Patent ID: 7123896

Claim:
A method for I/Q mismatch calibration in a receiver having an I/Q correction module using parameters A p and B p , the method comprising the steps of: generating an analog test signal x(t) containing cos(2π(f c +f T )t), where f c and f T are predetermined real numbers; applying I/Q demodulation to reduce the central frequency of the signal x(t) by f c Hz and outputting a demodulated signal x dem (t); converting the analog signal x dem (t) to a digital signal x dem [n] with a preset sampling rate of f s Hz; sending the signal x dem [n] into the I/Q correction module using parameters A p and B p and outputting a corrected signal w[n]; obtaining two measures U 1 and U 2 of the corrected signal w[n] where U 1 and U 2 are values indicative of the discrete-Fourier transform of w[n] corresponding to frequency +f T Hz and −f T Hz, respectively; and updating the parameters A p and B p of the I/Q correction module respectively by a first and second function of the two measures U 1 and U 2 , and the current values of the parameters A p and B p ; wherein the initial values of A p and B p are nonzero numbers.