采用置换矩阵，验证了契约关系模型理论构建与现实运作间的关联关系及系统的同构性。
Applying permutation matrix, the association and the system isomorphism between contractual relationship modeling in theory and its operation in practice were verified.
在迭代算法中，采用直接数据置换降低矩阵维数，节省了存储空间，提高了运算速度。
The iterative algorithms in C language were given, which used direct data replacement to reduce the dimension of matrix and saved the storage space.
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.
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