Power amplification device, transmitter, and power amplification control method

A transmitter comprising:

• a baseband signal generating unit that generates a baseband signal;
• an RF signal generating circuit that converts the baseband signal to an RF signal;
• an amplifier that amplifies the RF signal and outputs the RF signal via an antenna;
• and
• a processor configured to:
• calculate an error signal in accordance with the baseband signal and an output from the amplifier;
• control, in accordance with correlation information on the input signal, intervals of the delay signals which are obtained by giving different amounts of delay to the input signal;
• and
• perform predistortion on the baseband signal by using distortion compensation coefficients and that outputs the input signal subjected to the predistortion to the RF signal generating unit, the distortion compensation coefficients being generated in accordance with delay signals whose intervals are controlled and the error signals.

A power amplification control method comprising:

• calculating an error signal in accordance with a first input signal, which is input to an amplifier, and an output signal, which is associated with the first input signal and is output from the amplifier;
• obtaining delay signals by giving different amounts of delay to a second input signal;
• controlling, in accordance with correlation information on a second input signal, intervals of obtained delay signals;
• performing predistortion on the second input signal by using distortion compensation coefficients that are generated in accordance with the delay signals whose intervals are controlled and the error signal;
• and
• amplifying, using the amplifier, the second input signal that performs the predistortion.

A power amplification device comprising:

• an amplifying unit that amplifies an input signal;
• a processor;
• and a memory, wherein the processor executes:
• calculating an error signal in accordance with an output from the amplifying unit and the input signal;
• controlling, in accordance with correlation information on the input signal, intervals of delay signals which are obtained by giving different amounts of delay to the input signal;
• and
• performing predistortion on the input signal by using distortion compensation coefficients and that outputs the input signal subjected to the predistortion to the amplifying unit, the distortion compensation coefficients being generated in accordance with delay signals whose intervals are controlled and the error signal.