METHOD AND SYSTEM FOR PROVIDING REDUCED MEMORY LOW DENSITY PARITY CHECK (LDPC) CODES

摘要

An approach is provided for generating Low Density Parity Check (LDPC) code s. An LDPC encoder (203) generates a LDPC code with an outer Bose Chaudhur i Hocquenghem (BCH) code. For a rate 3/5 code, the approach provides a degree profile that yields reduced memory requirements for storage of the edge values without significantly affecting the performance with respect to an "unmodified" rate 3/5 code. The relevant parameters for the reduced memory LDPC codes are as follows: q = 72, n ldpc = 64800, k ldpc = n BCH = 38880, k BCH = 38688. The above approach has particular application in digital video broadcast services over satellite.