Patent ID: 8396433

Claim:
A radio communication apparatus comprising: a quadrature modulator that quadrature-modulates an outgoing signal by using a carrier wave having a frequency different from a frequency at a receiving side during carrier leak adjustment; a feedback unit that feeds a modulated wave resulting from the quadrature modulation by the quadrature modulator back to the receiving side; a quadrature demodulator that quadrature-demodulates the modulated wave fed back by the feedback unit; a phase locker that locks a phase of a signal resulting from the quadrature demodulation by the quadrature demodulator to match the phase to a phase at the transmitting side; an offset detector that detects a direct-current offset by time-averaging the signal with a phase locked by the phase locker; a first offset adjuster that, on the basis of the value of the direct-current offset detected by the offset detector, corrects a direct-current offset of the outgoing signal to be quadrature-modulated by the quadrature modulator; a third offset adjustor that corrects a direct-current offset of the signal on the basis of a value of a direct-current offset detected in the signal with the phase locked by the phase locker; a pattern generator that generates a predetermined pattern to be input into the direct-current modulator during carrier leak adjustment; and a pattern detector that detects the pattern in a signal in which a direct-current offset has been corrected by the third offset adjuster to determine a carrier recovery phase.