Patent ID: 8064542

Claim:
A method for correcting in-phase/quadrature (“I/Q”) mismatch in a digital signal, comprising: receiving an analog signal; converting the analog signal into a digital representation of the analog signal; providing the digital signal based on the digital representation of the analog signal and a coefficient value; adaptively varying the coefficient value and an adaptive modulus parameter to reduce an amplitude deviation between the digital signal and the adaptive modulus parameter, wherein the coefficient value and the adaptive modulus parameter are adaptively varied by iteratively comparing the digital signal and the adaptive modulus parameter; providing an estimated amplitude mismatch value based on the coefficient value, wherein providing the estimated amplitude mismatch value comprises providing the estimated amplitude mismatch value based on: α =  1 - w ⁡ [ n ] 1 + w ⁡ [ n ]  - 1 , wherein: α is the estimated amplitude mismatch value, and w[n] is the coefficient value at a time n; and providing an estimated phase mismatch value based on the coefficient value.