Patent ID: 7995685

Claim:
A backscatter interrogator reception method, comprising the successive steps of: sending a continuous carrier signal with a frequency f c from an interrogator to a tag device over a wireless link; transmitting data from the tag device to the interrogator using a modulated backscatter signal; estimating by the interrogator a phase and an amplitude of an inband interferer signal contained in the received modulated backscatter signal and having a frequency f c corresponding to the carrier frequency, said inband interferer signal being an effect of leakage of the carrier signal, said estimating including estimating the phase and the amplitude using the modulated backscatter signal as an input signal; generating by the interrogator a cancellation signal having an opposite phase and a same amplitude as estimated in the estimating step for the inband interferer signal; combining said cancellation signal with the received modulated backscatter signal in order to reduce an influence of the inband interferer signal; and demodulating the received modulated backscatter signal by the interrogator to retrieve the data transmitted from the tag device.