Polar code error correction scheme applied to NAND flash memory
A polar code and scheme technology, applied in the field of channel coding, can solve the problems of weak error correction ability and long decoding delay, and achieve the effect of extending the service life and improving the decoding speed.
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[0022] The present invention will be further described below in conjunction with the accompanying drawings.
[0023] The present invention comprises steps:
[0024] 1) User data storage phase preprocessing
[0025] The data of different users in different operating systems will be converted into binary digital information in different formats in their file systems before final storage. In order to ensure that the stored information can be completely restored, we add redundant information to it to resist interference. Therefore, the binary bits output by the file system will first be converted into corresponding codewords through a polar code encoder (Polar Encoder) after being segmented.
[0026] For 2-bit / cell MLC flash memory, the bit stream c will be mapped to the corresponding target voltage by two bits (see image 3 ). The specific mapping method adopts Gray code (Gray Code), and the Hamming distance (Hamming Distance) between adjacent code words is 1; and voltage jud...
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