Patent ID: 8437385

Claim:
A computer-implemented method for estimating a DC scaling of a signal path between an I/Q modulator of a transmitter and a demodulator of a receiver, the method comprising: directing the transmitter to supply a zero signal as input to the I/Q modulator; receive a first response signal that has been captured from the I/Q demodulator in response to said supplying the zero signal; directing the transmitter to supply a stimulus signal as input to the I/Q modulator, wherein the stimulus signal comprises a constant signal equal to a non-zero complex constant; receive a second response signal that has been captured from the demodulator in response to said supplying the constant signal; averaging the first response signal to obtain a first average and averaging the second response signal to obtain a second average; computing a difference between the second average and the first average; computing the DC scaling based on the difference and the non-zero complex constant; and storing the DC scaling in a memory.