Patent ID: 8090036

Claim:
A transmitter which transmits a multicarrier signal obtained by combining one or plural modulated carriers, comprising: carrier leak compensating means for adding carrier leak compensation values corresponding to an I phase and a Q phase, respectively, to a received multicarrier signal and outputting a resulting signal; an analog quadrature modulator for up-converting the output signal of the carrier leak compensating means to a radio frequency; feedback means for receiving and quadrature-detecting part of an output signal of the analog quadrature modulator and outputting a feedback signal in which carrier frequencies are substantially the same as those of said multicarrier signal; carrier leak detecting means for detecting an I-phase carrier leak and a Q-phase carrier leak of an amplitude/phase-adjusted feedback signal and the multicarrier signal on the basis of a difference between cumulative addition values, calculated in the same period, of the amplitude/phase-adjusted feedback signal and the multicarrier signal; and carrier leak compensation value control means for determining carrier leak compensation values to be set newly in the carrier leak compensating means on the basis of the detected carrier leaks.