对准循环Q矩阵和完全循环差集进行了研究，在此基础上提出了一种LDPC码码族的代数构造方法。
This paper presents an algebra method for constructing LDPC code based on Vandermonde matrix, which includes quasi-cyclic Q matrix and the perfect cyclic difference sets.
压缩时，先对测试向量集进行差分运算，然后采用CPRL码编码差分向量序列。
During compression, it generates difference vectors from test data and then encoding the vectors with CPRL codes.
压缩时，先对测试向量集进行差分运算，然后采用CPRL码编码差分向量序列。
During compression, it generates difference vectors from test data and then encoding the vectors with CPRL codes.
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