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INTEGRATED CIRCUITS, COMMUNICATION UNITS AND METHODS OF CANCELLATION OF INTERMODULATION DISTORTION

  • US 20110195672A1
  • Filed: 02/11/2010
  • Published: 08/11/2011
  • Est. Priority Date: 02/11/2010
  • Status: Active Grant
First Claim
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1. A wireless communication unit comprising:

  • a transmitter arranged to process a baseband transmit signal to produce a first radio frequency signal for wireless transmission;

    a receiver arranged to receive a second radio frequency signal and convert the second radio frequency signal to a baseband receive signal wherein the receiver comprises a summation module arranged to add a cancellation signal to the baseband receive signal;

    a selectivity element that is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal; and

    an adaptive estimator module comprising a filter arranged to filter the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module.

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