中文说明：该项目建设的QC LDPC码的长度短没有周长4和周长6该计划提出了构建LDPC码的短长度周长8的方法。首先，我们设计3子矩阵与我们的方案给予不同的换挡功能，然后将它们组合成一个矩阵，根据我们的方法，最后，扩大矩阵成所需的奇偶校验检查矩阵使用单位矩阵和单位矩阵的循环移位矩阵。模拟结果在AWGN信道中显示其可以通过来自于该校验矩阵用于编码随机的信息比特的生成矩阵来获得的代码为随机LDPC码的一样好
English Description：
The Program to construct a short length of QC LDPC codes without girth 4 and girth 6This program presents an approach for constructing the short length of LDPC codes with girth 8. First, we design 3 submatrices with different shifting functions given by our schemes, then combine them into a matrix according to our approach, finally, expand the matrix into a desired parity-check matrix using identity matrices and cyclic shift matrices of the identity matrices. The simulation results in AWGN channels show that the codes which can be obtained by the generator matrix derived from this check matrix for encoding the random information bits are as good as random LDPC codes