Patent ID: 8036317

Claim:
A receiver for estimation and compensation of phase imbalance or gain imbalance, the receiver comprising: a first circuit structured to estimate the phase imbalance or gain imbalance of I and Q components of an incoming complex signal prior to symbol synchronization, the first circuit structured to generate as an output a ratio of the product of compensated I and Q components and the square of the compensated I component, the first circuit including a first multiplier structured to receive the compensated I and Q signals and to generate a product thereof, and a second multiplier structured to generate the square of the compensated I component, a divider structured to divide the product of the first multiplier by the product of the second multiplier, and an integration circuit that is structured to integrate the output of the divider and to output an integration signal; and a second circuit structured to receive as inputs the uncompensated I and Q components and the output of the first circuit and to output on output terminals the compensated I and Q components.