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... by its parity-check matrix H, which is sparse, that is, it consists mainly of 0's and a small number of 1's [6]. In particular, an LDPC code is denoted (n, t c , t r ), where n denotes the block length, t c denotes column weight of matrix H, and t r denotes row weight of each row with t r > t c . The rate of such code is (1 − t c /t r ). Fig. 1 shows an example parity-check matrix of a (10, 3, 5) LDPC code and the corresponding bipartite graph with variable nodes and check nodes representing, respectively, columns and rows of the parity-check matrix ...
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