Patent ID: 7778354

Claim:
A communicating apparatus comprising: a local signal generator that generates a first local signal having a first phase and a second local signal having a second phase that is different from the first phase, the local signal generator being configured to change a phase difference between the first and second phases; an orthogonal modulator that modulates an input signal into a modulation signal by using the first local signal; a first compensator that corrects an orthogonal modulation error generated in the orthogonal modulator; an orthogonal demodulator that demodulates the modulation signal into a demodulation signal by using the second local signal; a second compensator that corrects an orthogonal demodulation error generated in the orthogonal demodulator; and a compensation controller that calculates a first set value to be set to the first compensator and a second set value to be set to the second compensator based on: (1) the phase difference; (2) the input signal; and (3) the demodulation signal, wherein the compensation controller calculates the first and second set values by use of a model including: an imaginary modulator modeling the orthogonal modulator; an imaginary rotation modeling the phase difference of the local signal generator; and an imaginary demodulator modeling the orthogonal demodulator, and wherein the compensation controller refers the imaginary rotation as a parameter including an error.