On phase-based localization with narrowband backscatter signals

Abstract

Backscatter communication is widely adopted for radio-frequency identification (RFID). Recently, the possibility of localizing passive tags or readers, exploiting phase measurements from backscatter signals, received large attention. In particular, several applications with standard ultra-high frequency (UHF) RFID were proposed, thanks to the availability of the phase information in many commercial readers, without requiring any hardware modification. In this paper, the problem of localizing a tag or a reader using phase measurements is addressed from the estimation theory point of view. The derived structure for the maximum likelihood estimator is compared with other approaches proposed in the literature, showing its enhanced performance in a typical application context.

LOS/NLOS Near-Field Localization With a Large Reconfigurable Intelligent Surface

“…. , N. It is worth underlining that the localization exploiting the phase profile of a narrowband signal (i.e., singlecarrier) is one of the techniques used in RFID systems [37].…”

Novel UHF-RFID Listener Hardware Architecture and System Concept for a Mobile Robot Based MIMO SAR RFID Localization

“…As stated above, phase evaluating systems are most promising in achieving the best localization results, although the phase is 360 • -periodic, which means that a set of data with differing signal conditions, that is, differing signal paths, have to be taken to estimate a unique position [41]. Furthermore, the placement of the antennas and the system configuration play an important role in accuracy and uniqueness of the position estimation.…”