QAM backscatter for passive UHF RFID tags

  title={QAM backscatter for passive UHF RFID tags},
  author={Stewart J. Thomas and Matthew S. Reynolds},
  journal={2010 IEEE International Conference on RFID (IEEE RFID 2010)},
Traditional passive UHF RFID tags employ either ASK or PSK backscatter modulation to communicate data from memory or sensors on the tag to a remotely-located reader. These simple modulation schemes transfer data at a rate of one bit per symbol period, which for an integrated CMOS tag IC requires an on-chip oscillator with a frequency at least equal to the bit rate. Motivated by the fact that most modern UHF RFID readers already employ I/Q demodulation of the backscattered signal to account for… CONTINUE READING
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