High rate non-systematic LDPC codes for nonuniform sources Conference Paper uri icon


  • Non-systematic channel encoding is superior to systematic encoding in the presence of source redundancy. We show analytically that for high rate codes the advantage of non-systematic encoding over systematic encoding becomes even more significant. We then consider classes of non-systematic low-density parity-check (LDPC) codes based on scrambling or splitting redundant data bits into coded bits. Scrambling and splitting are achieved by cascading a sparse matrix or an inverse of a sparse matrix, respectively, with an LDPC code. Such codes exhibit excellent performance in the presence of source redundancy, which is far superior to that of systematic LDPC codes. The advantage of such codes is even more significant for high rate coding. Simulation results demonstrate this advantage.

published proceedings

  • Turbo Codes and Related Topics; 6th International ITG-Conference on Source and Channel Coding (TURBOCODING), 2006 4th International Symposium on

author list (cited authors)

  • Shamir, G. I., Wang, L., & Boutros, J. J.

complete list of authors

  • Shamir, GI||Wang, L||Boutros, JJ

publication date

  • January 2006