The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 05, 2011
Filed:
Sep. 25, 2008
James M. Little, Sacramento, CA (US);
Marwan Hassoun, Austin, TX (US);
David Tetzlaff, Minnetonka, MN (US);
Chang-chi Liu, Fremont, CA (US);
James M. Little, Sacramento, CA (US);
Marwan Hassoun, Austin, TX (US);
David Tetzlaff, Minnetonka, MN (US);
Chang-Chi Liu, Fremont, CA (US);
Vintomie Networks B.V., LLC, Dover, DE (US);
Abstract
Combined echo and crosstalk cancellation is provided. Frequency domain adaptive filters are used to remove or reduce the effects of echo and crosstalk for a multi-channel and full-duplex communications system. Data from each transmit channel is buffered and converted to the frequency domain. The frequency domain data is multiplied by crosstalk coefficients to obtain a frequency domain correction signal for each channel. Adaptation of the crosstalk coefficients is based on correlations between the error signals and the data from each of the transmit channels. A single frequency domain transform engine, such as a Fast Fourier Transform engine, is employed for all calculations to save power and area.