Adaptive echo cancellation for RFID systems
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United States of America Patent
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Nov 7, 2017
Grant Date -
Dec 4, 2014
app pub date -
May 28, 2014
filing date -
May 29, 2013
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Abstract
A radio-frequency identification (RFID) reader having fast-adaptive echo cancellation for backscatter-modulated signals is described. The echo cancellation includes subtracting an RF-level cancel signal from the received signal, where the cancel signal is generated based upon an error measured in the receive signal after down-conversion to baseband and low-pass filtering. The cancel signal is based upon a cumulative sum or integral of error signals and an estimated complex-valued transfer function of the scaling circuit. Methods of quick calibration of the reader are described, including accounting for circuit offsets and determining the estimated complex-valued transfer function.
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