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:
Jan. 04, 2011
Filed:
Aug. 26, 2009
Jonathan James Ashley, Los Gatos, CA (US);
Kelly Knudson Fitzpatrick, Sudbury, MA (US);
Erich Franz Haratsch, Bethlehem, PA (US);
Jonathan James Ashley, Los Gatos, CA (US);
Kelly Knudson Fitzpatrick, Sudbury, MA (US);
Erich Franz Haratsch, Bethlehem, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A path metric difference computation unit is disclosed for computing path differences through a multiple-step trellis. Path differences are computed between paths through a multiple-step trellis, wherein a first path is a winning path for each single-step-trellis period of a multiple-step-trellis cycle, a second path is a winning path for a first single-step-trellis period and is a losing path for a second single-step-trellis period and a third path is a losing path for a first single-step-trellis period and is a winning path for a second single-step-trellis period. The disclosed path metric difference computation unit comprises path metric difference generators for generating a path metric difference Δfor a second single-step-trellis period based on a difference between the first path and the second path, and a path metric difference Δfor a first single-step-trellis period based on a difference between the first path and the third path, wherein intermediate path metric values or intermediate path metric difference values are reused to generate the path metric differences Δor Δ.