Semi-Passive 3D Positioning of Multiple RIS-Enabled Users
Journal article, 2021

Reconfigurable intelligent surfaces (RISs) are set to be a revolutionary technology in the 6th generation of wireless systems. In this work, we study the application of RIS in a multi-user passive localization scenario, where we have one transmitter (TX) and multiple asynchronous receivers (RXs) with known locations. Classical approaches fail in this scenario due to lack of synchronization and lack of data association between multi-static measurements and users. To resolve this, we consider each user to be equipped with an RIS, and show that we can avoid the data association problem and estimate users' 3D position with submeter accuracy in a large area around the transmitter, using time-of-arrival measurements at the RXs. We develop a low-complexity estimator that attains the corresponding Cram\'er-Rao bound as well as a novel RIS phase profile design to remove inter-path interference.

passive localization

Cramer-Rao lower bounds

Reconfigurable intelligent surfaces

Author

Kamran Keykhosravi

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Furkan Keskin

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Satyam Dwivedi

Ericsson

G. Seco-Granados

Universitat Autonoma de Barcelona (UAB)

Henk Wymeersch

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

IEEE Transactions on Vehicular Technology

0018-9545 (ISSN)

Vol. 70 10 11073-11077

A New Waveform for Joint Radar and Communications Beyond 5G

European Commission (EC) (EC/H2020/888913), 2020-09-01 -- 2022-08-31.

Multi-dimensional Signal Processing with Frequency Comb Transceivers

Swedish Research Council (VR) (2018-03701), 2018-12-01 -- 2021-12-31.

Subject Categories

Telecommunications

Communication Systems

Signal Processing

DOI

10.1109/TVT.2021.3109786

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4/5/2022 5