| 摘要 |
<p>According to an embodiment, in a parity check matrix creation method, all N column vectors in the mask matrix are different. A submatrix having M rows×L columns obtained by arbitrarily extracting L continuous columns from the mask matrix includes B1 first correction rows and Bi ith correction rows. The B1 first correction rows have at least one“1”in total in each of A1 first correction columns. Each of the Bi ith correction rows has at least one“1”in total in Ai-1 (i−1)th correction columns and has“1”in one of Ai ith correction columns included in a column set excluding the first correction columns to (i−1)th correction columns. The Bi ith correction rows include at least one“1”in total in each of the Ai ith correction columns. A sum from A1 to AI equals L.</p> |
