摘要： 高性能准循环低密度奇偶校验码构造的1/2码率的码的度分布存在一定局限性。针对该问题，重新布置校验矩阵中单位循环移位矩阵的分布，改进构造校验矩阵的方法。仿真结果表明，改进方法具有有效的编码算法，使度分布能满足1/2码率的最佳度分布，且能在同等码长的情况下得到更优的性能。

关键词: 编码, 低密度奇偶校验码, 准循环

Abstract: Aiming at the problem quasi-cyclic Low-Density Parity-Check(LDPC) code has an efficient encoding algorithm, the degree distribution of the code usually can not satisfy the optimal degree distribution. This paper disposes the distribution of unit cyclic shift matrix in check matrix, improves the method for constructing check matrix. Simulation results show that improved construction method has efficient encoding algorithm, makes the code with approximate optimal degree distribution, and the code has better performance under the condition of the same code length.

Key words: encoding, Low-Density Parity-Check(LDPC) code, quasi-cyclic

中图分类号: 

• TP393