Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2011-08-09
2011-08-09
Odom, Curtis B (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C340S010100, C455S041200, C455S041300
Reexamination Certificate
active
07995685
ABSTRACT:
In a backscatter interrogator reception method, a continuous carrier signal with a frequency fcis sent from an interrogator to a tag device over a wireless link, the tag device transmits data to the interrogator using a modulated backscatter signal, and the received modulated backscatter signal is demodulated by the interrogator to retrieve the data transmitted from the tag device. According to the present invention, the interrogator estimates the phase and the amplitude of an inband interferer signal contained in the received modulated backscatter signal, generates a cancellation signal having the opposite phase and the same amplitude as the estimation of the inband interferer signal, and combines said cancellation signal with the received backscatter signal in order to reduce the influence of the inband interferer signal. In addition, a two-stage interferer cancellation scheme is proposed.
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Böhnke Ralf
Rebmann Jochen
Wang Zhaocheng
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Odom Curtis B
Sony Deutschland GmbH
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