RIS-Enabled and Access-Point-Free Simultaneous Radio Localization and Mapping
Artikel i vetenskaplig tidskrift, 2024

In the upcoming sixth generation (6G) of wireless communication systems, reconfigurable intelligent surfaces (RISs) are regarded as one of the promising technological enablers, which can provide programmable signal propagation. Therefore, simultaneous radio localization and mapping (SLAM) with RISs appears as an emerging research direction within the 6G ecosystem. In this paper, we propose a novel framework of RIS-enabled radio SLAM for wireless operation without the intervention of access points (APs). We first design the RIS phase profiles leveraging prior information for the user equipment (UE), such that they uniformly illuminate the angular sector where the UE is probabilistically located. Second, we modify the marginal Poisson multi-Bernoulli SLAM filter and estimate the UE state and landmarks, which enables efficient mapping of the radio propagation environment. Third, we derive the theoretical Cramér-Rao lower bounds on the estimators for the channel parameters and the UE state. We finally evaluate the performance of the proposed method under scenarios with a limited number of transmissions, taking into account the channel coherence time. Our results demonstrate that the RIS enables solving the radio SLAM problem with zero APs, and that the consideration of the Doppler shift contributes to improving the UE speed estimates.

phase profile design

Wireless sensor networks



Location awareness

6G mobile communication


Simultaneous localization and mapping



Signal to noise ratio

Poisson multi-Bernoulli

reconfigurable intelligent surface

Doppler shift

Wireless communication


Hyowon Kim

Chungnam National University

Hui Chen

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Musa Furkan Keskin

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Yu Ge

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Kamran Keykhosravi

Ericsson AB

G. C. Alexandropoulos

University of Athens

Sunwoo Kim

Hanyang University

Henk Wymeersch

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

IEEE Transactions on Wireless Communications

15361276 (ISSN) 15582248 (eISSN)

Vol. 23 4 3344-3360

Integrated Sensing, Localization, and Communications in 6G THz Systems

Europeiska kommissionen (EU) (101065422-6G-ISLAC), 2023-01-01 -- 2024-12-31.

Reconfigurable Intelligent Sustainable Environments for 6G Wireless Networks

Europeiska kommissionen (EU) (EC/2020/101017011), 2021-01-01 -- 2023-12-31.


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