The downlink time-difference-of-arrival (DL-TDOA), which is used for positioning in 3GPP NR, is the time interval that is measured by a user equipment (UE) between the reception of the downlink signals from two different cells. The measurement of the DL-TDOA might be challenging, especially at a cell center, where signals from remote base stations (BSs) are usually very weak. Reconfigurable intelligent Surfaces (RISs) are expected to be part of future communication networks because of their capability to create a smarter controllable radio environment. In this paper, we study whether RIS can replace the function of a remote cell in the DL-TDOA measurement, hence maintaining the localization procedure fully within a single cell. We consider a scenario with one BS and one RIS, and show that the TDOA between the line-of-sight path and the reflected path through the RIS can replace the DL-TDOA measurement in the 3GPP NR recommendations. The DL-TDOA and the time-of-flight measurements between the BS and the UE suffice to accurately localize the UE. The proposed algorithm uses one round trip time (RTT) observation and one TDOA observation in millimeter wave (mmWave) frequencies. We present an extended Kalman filter positioning and tracking algorithm to localize users. Simulation results show that the positioning accuracy of RIS-enabled localization matches that of the two-cell structure while being a cost-effective solution.
Positioning and Tracking Using Reconfigurable Intelligent Surfaces and Extended Kalman Filter
01.06.2022
719169 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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