本文介绍了一个循环差集的存在性定理。
A new existence theorem on cyclic difference sets is introduced in this note.
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.
研究了密码中的拟完美序列和完美序列与循环差集的关系，用群表示论证明了三族循环差集的存在；进而构造出相应的拟完美序列。
The conception "almost perfect arrays" is proposed and it is shown that the existence of an almost perfect binary array is equivalent to the existence of a certain divisible difference set.
研究了密码中的拟完美序列和完美序列与循环差集的关系，用群表示论证明了三族循环差集的存在；进而构造出相应的拟完美序列。
The conception "almost perfect arrays" is proposed and it is shown that the existence of an almost perfect binary array is equivalent to the existence of a certain divisible difference set.
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