METHOD AND SYSTEM FOR PROVIDING LONG AND SHORT BLOCK LENGTH LOW DENSITY PARITY CHECK (LDPC) CODE

摘要

PPROBLEM TO BE SOLVED: To provide an approach for generating Low Density Parity Check (LDPC) codes. PSOLUTION: An LDPC encoder (203) generates a LDPC code with an outer Bose Chaudhuri Hocqenghem (BCH) code. For 1/3 rate, the relevant parameters are as follows: q=120, nSBldpc/SB=64,800, kSBldpc/SB=nSBBCH/SB=21600, kSBBCH/SB=21408 (12 bit error correcting BCH). For 1/ 4 rate, the LDPC code has the following relevant parameters: q=135, nSBldpc/SB=64,800, kSBldpc/SB=nSBBCH/SB=16200, kSBBCH/SB=16008 (12 bit error correcting BCH). For 2/5 rate, the following parameters exist: q=108, nSBldpc/SB=64800, kSBldpc/SB=nSBBCH/SB=25920, kSBBCH/SB=25728 (12 bit error correcting BCH). This approach has particular application in digital video broadcast services over satellite. PCOPYRIGHT: (C)2005,JPO&NCIPI