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Distortion-managed digital RF communications transmitter and method therefor

  • US 7,099,399 B2
  • Filed: 01/27/2004
  • Issued: 08/29/2006
  • Est. Priority Date: 01/27/2004
  • Status: Active Grant
First Claim
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1. A method of managing distortion in a digital communications transmitter in which at least a portion of said distortion is introduced by analog-transmitter components, said method comprising:

  • obtaining a forward-data stream configured to convey digital information;

    down-converting a feedback signal obtained from said analog-transmitter components using a digital-subharmonic-sampling downconverter to generate a return-data stream;

    training a linear predistorter which is responsive to said forward-data stream and is located upstream of said analog-transmitter components to compensate for linear distortion introduced by said analog-transmitter components, said linear predistorter training activity including determining filter coefficients for an equalizer which filters said forward-data stream and processing said return-data-stream to generate said filter coefficients; and

    training a nonlinear predistorter which is responsive to said forward-data stream and is located upstream of said analog-transmitter components to compensate for nonlinear distortion introduced by said analog-transmitter components.

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