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Low-Complexity Detection and Decoding Scheme for LDPC-Coded MLC NAND Flash Memory 被引量:1
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作者 Xusheng Lin Guojun Han +2 位作者 Shijie Ouyang Yanfu Li Yi Fang 《China Communications》 SCIE CSCD 2018年第6期58-67,共10页
With the development of manufacture technology, the multi-level cell(MLC)technique dramatically increases the storage density of NAND flash memory. As the result,cell-to-cell interference(CCI) becomes more serious and... With the development of manufacture technology, the multi-level cell(MLC)technique dramatically increases the storage density of NAND flash memory. As the result,cell-to-cell interference(CCI) becomes more serious and hence causes an increase in the raw bit error rate of data stored in the cells.Recently, low-density parity-check(LDPC)codes have appeared to be a promising solution to combat the interference of MLC NAND flash memory. However, the decoding complexity of the sum-product algorithm(SPA) is extremely high. In this paper, to improve the accuracy of the log likelihood ratio(LLR) information of each bit in each NAND flash memory cell, we adopt a non-uniform detection(N-UD) which uses the average maximum mutual information to determine the value of the soft-decision reference voltages.Furthermore, with an aim to reduce the decoding complexity and improve the decoding performance, we propose a modified soft reliabilitybased iterative majority-logic decoding(MSRBI-MLGD) algorithm, which uses a non-uniform quantizer based on power function to decode LDPC codes. Simulation results show that our design can offer a desirable trade-off between the performance and complexity for high-column-weight LDPC-coded MLC NAND flash memory. 展开更多
关键词 Cell-to-cell interference(CCI) LDPC codes MLC NAND flash memory non-uniform detection(N-UD) modified soft reliability-based iterative majority-logic decoding(MSRBI-MLGD) algorithm
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PERFORMANCE OF SIMPLE-ENCODING IRREGULAR LDPC CODES BASED ON SPARSE GENERATOR MATRIX
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作者 唐蕾 仰枫帆 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2006年第3期202-207,共6页
A new method for the construction of the high performance systematic irregular low-density paritycheck (LDPC) codes based on the sparse generator matrix (G-LDPC) is introduced. The code can greatly reduce the enco... A new method for the construction of the high performance systematic irregular low-density paritycheck (LDPC) codes based on the sparse generator matrix (G-LDPC) is introduced. The code can greatly reduce the encoding complexity while maintaining the same decoding complexity as traditional regular LDPC (H-LDPC) codes defined by the sparse parity check matrix. Simulation results show that the performance of the proposed irregular LDPC codes can offer significant gains over traditional LDPC codes in low SNRs with a few decoding iterations over an additive white Gaussian noise (AWGN) channel. 展开更多
关键词 belief propagation iterative decoding algorithm sparse parity-check matrix sparse generator matrix H LDPC codes G-LDPC codes
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