| 摘要 |
A set of irregular LDPC codes (figure 6) having a pseudo-random structure and low encoding complexity. A block-cyclic LDPC code (9a, 9b, 9c) has an irregular row or an irregular column weight and includes a parity check matrix and an encoding matrix each of which has a pseudarandom structure. This allows the code (9a, 9b, 9c) to have the irregular row weight or irregular column weight together with an overall randomness to the code structure. Blocks within the code (9a, 9b, 9c) can be shortened, adjacent blocks of code (9a, 9b, 9c) can be overlapped, and adjacent columns within a block ca be arbitrarily permuted so to change the weighting of rows and columns. The LDPC codes (9a, 9b, 9c) are particularly useful in two-way communications system for an electrical distribution system (1) to restore data lost or corrupted during its transmission.
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