Short-Time Matrix Pencil Method for Chipless RFID Detection Applications

In this paper, the concept of short-time matrix pencil method (STMPM) is introduced and experimentally demonstrated as an efficient approach to extract a set of embedded poles in a chipless RFID. Here, by incorporating a few notches on the elliptical dipole antenna as a chipless RFID, the data is encoded as complex natural resonant frequencies of the structure. In this new detection approach, a sliding time window is introduced and the matrix pencil method (MPM) is applied to extract embedded poles and residues from the sliding time-window at each snapshot of time. The resulting complex poles and residues have a time index which allows us to process them as a set of time-frequency data. This time-frequency analysis enables us to discriminate late-time from early-time. Furthermore, averaging complex poles over the time increases the accuracy of the technique in a noisy environment. The measured data agrees well with our simulations and support the STMPM effectiveness in comparison to the MPM.