Patent ID: 7174146

Claim:
A method for I/Q mismatch calibration of a receiver having an I/Q correction module which performs x o [n]=A p Â·x i [n]+B p Â·x* i *[n] where x i [n] and x o [n] respectively represent the input and output signal of the I/Q correction module, the superscript * refers to a complex conjugate, and A p and B p are correction parameters, comprising the following steps: generating a test signal x(t) containing a single tone waveform with frequency of (f c +f T ) Hz, where f c and f T are real numbers; applying I/Q demodulation to reduce the central frequency of the test signal x(t) by f c Hz and output a demodulated signal x dem (t); converting the demodulated signal x dem (t) to a digital signal x dem [n]; obtaining measures U 1 and U 2 of the digital signal x dem [b] where U 1 and U 2 are values indicative of the frequency response of x dem (t) at frequency +f T Hz and âˆ’f T Hz, respectively; and calculating the set of the correction parameters A p and B p for the I/Q correction module based on the measures U 1 and U 2 .