RFID reader and method for adjusting a frame length of an RFID system comprising an RFID reader

US9881187B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Hazem Elsaid Ibrahim · Erlangen, DE
• Hamed Kenawy · Erlangen, DE
• Joerg Robert · Vreden, DE
• Albert Heuberger · Erlangen, DE
• Wolfram Strauss · Nuremberg, DE

Key dates

• Filing date: May 6, 2016
• Grant date: Jan 30, 2018
• Expiry date: Jul 21, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G06K7/10089
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

Embodiments provide an RFID reader. The RFID reader includes a collision detector, a decoder and a frame length adjuster. The collision detector is configured to detect for each slot of a plurality of slots of a current frame, in which a collision of signals transmitted by at least two RFID tags occurred, a signal property of a signal of the signals transmitted by at least two RFID tags. The decoder is configured to decode for the slot in which the collision is detected the signal of the signals transmitted by the at least two RFID tags using the detected signal property, wherein a collision recover probability describing a probability that the decoder can accurately decode the one signal depends on a signal-to-noise ratio (SNR) of the current frame. The frame length adjuster is configured to adjust a frame length of a subsequent frame in dependence on the collision recover probability.