Patents Assigned to Nortel Networks Inc.
  • STRUCTURED LOW-DENSITY PARITY-CHECK (LDPC) CODE
    Publication number: 20110307755
    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=[Hd|Hp], Hd is the data portion, and Hp is 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.
    Type: Application
    Filed: June 9, 2011
    Publication date: December 15, 2011
    Applicants: NORTEL NETWORKS INC., NORTEL NETWORKS LIMITED
    Inventors: Michael LIVSHITZ, Aleksandar PURKOVIC, Nina BURNS, Sergey SUKHOBOK, Muhammad CHAUDHRY
  • Structured low-density parity-check (LDPC) code
    Patent number: 8024641
    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=[Hd|Hp], Hd is the data portion, and Hp is 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.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: September 20, 2011
    Assignees: Nortel Networks Limited, Nortel Networks Inc.
    Inventors: Michael Livshitz, Aleksandar Purkovic, Nina Burns, Sergey Sukhobok, Muhammad Chaudhry
  • Structured low-density parity-check (LDPC) code
    Patent number: 7996746
    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=[Hd|Hp], Hd is the data portion, and Hp is 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.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: August 9, 2011
    Assignees: Nortel Networks Limited, Nortel Networks Inc.
    Inventors: Michael Livshitz, Aleksandar Purkovic, Nina Burns, Sergey Sukhobok, Muhammad Chaudhry