In order to fully utilize the soft decision ability of the outer decoder in a concatenated system, reliability information (called soft output) from the inner decoder or equalizer is required. In this paper, based on ...In order to fully utilize the soft decision ability of the outer decoder in a concatenated system, reliability information (called soft output) from the inner decoder or equalizer is required. In this paper, based on the analysis of typical implementations of soft output VA, a novel algorithm is proposed by utilizing the property of Viterbi algorithm. Compared with the typical implementations, less processing expense is required by the new algorithm for weighting the hard decisions of VA. Meanwhile, simulation results show that, deterioration in performance of this algorithm is usually small for decoding of convolutional code and negligible for equalization.展开更多
With the development of manufacture technology, the multi-level cell(MLC)technique dramatically increases the storage density of NAND flash memory. As the result,cell-to-cell interference(CCI) becomes more serious and...With the development of manufacture technology, the multi-level cell(MLC)technique dramatically increases the storage density of NAND flash memory. As the result,cell-to-cell interference(CCI) becomes more serious and hence causes an increase in the raw bit error rate of data stored in the cells.Recently, low-density parity-check(LDPC)codes have appeared to be a promising solution to combat the interference of MLC NAND flash memory. However, the decoding complexity of the sum-product algorithm(SPA) is extremely high. In this paper, to improve the accuracy of the log likelihood ratio(LLR) information of each bit in each NAND flash memory cell, we adopt a non-uniform detection(N-UD) which uses the average maximum mutual information to determine the value of the soft-decision reference voltages.Furthermore, with an aim to reduce the decoding complexity and improve the decoding performance, we propose a modified soft reliabilitybased iterative majority-logic decoding(MSRBI-MLGD) algorithm, which uses a non-uniform quantizer based on power function to decode LDPC codes. Simulation results show that our design can offer a desirable trade-off between the performance and complexity for high-column-weight LDPC-coded MLC NAND flash memory.展开更多
To improve error-correcting performance,an iterative concatenated soft decoding algorithm for Reed-Solomon(RS)codes is presented in this article.This algorithm brings both complexity as well as advantages in performan...To improve error-correcting performance,an iterative concatenated soft decoding algorithm for Reed-Solomon(RS)codes is presented in this article.This algorithm brings both complexity as well as advantages in performance over presently popular sot~decoding algorithms.The proposed algorithm consists of two powerful soft decoding techniques,adaptive belief propagation(ABP)and box and match algorithm(BMA),which are serially concatenated by the accumulated log-likelihood ratio(ALLR).Simulation results show that,compared with ABP and ABP-BMA algorithms,the proposed algorithm can bring more decoding gains and a better tradeoff between the decoding performance and complexity.展开更多
为提高水声通信系统的数据传输速率和可靠性,提出一种新的基于软信道估计的联合迭代均衡译码(joint iterative equalization and decoding,JIED)水声通信方法。该方法利用软输入软输出(soft in soft out,SISO)译码器反馈的外似然比计算...为提高水声通信系统的数据传输速率和可靠性,提出一种新的基于软信道估计的联合迭代均衡译码(joint iterative equalization and decoding,JIED)水声通信方法。该方法利用软输入软输出(soft in soft out,SISO)译码器反馈的外似然比计算符号软估计信息,并应用于稀疏自适应信道估计器的抽头系数更新过程。经过译码器和均衡器之间多次迭代交换软信息联合处理接收信号,信道估计精度与均衡效果显著提高。水声通信实验结果表明在通信距离1.8km、2kHz有效带宽内,新方法在第2次迭代后即可实现2kb/s的无误码传输,可以有效提高系统可靠性和传输速率。展开更多
摘要In order to fully utilize the soft decision ability of the outer decoder in a concatenated system, reliability information (called soft output) from the inner decoder or equalizer is required. In this paper, based on the analysis of typical implementations of soft output VA, a novel algorithm is proposed by utilizing the property of Viterbi algorithm. Compared with the typical implementations, less processing expense is required by the new algorithm for weighting the hard decisions of VA. Meanwhile, simulation results show that, deterioration in performance of this algorithm is usually small for decoding of convolutional code and negligible for equalization.
基金supported in part by the NSF of China (61471131, 61771149, 61501126)NSF of Guangdong Province 2016A030310337+1 种基金the open research fund of National Mobile Communications Research Laboratory, Southeast University (No. 2018D02)the Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2017-ZJ022)
摘要With the development of manufacture technology, the multi-level cell(MLC)technique dramatically increases the storage density of NAND flash memory. As the result,cell-to-cell interference(CCI) becomes more serious and hence causes an increase in the raw bit error rate of data stored in the cells.Recently, low-density parity-check(LDPC)codes have appeared to be a promising solution to combat the interference of MLC NAND flash memory. However, the decoding complexity of the sum-product algorithm(SPA) is extremely high. In this paper, to improve the accuracy of the log likelihood ratio(LLR) information of each bit in each NAND flash memory cell, we adopt a non-uniform detection(N-UD) which uses the average maximum mutual information to determine the value of the soft-decision reference voltages.Furthermore, with an aim to reduce the decoding complexity and improve the decoding performance, we propose a modified soft reliabilitybased iterative majority-logic decoding(MSRBI-MLGD) algorithm, which uses a non-uniform quantizer based on power function to decode LDPC codes. Simulation results show that our design can offer a desirable trade-off between the performance and complexity for high-column-weight LDPC-coded MLC NAND flash memory.
基金supported by the National Natural Science Foundation of China(60472104)
摘要To improve error-correcting performance,an iterative concatenated soft decoding algorithm for Reed-Solomon(RS)codes is presented in this article.This algorithm brings both complexity as well as advantages in performance over presently popular sot~decoding algorithms.The proposed algorithm consists of two powerful soft decoding techniques,adaptive belief propagation(ABP)and box and match algorithm(BMA),which are serially concatenated by the accumulated log-likelihood ratio(ALLR).Simulation results show that,compared with ABP and ABP-BMA algorithms,the proposed algorithm can bring more decoding gains and a better tradeoff between the decoding performance and complexity.
摘要为提高水声通信系统的数据传输速率和可靠性,提出一种新的基于软信道估计的联合迭代均衡译码(joint iterative equalization and decoding,JIED)水声通信方法。该方法利用软输入软输出(soft in soft out,SISO)译码器反馈的外似然比计算符号软估计信息,并应用于稀疏自适应信道估计器的抽头系数更新过程。经过译码器和均衡器之间多次迭代交换软信息联合处理接收信号,信道估计精度与均衡效果显著提高。水声通信实验结果表明在通信距离1.8km、2kHz有效带宽内,新方法在第2次迭代后即可实现2kb/s的无误码传输,可以有效提高系统可靠性和传输速率。