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NFC Reader Transmission Signal Pre-Distorsion

  • US 20150303994A1
  • Filed: 11/21/2013
  • Published: 10/22/2015
  • Est. Priority Date: 11/27/2012
  • Status: Active Grant
First Claim
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1. A method of conditioning a first signal transmitted between a first and a second near field communication, NFC, device, the method comprising:

  • determining a transfer function representative of a distortion arising from transfer of a signal from the first NFC device to the second NFC device by;

    transmitting a second signal from the first NFC device to the second NFC device, the second signal comprising a maximum length sequence, MLS, andcalculating a cross-correlation of the second signal with a version of the second signal modified by the transfer function to thereby derive a measure of the transfer function;

    determining a pre-distortion function from the transfer function; and

    applying the determined pre-distortion function to the first signal, wherein;

    the pre-distortion function at least partially compensates for the determined transfer function.

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