Patent ID: 7280619
Filing Date: 2007-10-09
Classification: H03D,H04L

Abstract:
1. A method comprising: determining a difference between energies of two baseband quadratures by squaring instantaneous values of the two quadratures, filtering the squared instantaneous values of the two quadratures, and subtracting the filtered energies of the two quadratures; correcting an amplitude imbalance using the difference between the energies of the two quadratures by normalizing the difference between filtered energies of two quadratures, accumulating the normalized difference between filtered energies of two quadratures using an integrator to estimate the amplitude imbalance, and computing correction factors using the estimated amplitude imbalance, wherein the correction factors are one minus the estimated amplitude imbalance and one plus the estimated amplitude imbalance; determining a cross-correlation between the two quadratures; and correcting a phase imbalance using the cross-correlation between the two quadratures.