Practical Performance Comparison of 1-D and 2-D Decoding Methods for a Chipless RFID System in a Real Environment

Abstract

A comparison of four decoding methods for a Chipless RFID system was executed by analyzing the read success rate of a frequency-position coding tag with 12-bit of capacity. Scattering parameter measurements have been performed in a real environment, using a fixed antenna, with the tag moving within a 30×30×30 cm 3 volume. Optimal parameters have been obtained based on the decoding success rates of the practical measurements, for background calibration, time-gating, Short Time Fourier Transform (STFT) and Short Time Prony Analysis (STPA) methods. STFT and time-gating showed the best volume reading performance. Time-gating has been found to be the best decoding method for the chipless RFID system employed, as it presented the best performance amongst the other methods while being a less complex, 1-D, approach.

Notes on the Extraction of Aspect-Independent Parameters of Chipless RFID Tags

“…( 10)] with a threshold amplitude a en = 0.001, T avgE = t σ ap 1 en . Detailed discussions on the calculation T avgB and T avgE can be seen in [4], [8]. It is important to note that T avgB = 25 ns in Fig.…”

“…Several approaches have been proposed in the literature aiming for the robust detection of chipless RFID tags. These approaches include matrix pencil method (MPM) [2], short time matrix pencil method (STMPM) [3], short time Prony analysis (STPA) [4], inverse synthetic aperture radar (ISAR) data processing [5], scalar method [6], short time Fourier transform (STFT) [7], and spectrogram method [8].…”

Depolarizing Chipless RFID Tag Made Orientation Insensitive by Using Ground Plane Interaction

“…The proposed chipless RFID tags are not dedicated to be read in contact with a metallic plate and it is a limitation compared to classical grounded chipless RFID tags [4]. However, even in the case of classical grounded chipless RFID tags in contact with a metallic plate, the tag reading is challenging and advanced postprocessing techniques are needed, for example, time windowing and short-time Fourier transform (STFT) averaging [21], [22].…”

Compact Measurement Apparatus for 3D Spherical Read Range Characterization of Chipless RFID

“…In the literature, partial reading zone of the chipless RFID tags has been characterized: tag moving on a conveyor belt [19], at different stepped positions [20], tag moving within 30×30×30 cm 3 volume [21], tag at various aspect angles (including within 20×20×20 cm 3 volume) [22], tag rotating in E and H planes of reading antenna [23], and tag oriented at different elevation and azimuth angles [24]. In all these works, the tags are placed in a plane perpendicular to the direction of the antenna.…”