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:
Apr. 20, 2010
Filed:
Nov. 18, 2002
Bjorn A. Bjerke, Boston, MA (US);
John W. Ketchum, Harvard, MA (US);
Nagabhushana Sindhushayana, San Diego, CA (US);
Jay Rod Walton, Carlisle, MA (US);
Bjorn A. Bjerke, Boston, MA (US);
John W. Ketchum, Harvard, MA (US);
Nagabhushana Sindhushayana, San Diego, CA (US);
Jay Rod Walton, Carlisle, MA (US);
Qualcomm Incorporated, San Diego, CA (US);
Abstract
Method and apparatus for generating codewords with variable length and redundancy from a single Low-Density Parity-Check (LDPC) code with variable length input words. A mother code for encoding data words is generated based on a parity-check matrix, wherein the mother code is adjusted to reflect the size of the data word to be encoded. A generator matrix applies the mother code to data words to produce codewords for transmission. In one embodiment, a reduction criteria is determined and the size of the generator matrix reduced in response. The corresponding parity-check matrix is applied at the receiver for decoding the received codeword.