Georgia Tech ECE Research Group
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Signal Constellations of a Retrodirective Array Phase ModulatorGregory A. Koo, MS Thesis 5 April 2011 |
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Greg Koo’s classic MS thesis on the use of retrodirective array phase modulator (RAPM) for microwave backscatter communications. Co-invented with Albert Lu, this method of RF signal transmission has been dubbed “Koo-Lu” modulation by our researchers.
Brian Degnan, Ella Rose, Gregory Durgin
IEEE Journal of Radio Frequency Identification
This work describes how the ultra-low-powered Simon cipher can be implemented with a simple hash. This is a powerful technique for implementing encryption on computational- and power-limited platforms such as RFID tags.
Below is an old article on the prevalence of small-scale fading in radio links that I wrote as a post-doctoral researcher in Japan on the defunct WaveRacer site. I plan on adding a few more of these as part of a retrospective.
Francesco Amato; Hakki M. Torun; Gregory D. Durgin
2017 IEEE International Conference on RFID (RFID)
Year: 2017, Pages: 20 – 25
This paper presents our most ambitious backscatter measurement to date. Drawing microWatts of power at an 5.8 GHz RF tag, a signal is backscattered in free space from the 10th floor of Viewpoint condominium tower to a reader atop ECE’s Van Leer building. This link uses our custom tunnel diode reflection circuitry to achieve a range of 1.2 kilometers.