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Digital Predistortion for nonlinear RF power amplifiers

  • US 8,699,620 B1
  • Filed: 04/14/2011
  • Issued: 04/15/2014
  • Est. Priority Date: 04/16/2010
  • Status: Expired due to Fees
First Claim
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1. A method, comprising:

  • generating a digital transmit signal;

    receiving a digital receive signal that is based on an amplified analog version of the digital transmit signal, wherein the amplified analog version is produced by a power amplifier having one or more nonlinear characteristics;

    storing signal samples, the signal samples including (i) transmit samples based on the digital transmit signal and (i) receive samples based on the digital receive signal;

    arranging sample pairs in sample pair groups, each sample pair comprising a transmit sample of the transmit samples and a receive sample of the receive samples, wherein the receive samples of the sample pairs are aligned with the corresponding transmit samples of the sample pairs;

    determining representative sample pairs for at least a portion of the sample pair groups;

    determining gain coefficients based on at least a portion of the signal samples, the gain coefficients being associated with respective first operational ranges of the power amplifier, wherein determining the gain coefficients comprises using the representative sample pairs;

    determining predistortion values, the predistortion values including(i) first values based on the gain coefficients, the first values being associated with the first operational ranges, and(ii) one or more second values based on an extrapolation of at least two of the gain coefficients, the one or more second values being associated with respective one or more second operational ranges of the power amplifier; and

    using the predistortion values to predistort digital signals to compensate for the one or more nonlinear characteristics of the power amplifier.

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