【摘要】：為了提高MLC NAND Flash的抗誤碼性能,該文提出一種基于優(yōu)化縮短極化碼的MLC NAND Flash差錯控制方法。優(yōu)化縮短極化碼通過優(yōu)化刪減圖樣得到,首先通過比特翻轉(zhuǎn)重排序的方式得到基本刪減圖樣,進而選擇具有更低信道容量的凍結(jié)比特組成優(yōu)化刪減圖樣,使得到的刪減比特全為凍結(jié)比特,可以顯著提高刪減算法的糾錯性能。同時,根據(jù)MLC單元錯誤的不對稱性,采用碼率自適應(yīng)的碼字對FLASH中MSB和LSB進行不等錯誤保護。仿真結(jié)果表明:當(dāng)誤幀率為310-時,優(yōu)化縮短極化碼較相同碼長的LDPC碼和基本縮短極化碼分別約有3.72~5.89 d B和1.47~3.49 d B增益;相比基于同一碼率的優(yōu)化縮短極化碼方案,不等錯誤保護的差錯控制方案獲得約0.25 d B增益。
[Abstract]:In order to improve the error-resistant performance of MLC NAND Flash, a MLC NAND Flash error control method based on optimized shortened polarization codes is proposed. The optimized shortened polarization code is obtained by optimizing the truncation pattern. Firstly, the basic deleted pattern is obtained by the way of bit reversal reordering, and then the frozen bit with lower channel capacity is selected to form the optimized deletion pattern. All the deleted bits are frozen bits, which can improve the error-correcting performance of the deletion algorithm. At the same time, according to the asymmetry of MLC unit error, the MSB and LSB in FLASH are protected by bit rate adaptive codeword. The simulation results show that when the frame error rate is 310-, the gain of the optimized shortened polarization code (LDPC code) and the basic shortened polarization code (BPC) are about 3.72kHz 5.89dB and 1.4710dB respectively. Compared with the optimized shortened polarization code scheme based on the same bit rate, the error control scheme with unequal error protection gains about 0.25 dB gain.
【作者單位】： 杭州電子科技大學(xué)通信工程學(xué)院;
【基金】：浙江省自然科學(xué)基金(LY16F010013) 浙江省重點科技創(chuàng)新團隊基金(2013TD03) 國家自然科學(xué)基金(61401130)~~
【分類號】：TN911.22

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