Patent ID: 7706475
Filing Date: 2010-04-27
Classification: H04L

Abstract:
1. A communication system, comprising: a detector comprising an “I” oscillator and a “Q” oscillator that have the same frequency and that have at least one of an amplitude mismatch and a phase mismatch, wherein the detector provides a sequence of “I” samples and a sequence of “Q” samples based on the at least one of the amplitude mismatch and the phase mismatch; a compensation circuit that is responsive to the detector and to a calibration circuit, wherein the compensation circuit provides a sequence of compensated “I” samples based on the sequence of “I” samples and provides a sequence of a compensated “Q” samples based on the sequence of “Q” samples, wherein the calibration circuit provides at least one of an estimated amplitude mismatch and an estimated phase mismatch based on at least one of: a cross-correlation between the sequence of compensated “I” samples and the sequence of compensated “Q” samples, and a power level difference between the sequence of compensated “I” samples and the sequence of compensated “Q” samples, wherein the compensation circuit provides at least one of the sequence of compensated “I” samples and the sequence of compensated “Q” samples based on at least one of the estimated amplitude mismatch and the estimated phase mismatch, wherein the calibration circuit provides the at least one of the estimated amplitude mismatch and the estimated phase mismatch iteratively, and wherein the calibration circuit provides the estimated amplitude mismatch based on: wherein: is the estimated amplitude mismatch for the current iteration, is the estimated amplitude mismatch for the prior iteration,