Digital Pre-Distortion Circuit, Digital Pre-Distortion Method, and Apparatus

A method, comprising:

• obtaining a first feature of a first input signal, wherein the first feature comprises at least one of an amplitude of the first input signal, an in-phase component of the first input signal, or a quadrature component of the first input signal;
• obtaining a second feature of the first input signal, wherein the second feature comprises at least one of a bandwidth of the first input signal, a temperature at which a digital pre-distortion (DPD) circuit processes the first input signal, a frequency of the first input signal, a modulation format of the first input signal, or a standing wave generated when the DPD circuit processes the first input signal;
• determining, based on the first feature, a first coefficient;
• determining, based on the second feature, a second coefficient;
• generating, based on the first input signal and the first coefficient, a second signal;
• generating, based on the second signal and the second coefficient, a first output signal;
• and
• performing power amplification on the first output signal to generate a second output signal.

A transmitting apparatus, comprising:

• a transceiver configured to receive a first input signal;
• a digital pre-distortion (DPD) circuit configured to:
• obtain a first feature of the first input signal, wherein the first feature comprises at least one of:
• an amplitude of the first input signal, an in-phase component of the first input signal, or a quadrature component of the first input signal;
• obtain a second feature of the first input signal, wherein the second feature comprises at least one of:
• a bandwidth of the first input signal, a temperature at which the DPD circuit processes the first input signal, a frequency of the first input signal, a modulation format of the first input signal, or a standing wave generated when the DPD circuit processes the first input signal;
• determine, based on the first feature, a first coefficient;
• determine, based on the second feature, a second coefficient;
• generate, based on the first input signal and the first coefficient, a second signal;
• generate, based on the second signal and the second coefficient, a first output signal;
• and
• output the first output signal;
• and
• a power amplifier (PA) configured to:
• receive, from the DPD circuit, the first output signal;
• amplify the first output signal to generate a second output signal;
• and
• output the second output signal to the transceiver.