... 差分逼近 difference approach 差分代数 difference algebra 差分度量 measure of difference ...
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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。
In this paper, author defines algebra operation for linear time-variable systems note: ? There are many difference between this methods and matrix for time-variable systems.
本文对时变线性系统定义了代数运算(？)。它与时变线性系统的矩阵方法有许多不同之处。
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