Patent ID: 7139536

Claim:
A method for I/Q imbalance calibration of a transmitter, comprising the steps of: initializing parameters A p , B p and γ p ; estimating a loop delay factor L; generating a test signal x[n]=x(n·T S ), wherein x(t)=e jω T t and ω T is a preset radian frequency and T S is sampling interval; generating a compensated signal x com [n] by compensating the test signal x[n] according to a first function with parameters A p , B p and γ p ; converting the compensated signal x com [n] to an analog signal x com (t); applying I/Q modulation to the analog signal x com (t) and outputting a modulated signal x mod (t); obtaining a characteristic signal x c (t) of the modulated signal x mod (t); obtaining a sampled characteristic signal x S [n] by sampling the characteristic signal x c (t) and obtaining statistics U 1 and U 2 of the sampled characteristic signal x S [n], where U 1 and U 2 are values indicative of the frequency response of x c (t) at radian frequency ω T and 2ω T , respectively; and updating the parameters A p , B p and γ p respectively by one of the second functions, the loop delay factor L, the statistics U 1 and U 2 , and the current values of the parameters A p , B p and γ p .