A master thesis from Aalborg University
A Spatial Selective RFID Reader w. Frequency Diversity
Author(s)
Term
10. term
Publication year
2012
Submitted on
2012-05-31
Pages
134 pages
Abstract
This project concerns RFID UHF EPC Class 1 Gen.2 physical layer modifications, in effort towards gaining robust communication and intelligent reader capabilities. The work is two-folded; It presents implementation of and research in a RFID Multi-carrier reader system, to enable tag diversity, combating dispersive channels. Furthermore it presents a solution towards obtaining a reader with the possibility of interrogation zone control, by exploiting de- liberate interference in software preprocessing. Thus, limiting the reconnaissance area of the reader. This constitutes a tool for spatial tag location as well as limiting the well known tag collision challenges presented by a reader talks first protocol. The Multi-carrier reader was successfully implemented and tested, however trails con- ducted towards documenting frequency diversity, showed ambiguous results. Furthermore the deliberate interference concept was proven successful as a tool for limiting the interrogation zone, to prevent all tags in the vicinity to respond. As this project presents work conducted in the field of Software Defined Radio, the imple- mentation and research is realised by the widely used USRP platform in conjunction with the open source GNU Radio software toolkit.
Documents
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