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:
Jul. 17, 2012
Filed:
May. 05, 2004
Jonathan James Ashley, Los Gatos, CA (US);
Keenan Terrell O'brien, Longmont, CO (US);
Richard Rauschmayer, Longmont, CO (US);
Sumeet Sanghvi, Santa Clara, CA (US);
Anne Q. YE, Sunnyvale, CA (US);
Kaichi Zhang, San Jose, CA (US);
Jonathan James Ashley, Los Gatos, CA (US);
Keenan Terrell O'Brien, Longmont, CO (US);
Richard Rauschmayer, Longmont, CO (US);
Sumeet Sanghvi, Santa Clara, CA (US);
Anne Q. Ye, Sunnyvale, CA (US);
Kaichi Zhang, San Jose, CA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A method and apparatus are provided for determining a plurality of filter tap weights or biases (or both) for a noise predictive filter used to generate one or more signal dependent branch metrics. A filter tap weight or filter bias (or both) are adaptively accumulated for each possible data condition. The data conditions may comprise, for example, each possible data pattern for a given data dependency length. The appropriate accumulated filter tap weight or bias to update can be selected based on a data condition associated with the current received data. The filter tap weights associated with a delay 0 tap can be adapted for each filter condition except for a single normalizing condition, whose corresponding delay 0 tap remains fixed.