Phased array transmission device and carrier leak correction method

A phased array transmission device comprising:

• a plurality of transmission branches, each being provided with
• a first DC offset corrector that adds a first correction value to a baseband signal,
• a phase shifter that applies a phase rotation to an output signal of the first DC offset corrector,
• a second DC offset corrector that adds a second correction value to an output signal of the phase shifter,
• a mixer that subjects an output signal of the second DC offset corrector to a frequency conversion to a high frequency band, and
• a detector that detects, using the baseband signal from prior to the phase rotation, a first DC offset that occurs at a stage prior to the phase shifter;
• and
• a correction controller that determines the first correction value on the basis of the first DC offset.

A carrier leak correction method including:

• phase shifting in which a phase rotation is applied to a baseband signal;
• DC offset correcting in which a first correction value is added to an output signal of the phase shifting;
• converting in which an output signal of the DC offset correcting is subjected to a frequency conversion to a high frequency band;
• and
• correction controlling in which a second correction value with which a carrier leak component included in an output signal of the converting is minimized, is calculated for each of a plurality of candidates for a phase rotation amount that is set for the phase rotation, and the first correction value is determined on the basis of the second correction value.

A carrier leak correction method including:

• first DC offset correcting in which a first correction value is added to a baseband signal;
• phase shifting in which a phase rotation is applied to an output signal of the first DC offset correcting;
• second DC offset correcting in which a second correction value is added to an output signal of the phase shifting;
• converting in which an output signal of the second DC offset correcting is subjected to a frequency conversion to a high frequency band;
• detecting in which a first DC offset that occurs at a stage prior to the phase shifting is detected using the baseband signal from prior to the phase rotation;
• and
• correction controlling in which the first correction value is determined on the basis of the first DC offset.