| 摘要 |
An approach is provided for generating Low Density Parity Check (LDPC) codes. An LDPC encoder generates a LDPC code with an outer Bose Chaudhuri Hocquenghem (BCH) code. For 1/3 rate, the relevant parameters are as follows: q=120, n<SUB>ldpc</SUB>=64,800, k<SUB>ldpc</SUB>=n<SUB>BCH</SUB>=21600, k<SUB>BCH</SUB>=21408 (12 bit error correcting BCH). For ¼ rate, the LDPC code has the following relevant parameters: q=135, n<SUB>ldpc</SUB>=64,800, k<SUB>ldpc</SUB>=n<SUB>BCH</SUB>=16200, k<SUB>BCH</SUB>=16008 (12 bit error correcting BCH). For 2/5 rate, the following parameters exist: q=108, n<SUB>ldpc</SUB>=64800, k<SUB>ldpc</SUB>=n<SUB>BCH</SUB>=25920, k<SUB>BCH</SUB>=25728 (12 bit error correcting BCH). The above approach has particular application in digital video broadcast services over satellite.
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