[Zurück]

C. Angerer, G. Maier, M. Bueno Delgado, M. Rupp, J. Vales Alonso:
"Single Antenna Physical Layer Collision Recovery Receivers for RFID Readers";
Vortrag: IEEE International Conference on Industrial Technologies, Vina del Mar, Chile; 14.03.2010 - 17.03.2010; in: "Proceedings of the IEEE International Conference on Industrial Technologies", (2010), ISBN: 978-1-4244-5697-0; S. 1386 - 1391.

Radio Frequency Identification (RFID) systems often are operated in environments with multiple RFID tags. In such an environment, a conventional RFID system resolves collisions of multiple tags on the medium access control layer, discarding the signals of the physical layer. This paper proposes a zero-forcing and an interference cancellation receiver architecture for an RFID reader, to recover from collisions of two tags on a physical layer and identify tags successfully even in case of a collision. The expected throughput increase is approximately 1.6 times the throughput of a conventional reader. We explore the signal properties of collisions and propose a model for the physical layer. Moreover, we present a method for estimating the signal constellation states in a collision. The entire structure, including channel estimation and both of the proposed receivers are verified with data generated during a measurement. Additionally, performance simulations of the two structures with different channels are shown.

RFID, collision recovery, collision resolution, receiver, reader, multiple tags, signal separation, framed slotted aloha, physical layer

http://publik.tuwien.ac.at/files/PubDat_185064.pdf

Projektleitung Christoph Mecklenbräuker:
Christian Doppler Lab "Funktechnologien für nachhaltige Mobilität"