Capture buffer of digital predistortion systems

A method, comprising:

• receiving, by a predistortion module, a baseband signal, the predistortion module comprising at least one predistortion function;
• programming a priority code for each of the at least one predistortion functions so that the processed baseband signal transmitted from the predistortion module corresponds to a transmission power of a power amplifier;
• sending, by a model calculator, a trigger signal to indicate when to capture data from the power amplifier;
• in response to receiving the trigger signal at a trigger module, initiating data capture from the power amplifier;
• sending, by the trigger module, an advanced trigger signal to a capture buffer to capture data from the power amplifier;
• and
• using the captured data to update the at least one predistortion functions, wherein the at least one updated predistortion functions are periodically applied to the processed baseband signal transmitted to the power amplifier to correct performance of the power amplifier at different transmission power levels;
• wherein the initiating data capture comprises searching for data to capture until a trigger with a false value is received;
• preferably the initiating data capture comprises:
• discarding data in the process of being captured when a false value for the trigger is received, or retaining data captured before the false value for the trigger is received.

An apparatus, comprising:

• means for receiving, by a predistortion module, a baseband signal, the predistortion module comprising at least one predistortion function;
• means for programming a priority code for the at least one predistortion function so that the processed baseband signal transmitted from the predistortion module corresponds to a transmission power of a power amplifier;
• means for sending, by a model calculator, a trigger signal to indicate when to capture data from the power amplifier;
• in response to receiving the trigger signal at a trigger module, means for initiating data capture from the power amplifier;
• means for sending, by the trigger module, an advanced trigger signal to a capture buffer to capture data from the power amplifier;
• and
• means for using the captured data to update the at least one predistortion functions, wherein the at least one updated predistortion functions are periodically applied to the processed baseband signal transmitted to the power amplifier to correct performance of the power amplifier at different transmission power levels;
• wherein the means for initiating data capture comprises means for searching for data to capture until a trigger with a false value is received;
• preferably the means for initiating data capture comprises:
• means for discarding data in the process of being captured when a false value for the trigger is received, or means for retaining data captured before the false value for the trigger is received.