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.
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。
The Q-matrix LDPC code has high flexibility concerning design of code length and rate, which makes it compatible with the existed standard.
矩阵LDPC码不同于现有其它结构LDPC码的独特之处在于，对码长和码率参数的设计具有高度灵活性，使其能与现有标准兼容。
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