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Digital pre-distortion (DPD) training and calibration system and related techniques

  • US 9,979,421 B2
  • Filed: 03/02/2016
  • Issued: 05/22/2018
  • Est. Priority Date: 03/02/2015
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) transmit system comprising:

  • a controller configured to provide data signals at an output thereof;

    an RF signal generator having an input coupled to the output of said controller, said RF signal generator configured to receive data signals from said controller and in response thereto, to provide an RF signal at an output thereof;

    an RF signal path having a first end coupled to the output of said RF signal generator and having a second end, said RF transmit signal path comprising an RF amplifier;

    an RF coupler coupled to said RF transmit signal path and disposed to couple a portion of an RF signal from said RF transmit signal path;

    an observation receiver having an input and an output, with the input of said observation receiver coupled to said RF coupler and said observation receiver configured to receive the coupled portion of the RF signal from said RF coupler;

    a digital pre-distortion (DPD) system having an input coupled to the output of said observation receiver, said DPD system having stored therein one or more initial DPD values selected to ensure that the RF transmit system operates with a signal integrity which meets a minimum desired performance criteria upon initial power on of the RF transmit system and wherein the DPD system is configured to receive one or more signals from said observation receiver and in response thereto, to adapt one or more DPD values of the RF transmit system over a period of time and a range of operating conditions of the RF transmit system and to provide one or more adapted DPD values to said controller; and

    a supply modulator coupled to receive one or more DPD values from one of;

    said DPD system; and

    said controller.

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