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:
Oct. 30, 2012
Filed:
Jun. 09, 2011
Michael Livshitz, Rockville, MD (US);
Aleksandar Purkovic, Potomac, MD (US);
Nina Burns, Columbia, MD (US);
Sergey Sukhobok, Rockville, MD (US);
Muhammad Chaudhry, Gaithersburg, MD (US);
Michael Livshitz, Rockville, MD (US);
Aleksandar Purkovic, Potomac, MD (US);
Nina Burns, Columbia, MD (US);
Sergey Sukhobok, Rockville, MD (US);
Muhammad Chaudhry, Gaithersburg, MD (US);
Research In Motion Limited, Waterloo, Ontario, CA;
Abstract
A method for constructing a low-density parity-check (LDPC) code using a structured base parity check matrix with permutation matrix, pseudo-permutation matrix, or zero matrix as constituent sub-matrices; and expanding the structured base parity check matrix into an expanded parity check matrix. A method for constructing a LDPC code using a structured base parity check matrix H=[H|H], His the data portion, and His the parity portion of the parity check matrix; the parity portion of the structured base parity check matrix is such so that when expanded, an inverse of the parity portion of the expanded parity check matrix is sparse; and expanding the structured base parity check matrix into an expanded parity check matrix. A method for encoding variable sized data by using the expanded LDPC code; and applying shortening, puncturing.