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CANCELING SELF-JAMMER SIGNALS IN AN RFID SYSTEM

  • US 20090002131A1
  • Filed: 06/29/2007
  • Published: 01/01/2009
  • Est. Priority Date: 06/29/2007
  • Status: Active Grant
First Claim
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1. A method for canceling self-jammer signals in a radio frequency identification (RFID) system comprising:

  • generating a first radio-frequency signal comprising a signal generated at a local oscillator of an RFID reader;

    transmitting the first radio-frequency signal;

    receiving a second radio-frequency signal comprising one or more self-jammer signals, the one or more self-jammer signals comprising the transmitted signal;

    detecting characteristics of the one or more self-jammer signals;

    generating a self-jammer cancellation signal comprising the signal generated at the local oscillator and based, at least in part, on the detected characteristics of the one or more self-jammer signals; and

    canceling the one or more self-jammer signals in a cancellation loop, wherein canceling the one or more self-jammer signals comprises out-phasing the self-jammer signal with the self-jammer cancellation signal.

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