensional user and RIS positions, one-dimensional RIS orientation, and clock bias from the estimated channel parameters. The Cramér-Rao lower bounds of the channel parameters and localization parameters are derived to verify the effectiveness of the proposed tensor-ESPRIT-based algorithms. In addition, simulation results reveal that the active RIS can significantly improve the localization performance compared to the passive case under the same system power supply in practical regions. Moreover, we observe the presence of blind areas with limited JrCUP localization performance, which can be mitigated by either leveraging more prior information or deploying extra base stations.

Phase shifters

tensor-ESPRIT

reconfigurable intelligent surface

RIS calibration

Channel estimation

Three-dimensional displays

Central Processing Unit

Power supplies

Calibration

Location awareness

positioning

5G/6G

Author

Pinjun Zheng

King Abdullah University of Science and Technology (KAUST)

Hui Chen

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Tarig Ballal

King Abdullah University of Science and Technology (KAUST)

Mikko Valkama

University of Tampere

Henk Wymeersch

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Tareq Al-Naffouri

King Abdullah University of Science and Technology (KAUST)

IEEE Transactions on Wireless Communications

15361276 (ISSN) 15582248 (eISSN)

Vol. 23 6 6683-6698

Reconfigurable Intelligent Sustainable Environments for 6G Wireless Networks

European Commission (EC) (EC/2020/101017011), 2021-01-01 -- 2023-12-31.

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Communication Systems

Signal Processing

DOI

10.1109/TWC.2023.3336177

More information

Latest update

6/29/2024