soft-decision-decoding · shipping · also soft decoding

Soft-decision decoding

Soft-decision decoding uses reliability information about observed symbols rather than only their hard symbol decisions.

For NAND, comparisons at several reference voltages can supply that information; simply repeating an identical decision does not define soft decoding.

Relations

related

ldpc, log-likelihood-ratio, read-retry, nand-flash

Limitations

• Additional sensing, transfers and decoding can add latency; the precise recovery sequence is implementation-dependent. [2]

Citations

1. Wang, Courtade, Shankar and Wesel. Soft Information for LDPC Decoding in Flash: Mutual-Information Optimized Quantization. IEEE GLOBECOM 2011, sections II-IV. (accessed 2026-10-11)
2. Zhao, Dong, Sun, Zheng and Zhang. Reducing latency overhead caused by using LDPC codes in NAND flash memory. EURASIP JASP 2012:203. DOI: 10.1186/1687-6180-2012-203. (accessed 2026-10-11)
3. Hesela: LDPC in NAND, the read cost of confidence (accessed 2026-10-11)

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