【作者】 马凌宇； 许成谦； 吕侠；

【Author】 Ma Lingyu Xu Chengqian Lv Xia (Department of Infomation Science& Engineering, Yanshan University 066004)

【机构】 燕山大学信息科学与工程学院；

【摘要】 本文提出了一种基于均衡不完全分组设计(BIBD)构造的低密度奇偶校验(LDPC)码的改进算法。该方法通过对校验矩阵中构成短环的关键节点进行替换,达到减少短环的目的,因而提高了LDPC码的围长,弥补了多数代数方法构造的准循环LDPC码,只能去除长度为4的环的不足。实验结果表明,该方法能有效降低该类LDPC码的误码率,并且不改变码的准循环(QC)特性,因此仍然易于硬件实现。更多还原

【Abstract】 A method is introduced to improve the girth of quasi-cyclic low-density parity-check code based on BIBD. The method replaces the key nodes of short cycles in the check matrix, so it can reduce the numbers of short cycles. Most of QC-LDPC codes constructed by algebraic methods can only get rid of cycles whose lengths are 4, this method can make up it. The method can improve the performance of bit-error-rate effectively, from the experiment result, and it doesn’t change the quasi-cyclic character of the codes, hence it is friendly for hardware.更多还原