This lecture discusses the receiver architecture of a backscatter reader, explaining the nature of coherent detection and direct down-conversion. The nature of these receivers introduces interesting behavior in terms of noise, sensitivity, and dynamic range. A discussion of the “orange noise” model for these receivers is included.
WWB15: Backscatter Demodulation
Paper: G.D. Durgin, C.R. Valenta, M.B. Akbar, M.M. Morys, B.R. Marshall, Y. Lu. “Modulation and Sensitivity Limits for Backscatter Receivers.” IEEE RFID Conference, Orlando, FL. May 2013.