Enhanced Precision Through Multiple Reads for LDPC Decoding in Flash Memories
Jiadong Wang, Kasra Vakilinia, Tsung-Yi Chen, Thomas Courtade,, Guiqiang Dong, Tong Zhang, Hari Shankar, and Richard Wesel

TL;DR
This paper demonstrates that multiple reads with optimized voltages significantly improve LDPC decoding in Flash memories, approaching full-precision performance and outperforming BCH codes, with insights into code design trade-offs and optimization strategies.
Contribution
It introduces a method to optimize word-line voltages for LDPC decoding in Flash, maximizing mutual information and analyzing the impact of quantization on error rates and code performance.
Findings
Optimized multiple reads improve FER performance.
Mutual information maximization aligns with minimal frame error rate.
Trade-offs exist in code design for different precision levels.
Abstract
Multiple reads of the same Flash memory cell with distinct word-line voltages provide enhanced precision for LDPC decoding. In this paper, the word-line voltages are optimized by maximizing the mutual information (MI) of the quantized channel. The enhanced precision from a few additional reads allows FER performance to approach that of full-precision soft information and enables an LDPC code to significantly outperform a BCH code. A constant-ratio constraint provides a significant simplification in the optimization with no noticeable loss in performance. For a well-designed LDPC code, the quantization that maximizes the mutual information also minimizes the frame error rate in our simulations. However, for an example LDPC code with a high error floor caused by small absorbing sets, the MMI quantization does not provide the lowest frame error rate. The best quantization in this case…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsError Correcting Code Techniques · Advanced Data Storage Technologies · Caching and Content Delivery
