该方法利用一个短的LDPC码的校验矩阵作为其母矩阵，在此基础上采用循环置换矩阵构造一个长的LDPC码。
The method used a parity-check matrix of a short LDPC code as its mother matrix upon which a long code was constructed with circulant permutation matrices.
在用循环置换矩阵构造准循环LDPC码时会出现一类无法消除的环，称为平衡环。
QC-LDPC codes constructed by circulant permutation matrices will lead to inevitable cycles, named balanced-cycles.
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