Patent ID: 7855666

Claim:
A method for compensating a transmit signal comprising at least two modulated carriers, the method comprising: mixing a first modulated carrier of the at least two modulated carriers with a first predetermined signal to reproduce a first component of the transmit signal at an intermediate frequency; converting the first component of the transmit signal to a corresponding digital signal; mixing the digital signal with a second predetermined signal to reproduce the first component of the transmit signal at a baseband frequency; mixing the digital signal with a third predetermined signal to reproduce a portion of a second component of the transmit signal at the baseband frequency; and estimating an amplitude mismatch and a phase mismatch between the at least two modulated carriers of the transmit signal based on (i) the first component of the transmit signal at the baseband frequency and (ii) the portion of the second component of the transmit signal at the baseband frequency.