Patent ID: 8452250

Claim:
A DC offset compensation method used in a transmitter for compensating for a component which is contained in a transmit signal produced by modulating two quadrature carriers in accordance with an input signal to be transmitted by said transmitter comprising an in-phase component signal and a quadrature component signal and derived from DC offset contained in said in-phase component signal and said quadrature component signal, said compensation being performed using a DC offset correction value obtained from said transmit signal, wherein: generating a DC offset correction value based on the transmit signal; detecting signal levels of the input signal to be transmitted by the transmitter; weighting the DC offset correction value by multiplying the DC offset correction by a weighting factor reflecting an effect of a variation of detected input signal levels of the input signal to be transmitted by said transmitter on DC offset components; and compensating the DC offset components using the weighted DC offset correction value.