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The authors present the design and evaluation of a flexible UHF RFID reader that enables new PHY/MAC designs to be prototyped and evaluated. Their reader is built using the USRP software radio platform in conjunction with software they developed in the open-source GNU Radio framework. They believe it is the first inexpensive tool that readily enables changes to the physical and MAC layer of RFID systems. They evaluate their reader and show that it can inventory commercial tags out to 6 meters, which approximates the range of a commercial reader with comparable transmit power. They then show two applications of their reader.
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