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. 16, 2013
Filed:
Jul. 01, 2008
John Dielissen, Nederweert, NL;
John Dielissen, Nederweert, NL;
ST-Ericsson SA, Plan-les-Ouates, CH;
Abstract
An LDPC decoder iteratively decodes an LDPC code represented by a parity check matrix H consisting of a plurality of circulants based on a Log-Likelihood Ratio Belief-Propagation algorithm. First computation means () compute for a next iteration symbol messages λfrom a representation of a corresponding symbol value stored in a first memoryand from check node messages Λfrom a previous iteration. A shuffler () changes a sequence of the symbol message received from the first computation means () in dependence on a position of the non-zero elements in a corresponding sub-matrix. Second computation means (DP-O, DP-I, DP-D-I) compute the check node messages in dependence on symbol messages received from the barrel shifter and store a representation of the computed check node message in a second memory (). Third computation means () update the representation of the symbol values in the first memory in dependence on output of the first and second computing means. The principle of 'staggered' or 'shuffled' LDPC decoding is used. One embodiment is designed for multi-diagonal circulants.