Obtaining reliable and specific data for adaptive digital predistortion

A radio frequency (RF) device comprising:

• a nonlinear component;
• a digital predistortion (DPD) actuator circuit to predistort, using DPD coefficients, at least a portion of an input signal, the DPD coefficients associated with a characteristic of the nonlinear component;
• a DPD capture circuit to:
• capture, based on a specified capture cycle timing, multiple bursts of a feedback signal, the feedback signal indicative of an output of the nonlinear component;
• compute, based on the multiple bursts, one or more statistical measures for determining one or more thresholds for a subsequent capture;
• and
• perform the subsequent capture by monitoring the feedback signal for a subsequent portion of the feedback signal that satisfies the one or more thresholds;
• and
• a DPD adaptation circuit to update the DPD coefficients based at least in part on the subsequent portion of the feedback signal that satisfies the one or more thresholds.

A method for performing digital predistortion (DPD), the method comprising:

• predistorting, using a DPD actuator circuit, at least a portion of an input signal based on DPD coefficients associated with a characteristic of a nonlinear component;
• capturing, based on a specified capture cycle timing using a DPD capture circuit, multiple portions of a feedback signal, the feedback signal indicative of an output of the nonlinear component;
• computing, based on one or more statistical measures of the multiple captured portions of the feedback signal, one or more criteria for a subsequent capture of the feedback signal;
• performing the subsequent capture based on the one or more criteria, wherein the performing comprises monitoring the feedback signal until a detection of a subsequent portion of the feedback signal satisfies the one or more criteria;
• and
• updating, using a DPD adaptation circuit, the DPD coefficients based at least in part on the subsequent portion of the feedback signal.