中文摘要：

结合杨辉三角的结构形式，基于大衍数列提出了一种列重为3或4的规则准循环低密度奇偶校验（QC-LDPC）码的新构造方法。该方法构造的校验矩阵围长至少为6，码长可灵活变化，并且可节省存储空间。仿真结果表明：在相同的仿真参数下，当误码率（BER）为10r6时，所构造的列重为3的QC—LDPC（1260，620）码的净编码增益（NCG）比二次函数码改善了1dB左右；列重为4的QC—LDPC（6056，3028）码相对于WMC-OCS、QC—OCS码分别有0．1dB和0．2dB的NCG提升。

英文摘要：

According to structure of Yanghui Triangle and based on the Dayan sequence, a novel construction method of regular quasi-cyclic low-density parity-check （QC-LDPC） codes whose column weight is 3 or 4 is put forward. Girth of parity-check matrix is at least 6. Length of the code can vary flexibly. And storage spaces can be saved. Under the same parameters, at the bit error rate（BER） of 10 -s, simulation results show QC-LDPC（ 1260, 620） code with column weight 3 has a net coding gain（NCG） nearly 1 dB more than quadratic function code and the NCG of QC-LDPC（6056, 3028） code with column weight 4 is 0.1 dB and 0.2 dB more than WMC-OCS and QC-OCS code respectively.