Transmission device and distortion compensation method

摘要

A storage unit stores a first lookup table including a plurality of correction coefficients for I codes, and stores a second lookup table including a plurality of correction coefficients for Q codes. Each of the correction coefficients for I codes and each of the correction coefficients for Q codes are complex numbers. A distortion compensation unit compensates, with one of the plurality of correction coefficients for I codes, distortion of an I code of a transmission signal to generate a first input signal, outputs the first input signal to an SCPA for I codes. The distortion compensation unit compensates, with one of the plurality of correction coefficients for Q codes, distortion of a Q code of the transmission signal to generate a second input signal, and outputs the second input signal to an SCPA for Q codes.

主权项

1. A transmission device comprising:
a storage unit that independently stores a first lookup table that includes a plurality of correction coefficients for I codes, and a second lookup table that includes a plurality of correction coefficients for Q codes, each of the plurality of correction coefficients for I codes and each of the plurality of correction coefficients for Q codes being complex numbers; a distortion compensation unit that compensates, with one of the plurality of correction coefficients for I codes, distortion of an I code of a transmission signal to generate a first input signal, and compensates, with one of the plurality of correction coefficients for Q codes, distortion of a Q code of the transmission signal to generate a second input signal; a first switched-capacitor power amplifier that amplifies the first input signal; and a second switched-capacitor power amplifier that amplifies the second input signal, wherein the number of correction coefficients for I codes included in the first lookup table is a number of non-overlapping adjustment values for I codes, each of the non-overlapping adjustment values for I codes being a value for adjusting a non-overlapping period where both a first switch and a second switch included in the first switched-capacitor power amplifier are in an off-state, with the first switch located between a first power supply and a first output terminal of the first switched-capacitor power amplifier, and the second switch located between the first output terminal and a ground; and the number of correction coefficients for Q codes included in the second lookup table is a number of non-overlapping adjustment values for Q codes, each of the non-overlapping adjustment values for Q codes being a value for adjusting a non-overlapping period where both a third switch and a fourth switch included in the second switched-capacitor power amplifier are in an off-state, with the third switch located between a second power supply and a second output terminal of the second switched-capacitor power amplifier, and the fourth switch located between the second output terminal and the ground.