Method and apparatus for DC offset correction

DETAILED DESCRIPTION What is claimed is: 1.
A method of correcting for DC offsets in a digital signal, comprising the steps of: receiving a digital signal (an I/Q signal); estimating the peaks of the digital signal using envelope estimation; averaging the peaks of the digital signal to estimate the DC offset; and correcting for the DC offset by summing the DC offset with the digital signal.
2.
The method of claim 1, wherein the envelope estimation is determined by performing the steps of: determining peak values in the digital signal; updating the peak values when the digital signal exceeds current peak values; adjusting the peak value resulting in an instantaneous positive peak or an instantaneous negative peak; and estimating the DC offset by averaging the instantaneous positive and negative peaks.
3.
The method of claim 2, wherein the step of adjusting comprises the step of increasing or decreasing the peak value by a predetermined step thereby providing a fixed envelope estimation scheme.
4.
The method of claim 2, wherein the step of adjusting comprises the step of increasing or decreasing the peak value by an adaptive step thereby providing an adaptive envelope estimation scheme.
5.
A method of correcting for DC offsets in a digital signal, comprising the steps of: receiving a digital signal (an I/Q signal); estimating the peaks of the digital signal using fixed block processing peak estimations; averaging the peaks of the digital signal to estimate the DC offset; and correcting for the DC offset by summing the DC offset with the digital signal.
6.
The method of claim 5, wherein the fixed block processing is performed by: performing order statistics filtering on the fixed window size to produce decimated signals; extracting local positive and negative peaks from the decimated signals; and estimating DC offsets by averaging the local positive and negative peaks.
7.
The method of claim 5, wherein the fixed block processing is performed by: performing order statistics filtering on the fixed window size to produce decimated signals; extracting local positive and negative peaks from the decimated signals; determining global positive and negative peaks using the local positive and negative peaks; estimating DC offsets by averaging the global positive and negative peaks