首页> 外文会议>Defect and Fault Tolerance in VLSI Systems, 2009. DFT '09 >Error Control Coding for Multilevel Cell Flash Memories Using Nonbinary Low-Density Parity-Check Codes
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Error Control Coding for Multilevel Cell Flash Memories Using Nonbinary Low-Density Parity-Check Codes

机译:使用非二进制低密度奇偶校验码的多级单元闪存的错误控制编码

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Conventional flash memories generally utilize simple error control codes, such as Hamming code and BCH code. In future high-density multilevel cell (MLC) flash memories, however, it is estimated that raw bit error rate (BER) will soar with increasing number of charge levels, and hence the conventional error control coding will not be sufficient for these memories. Low-density parity-check (LDPC) code is a class of strong error control codes which are adopted in practical wired/wireless communication systems, and hence the LDPC code is an important candidate for error control code in future MLC memories. Application of the LDPC code to MLC memory is not so straightforward as conventional error control codes because the LDPC code usually employs soft-input decoding to achieve low decoded BER, and hence analysis of the error probability is crucial, especially when nonbinary codes are applied. Therefore, this paper analyzes error characteristics of MLC flash memory from error control coding viewpoint, and then proposes an error control coding using nonbinary LDPC codes. Evaluation shows that the decoded BER of the nonbinary LDPC code is lower than that of conventional binary irregular LDPC code, and also demonstrates that nonbinary LDPC code defined by a parity-check matrix having average column weight w = 2.5 has lower decoded BER than nonbinary LDPC codes with w = 2 and 3.
机译:常规的闪存通常利用简单的错误控制码,例如汉明码和BCH码。然而,在未来的高密度多级单元(MLC)闪存中,据估计原始位错误率(BER)将随着电荷水平数量的增加而飙升,因此常规的错误控制编码对于这些存储器是不够的。低密度奇偶校验(LDPC)码是在实际的有线/无线通信系统中采用的一类强错误控制码,因此LDPC码是将来的MLC存储器中错误控制码的重要候选者。将LDPC码应用于MLC存储器并不像传统的差错控制码那么简单,因为LDPC码通常采用软输入解码来实现低解码BER,因此对差错概率的分析至关重要,尤其是在应用非二进制码时。因此,本文从错误控制编码的角度分析了MLC闪存的错误特性,然后提出了使用非二进制LDPC码的错误控制编码。评估表明,非二进制LDPC码的解码后BER低于常规二进制不规则LDPC码,并且还证明了由平均列权重w = 2.5的奇偶校验矩阵定义的非二进制LDPC码的解码BER比非二进制LDPC低w = 2和3。

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