Patent ID: 6535560
Filing Date: 2003-03-18
Classification: H03D,H04L

Abstract:
A coherent adaptive calibration method for calibration of a receiver, comprising the steps of:summing a series of first channel signal samples with a first channel offset correction parameter to produce a corrected series of first channel samples; summing a series of second channel signal samples with a second channel offset correction parameter, multiplying by a gain imbalance correction parameter and summing a product of said corrected series of said first channel samples and a phase error correction parameter to create a corrected set of second channel samples, wherein said second channel is orthogonal to said first channel; multiplying said corrected series of first channel samples with a first sinusoidal waveform to determine a first product; multiplying said corrected set of second channel samples with a second sinusoidal waveform to determine a second product, said second sinusoidal waveform being 90 degrees out of phase with said first sinusoidal waveform; filtering said first product to determine a first channel gain imbalance measurement; filtering said second product to determine a second channel gain imbalance measurement; and determining a next value of said gain imbalance correction parameter based upon said first and second channel gain imbalance measurements.