MLC存储信道下的双层LDPC码优化设计  

Optimal Design of Bilayer LDPC Codes in MLC Storage Channel

作　　者：侯文涛 张顺外[1] 孔令军 HOU Wentao;ZHANG Shunwai;KONG Lingjun(College of Telecommunication and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;School of Networks and Telecommunications Engineering,Jinling Institute of Technology,Nanjing 211169,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]金陵科技学院网络与通信工程学院,江苏南京211169

出　　处：《无线电工程》2022年第1期93-100,共8页Radio Engineering

基　　金：中国博士后科学基金资助项目(2020M671595);江苏省博士后科研资助计划资助项目(2020Z198);江苏省大学生创新训练项目(202113573050Y);金陵科技学院高层次人才科研启动资金(jit-b-202110)。

摘　　要：大数据及云存储的发展对传统的存储技术提出了更高的要求。为了进一步提升多级存储单元的存储效率,提出了一种双层低密度奇偶校验(Low-Density Parity-Check, LDPC)码的优化设计方法。该方法针对多层单元(Multi-level Cell, MLC)信道的非对称性特性,对存储单元的单页添加额外校验比特以提高存储单元闪存信道的译码性能,并对单层LDPC码和本算法的性能进行了分析。仿真结果表明,在多级存储单元信道中使用BP译码算法进行译码,误码率为10;时,基于双层LDPC码构造的纠错码算法比单层LDPC码有约额外4 000次的擦除次数的提升,且译码复杂度也相应降低。The development of big data and cloud storage puts forward higher requirements for the traditional storage technology.In order to further improve the storage efficiency of multi-level storage units, an optimal design method of bilayer Low-Density Parity-Check(LDPC) codes is proposed.According to the asymmetric characteristics of Multi-level Cell(MLC) channel, this method adds additional check bits to the single page of storage unit to improve the decoding performance of flash memory channel of storage unit.The performance of single-layer LDPC code and the algorithm are analyzed.The simulation results show that when BP decoding algorithm is used for decoding in multi-level storage unit channel, when the bit error rate is 10;,the error correction code algorithm based on bilayer LDPC code has about 4 000 additional erasures compared with single-layer LDPC code, and the decoding complexity is reduced accordingly.

关 键 词：多层单元存储信道 低密度奇偶校验码优化 双层低密度奇偶校验码 BP译码算法 

分 类 号：TN911.22[电子电信—通信与信息系统]