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System and method for digital memorized predistortion for wireless communication

  • US 8,731,495 B2
  • Filed: 09/14/2012
  • Issued: 05/20/2014
  • Est. Priority Date: 05/01/2002
  • Status: Expired due to Term
First Claim
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1. A method of operating a power amplifier, the method comprising:

  • initializing the power amplifier;

    establishing pre-computed distortion contributions by training based on pre-compensation training feedback signals representative of output of the power amplifier;

    storing the pre-computed distortion contributions in a lookup table;

    maintaining the lookup table;

    accepting an original value that reflects information to be communicated;

    generating a digital lookup-table key based on the original value;

    retrieving from the lookup table, using the digital lookup-table key, a corresponding pre-computed distortion contribution for the original value;

    distorting the original value based on the corresponding pre-computed distortion contribution to obtain a distorted value to pre-compensate for the nonlinear characteristics of the power amplifier; and

    wirelessly transmitting a pre-distorted signal based on the distorted value;

    wherein establishing pre-computed distortion contributions comprises;

    establishing reference information by training based on reference training feedback signals via feedback channels, the reference training feedback signals being representative of the output of the power amplifier; and

    storing the reference information in a reference table; and

    wherein maintaining the lookup table comprises refraining, once the pre-computed distortion contributions are established, for at least one entire telephone conversation, from further training to establish the pre-computed distortion contributions or the reference information.

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