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:
Mar. 13, 2007
Filed:
Jul. 20, 2006
Jonathan J. Ashley, Los Gatos, CA (US);
Heinrich J. Stockmanns, Santa Cruz, CA (US);
Jonathan J. Ashley, Los Gatos, CA (US);
Heinrich J. Stockmanns, Santa Cruz, CA (US);
Infineon Technologies, AG, Munich, DE;
Abstract
Disclosed herein is an apparatus and method of calibrating the parameters of a Viterbi detectorin which each branch metric is calculated based on noise statistics that depend on the signal hypothesis corresponding to the branch. An offline algorithm for calculating the parameters of data-dependent noise predictive filtersA-D is presented which has two phases: a noise statistics estimation or training phase, and a filter calculation phase. During the training phase, products of pairs of noise samples are accumulated in order to estimate the noise correlations. Further, the results of the training phase are used to estimate how wide (in bits) the noise correlation accumulation registers need to be. The taps [t, t, t] of each FIR filter are calculated based on estimates of the entries of a 3-by-3 conditional noise correlation matrix Cdefined by C=E(nn|NRZ condition k).