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. 27, 2010
Filed:
May. 08, 2007
Mark Edward Rollins, Stittsville, CA;
John Duncan Mcnicol, Ottawa, CA;
Mark Edward Rollins, Stittsville, CA;
John Duncan McNicol, Ottawa, CA;
Applied Micro Circuits Corporation, San Diego, CA (US);
Abstract
Conventional adaptive equalizers often use the 'sign/sign' algorithm as a low complexity means to adjust their tap weight coefficients by driving the correlation between its single-bit 'error' and “data” signals to zero. This algorithm fails in the presence of strong residual intersymbol interference (ISI), since this ISI renders the “error” signal sufficiently inaccurate to mask the correlation between “data” and “error”. Failure manifests itself two-fold as an inability to achieve tap weight acquisition at startup, and an inability to track dynamic channel conditions. The invention described herein employs an adaptive estimator to compute the residual masking ISI terms that in turn control an adaptive error slicer to synthesize a modified single-bit “error” signal that remains correlated with the “data” signal. By restoring this correlation between “error” and “data” using these two modifications, the “sign/sign” algorithm retains its acquisition and tracking capabilities in the presence of strong residual ISI.