Patent ID: 8374297

Claim:
A method for dynamic estimation and cancellation of phase and gain imbalance in quadrature signal paths of a receiver, comprising: removing any DC offset present in the quadrature signal paths; applying an initial gain compensation value and an initial phase compensation value; generating an estimate of gain imbalance and an estimate of phase imbalance present between the quadrature signal paths comprises: determining when a data length reaches a first threshold value; determining when the auto correlation of the second signal exceeds a second threshold value; determining a present frequency band of operation; determining a present range of mixer gain; and saving the estimate of the gain imbalance and the estimate of the phase imbalance such that the presence of the estimate of the gain imbalance and the estimate of the phase imbalance can be confirmed and the estimate of the phase imbalance and the estimate of the gain imbalance retrieved responsive to the frequency band and the range of mixer gain; generating a modified gain compensation value as a function of the estimate of the gain imbalance and the initial gain compensation value; generating a modified phase compensation value as a function of the estimate of the phase imbalance and the initial phase compensation value; and making a determination whether to apply the modified gain compensation and the modified phase compensation values in the quadrature signal paths of the receiver.