摘要
LDPC码置信传播译码算法中,由于环路的存在,影响迭代译码的性能和迭代译码的收敛性。为减小这一影响,在迭代译码算法中引入加权因子,采用迭代加权的译码方法。该算法可使迭代信息趋于平稳,增加译码可信度,减少迭代次数,加快迭代译码的收敛,从而改善译码性能的方法。仿真结果表明,这种方法对最小环长小且环长分布较均匀的中短码长的码子性能影响较大。
The performance of LDPC codes with BP algorithm largely depends on cycles of short lengths in its Tanner graph. A weighted factor β was introduced into the BP algorithm in order to restrain the interlacing changes of the information for iteration, and enhance the reliability of decoding. With the proposed modified algorithm, improved performance can be achieved. Several kinds of LDPC codes were simulated and the results were analyzed.
出处
《解放军理工大学学报（自然科学版）》
EI
2005年第6期517-520,共4页
Journal of PLA University of Science and Technology(Natural Science Edition)
基金
国家863计划资助项目(2003AA123310)
关键词
低密度校验码
置信算法
环路
加权因子
迭代加权
LDPC（low density parity check） code
BP algorithm
girth of graph
weighted factor
iterate
