Spectrum shaping for backscatter modulation

EPC Global US, Class 1 Generation 2 UHF RFID protocol for operation at 860MHz–960MHz. http://www.epcglobalus.org. Karthaus, 2003, Fully integrated passive UHF RFID transponder IC with 16.7 μw minimum RF input power, IEEE J. Solid-State Circuits, 16021608 H. Stockman, Communication by means of reflected power, in: Proc. IRE, Oct. 1948, p. 11961204. A. Koelle, S. Depp, R. Freyman, Short range radio telemetry for electronic identification using modulated RF backscatter, in: Proc. IRE, Aug. 1975, p. 12601261. N. Cho, S.-J. Song, S. Kim, H.-J. Yoo, A 5.1 μw UHF RFID tag chip integrated with sensors for wireless environmental monitoring, in: Proc. 31st Eur. Solid State Circuits Conf., 2005, p. 279282. Muller, 2015, A minimally invasive 64-channel wireless μ-ecog implant, IEEE J. Solid-State Circuits, 10.1109/JSSC.2014.2364824 Thomas, 2012, A battery-free multichannel digital neural/EMG telemetry system for flying insects, IEEE Trans. Biomed. Circuits Syst., 10.1109/TBCAS.2012.2222881 Thomas, 2012, QAM modulated backscattered in passive and semi passive UHF RFID systems, IEEE Trans. Microw. Theory Tech., 11751182 C. Boyer, S. Roy, Coded QAM backscatter modulation for RFID, p. 19251934, July 2012. Cnaan-On, 2015, Multichannel backscatter communication and ranging for distributed sensing with an FMCW radar, IEEE Trans. Microw. Theory Tech., 23752382 Proakis, 2001