Joint RIS Calibration and Multi-User Positioning
Paper in proceeding, 2022

Reconfigurable intelligent surfaces (RISs) are expected to be a key component enabling the mobile network evolution towards a flexible and intelligent 6G wireless platform. In most of the research works so far, RIS has been treated as a passive base station (BS) with a known state, in terms of its location and orientation, to boost the communication and/or terminal positioning performance. However, such performance gains cannot be guaranteed anymore when the RIS state is not perfectly known. In this paper, by taking the RIS state uncertainty into account, we formulate and study the performance of a joint RIS calibration and user positioning (JrCUP) scheme. From the Fisher information perspective, we formulate the JrCUP problem in a network-centric single-input multiple-output (SIMO) scenario with a single BS, and derive the analytical lower bound for the states of both user and RIS. We also demonstrate the geometric impact of different user locations on the JrCUP performance while also characterizing the performance under different RIS sizes. Finally, the study is extended to a multiuser scenario, shown to further improve the state estimation performance.

Fisher information


reconfigurable intelligent surfaces

joint calibration and positioning

5G New Radio


Yi Lu

Tampere University of Technology

Hui Chen

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Jukka Talvitie

University of Tampere

Henk Wymeersch

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Mikko Valkama

University of Tampere

IEEE Vehicular Technology Conference

15502252 (ISSN)

Vol. 2022-September
9781665454681 (ISBN)

96th IEEE Vehicular Technology Conference
London, United Kingdom,

A flagship for B5G/6G vision and intelligent fabric of technology enablers connecting human, physical, and digital worlds (Hexa-X )

European Commission (EC) (EC/2020/101015956), 2021-01-01 -- 2023-06-30.

European Commission (EC) (EC/HE/101120332), 2023-10-01 -- 2027-09-30.

Subject Categories


Communication Systems



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2/8/2023 1