Radio-frequency Identification (RFID) technology development has experienced tremendous growth over the past decade thanks to organizations such as the US Department of Defense and commercial supply chain logistics. While the traditional use of RFID is for asset management, advances in semiconductor technology have led to lower power and more capable integrated circuits. These advances have led the wireless sensor network (WSN) community to ever increasingly look towards RFID-enabled sensors for their applications. GNU Radio provides a powerful tool for RFID researchers because of its flexibility, DSP block availability, 'real-time' data processing ability, and its rapid development time. This talk will focus on the researcher's experience using GNU Radio with a USRP as baseband logic for digital data backscatter from RFID-enabled sensors. GNU Radio paired with the 'RFID-enabled Sensing Testbed' (R.E.S.T.), a versatile RFID development platform, has enabled true microwave (5.8 GHz) backscatter application development. Projects to date have included concussion monitoring sensors, temperature sensors, and chemical vapor sensors.

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