A Joint Decoding Strategy of Non-Binary LDPC Codes Based on Retention Error Characteristics for MLC NAND Flash Memories
A joint decoding strategy is proposed to reduce the time consumption of non-binary LDPC (NB-LDPC) decoding process.This strategy is based on the retention error characteristics of Multi-Level Cell (MLC) NAND flash memories.The raw bit error rate is estimated by an empirical formula of retention error increasing model.With the bit flip patterns caused by retention errors in a MLC NAND flash cell,the bit-granularity bit error rate (soft information) can be calculated according to the raw bit error rate (RBER).Then,the soft information is used as an input of the NB-LDPC decoder to accelerate the convergence of decoding process.The experimental results show that the proposed joint decoding strategy can reduce an average 20.5% of the time consumption of NB-LDPC decoding process (the maximum reduction reaches 65.1%).In addition,the error correction capability is almost doubled,while experiencing only little overhead.
NB-LDPC NAND flash memory retention error soft information
Liyan Qiao Hefeng Wu Debao Wei Shiyuan Wang
Department of Automatic Test and Control, Harbin Institute of Technology, Harbin, China
国际会议
哈尔滨
英文
183-188
2016-07-21（万方平台首次上网日期，不代表论文的发表时间）