说明：  针对目前应用比较广泛的基于准循环矩阵构造的QC-LDPC(准循环LDPC)码的各种构造方法,分析比较了随机构造LDPC和各种准循环LDPC编码方法的优缺点,通过理论分析和MATLAB中的性能仿真,提出的相应的优化方案
(Broader view of the present application of quasi-circulant matrices based QC-LDPC (quasi-cyclic LDPC) codes for the various construction methods, structural analysis and comparison of the random LDPC and various quasi-cyclic LDPC coding advantages and disadvantages, through theoretical analysis and MATLAB The performance simulation, optimization scheme proposed by the corresponding)