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Talks and Poster Presentations (with Proceedings-Entry):

C. Angerer, G. Maier, M. Bueno Delgado, M. Rupp, J. Vales Alonso:
"Single Antenna Physical Layer Collision Recovery Receivers for RFID Readers";
Talk: IEEE International Conference on Industrial Technologies, Vina del Mar, Chile; 03-14-2010 - 03-17-2010; in: "Proceedings of the IEEE International Conference on Industrial Technologies", (2010), ISBN: 978-1-4244-5697-0; 1386 - 1391.



English abstract:
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.

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


Electronic version of the publication:
http://publik.tuwien.ac.at/files/PubDat_185064.pdf



Related Projects:
Project Head Christoph Mecklenbräuker:
Christian Doppler Lab "Funktechnologien für nachhaltige Mobilität"


Created from the Publication Database of the Vienna University of Technology.