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Transmit (TX) interference canceller and power detector

  • US 8,942,314 B2
  • Filed: 03/14/2013
  • Issued: 01/27/2015
  • Est. Priority Date: 03/14/2013
  • Status: Expired due to Fees
First Claim
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1. A method for Tx interference cancellation and power detection in a wireless device, the method comprising:

  • down-converting a portion of a Tx output signal to generate a feedback signal;

    generating a reconstructed interference signal and a weight based on the feedback signal;

    phase shifting the reconstructed interference signal based on the weight to produce an aligned reconstructed interference signal;

    detecting a Tx power level based on the weight; and

    subtracting the aligned reconstructed interference signal from a filtered baseband TX signal,wherein the feedback signal comprises a first baseband feedback signal and a second baseband feedback signal, and wherein generating the reconstructed interference signal and the weight based on the feedback signal comprises;

    receiving the first baseband feedback signal and the second baseband feedback signal in a first portion of a least mean-square cancellers and receiving a filtered baseband Tx Q signal and a filtered baseband Tx I signal in the first portion of the least mean-square cancellers, wherein the first portion of the least mean-square cancellers produces said weight comprising a first weight and a second weight;

    receiving the first weight and the second weight in a second portion of the least mean-square cancellers and receiving the filtered baseband Tx Q signal and the filtered baseband Tx I signal in the second portion of the least mean-square cancellers, wherein the second portion of the least mean-square cancellers produces a first desired Tx signal and a second desired Tx signal; and

    subtracting the first desired Tx signal from the first baseband feedback signal and subtracting the second desired Tx signal from the second baseband feedback signal to produce said reconstructed interference signal.

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