Compensation methods and devices for digital power amplifier

A wireless device transmitting Radio Frequency (RF) signal on a wireless medium, comprising:

• one or more digital filters configured to receive and upsample an In-phase (I) component and a Quadrature-phase (Q) component of a baseband sample, wherein the I component is associated with in-phase input amplitude codes and the Q component is associated with quadrature-phase input amplitude codes;
• a Power Amplifier (PA) gain error compensation module coupled to the one or more digital filters, wherein the PA gain error compensation module is configured to:
• distort the in-phase input amplitude codes, based on first gain pre-compensation information corresponding to an in-phase signal branch of the DPA, to thereby generate pre-distorted output amplitude codes of the I component;
• and
• distort the quadrature-phase input amplitude codes, based on second gain pre-compensation information corresponding to a quadrature-phase signal branch of the DPA, to thereby generate pre-distorted output amplitude codes of the Q component, wherein the first gain pre-compensation information is different from the second gain pre-compensation information;
• and
• a Digital Power Amplifier (DPA) coupled to the PA gain error compensation module, the DPA configured to generate an RF output based on the pre-distorted output amplitude codes of the I and Q components.