Patent ID: 7463866

Claim:
A method of calibrating an I/Q mismatch of a direct conversion transmitter comprising: transmitting a packet comprising a known waveform having a two-dimensional I versus Q trajectory via a direct conversion transmitter, wherein an I/Q mismatch of the direct conversion transmitter distorts the known waveform such that the direct conversion transmitter provides a distorted packet including an observed distorted waveform; time aligning the observed distorted waveform with the known waveform; computing a distortion matrix defining the distortion of the known waveform due to the I/Q mismatch of the direct conversion transmitter based on a least squares fit of a distorted version of the known waveform to the observed distorted waveform with respect to components of the distortion matrix applied to the known waveform; and pre-distorting subsequent packets prior to transmission by the direct conversion transmitter based on the distortion matrix, thereby compensating for the I/Q mismatch of the direct conversion transmitter.