A raw bit error rate-aware decoding soft-decision delay reduction method

Abstract

The invention discloses a decoding soft decision delay reduction method for sensing an original bit error rate. In order to ensure data storage reliability, the LDPC adopts a soft decision decoding algorithm based on log-likelihood ratio information, and has strong decoding error correction capability. However, in the decoding judgment process, the bit information is frequently judged, and high judgment delay is caused. The method comprises the following steps: firstly, acquiring change information of an original bit error rate according to a current LDPC decoding result; and according to thechange information of the bit error rate, directly iteratively updating the log-likelihood ratio information of the bit to a target value in the next decoding judgment process, and then executing judgment operation, so as to reduce the redundant judgment times and further reduce the soft-decision decoding judgment delay.

Description

technical field [0001] The invention belongs to the technical field of solid-state disk storage, and more particularly, relates to a method for reducing the delay of decoding soft-decision based on the perception of the original bit error rate. Background technique [0002] At present, 3-dimentional (3D) stacked flash memory is widely used in computer and other systems as a large-capacity storage device because of its high unit storage density and large storage capacity due to its layered storage structure and multiple bits per unit. equipment. [0003] While 3D stacked flash memory brings large storage capacity, the reliability of data storage is threatened. Due to the influence of inter-layer interference, programmable erase and write cycles and storage cycles, the original bit error rate gradually increases, which seriously affects the reliability of data storage. . In order to ensure the reliability of data storage, Low Density Parity Check (LDPC) uses a soft-decision ...

AI Technical Summary

Problems solved by technology

Then, according to the change information of the bit error rate, in the next decoding decision process, the log likelihood ratio information of the bit is directly iteratively updated to the target value before performing the decision operation, so as to reduce the number of redundant decisions and further reduce the soft decision Decoding and decision delay, which can solve the technical problem of high decoding and decision delay caused by the existing LDPC soft decision decoding error correction method

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