A novel software-radio-defined passive RFID reading system with real-time collision resolution

Authors:
Yuan Sun;Peter J. Hawrylak;Zhi-Hong Mao;Marlin H. Mickle
Affiliations:
Department of Electrical and Computer Engineering, Swanson School of Engineering, University of Pittsburgh, BEH 348, 3700 O;Hara St., Pittsburgh, PA 15260, USA.;Department of Electrical and Computer Engineering, Swanson School of Engineering, University of Pittsburgh, BEH 348, 3700 O;Hara St., Pittsburgh, PA 15260, USA.
Venue:
International Journal of Ad Hoc and Ubiquitous Computing
Year:
2011

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Abstract

The ISO 18000-6C standard defines the air interface of UHF passive RFID tags. According to the timing specification in this standard, a conforming interrogator (or reader) shall complete the inventory round for tags in a soft real time. This research develops a software-defined radio reconfigurable FPGA-based interrogator for the standard to address the stringent time constraints of the tag-reader handshakes. This flexible interrogator is fully customisable and can be utilised for typical applications including standard conformance test automation and large-scale programming for tag groups. Furthermore, on-chip signal processing allows for real-time online collision resolution in a tag-intensive environment and can significantly improve the system reading efficiency.