In this paper,an efficient unequal error protection(UEP)scheme for online fountain codes is proposed.In the buildup phase,the traversing-selection strategy is proposed to select the most important symbols(MIS).Then,in...In this paper,an efficient unequal error protection(UEP)scheme for online fountain codes is proposed.In the buildup phase,the traversing-selection strategy is proposed to select the most important symbols(MIS).Then,in the completion phase,the weighted-selection strategy is applied to provide low overhead.The performance of the proposed scheme is analyzed and compared with the existing UEP online fountain scheme.Simulation results show that in terms of MIS and the least important symbols(LIS),when the bit error ratio is 10-4,the proposed scheme can achieve 85%and 31.58%overhead reduction,respectively.展开更多
为了提高MLC NAND Flash的抗误码性能,该文提出一种基于优化缩短极化码的MLC NAND Flash差错控制方法。优化缩短极化码通过优化删减图样得到,首先通过比特翻转重排序的方式得到基本删减图样,进而选择具有更低信道容量的冻结比特组成优...为了提高MLC NAND Flash的抗误码性能,该文提出一种基于优化缩短极化码的MLC NAND Flash差错控制方法。优化缩短极化码通过优化删减图样得到,首先通过比特翻转重排序的方式得到基本删减图样,进而选择具有更低信道容量的冻结比特组成优化删减图样,使得到的删减比特全为冻结比特,可以显著提高删减算法的纠错性能。同时,根据MLC单元错误的不对称性,采用码率自适应的码字对FLASH中MSB和LSB进行不等错误保护。仿真结果表明:当误帧率为310-时,优化缩短极化码较相同码长的LDPC码和基本缩短极化码分别约有3.72~5.89 d B和1.47~3.49 d B增益;相比基于同一码率的优化缩短极化码方案,不等错误保护的差错控制方案获得约0.25 d B增益。展开更多
基金supported by the National Natural Science Foundation of China(61601147)the Beijing Natural Science Foundation(L182032)。
文摘In this paper,an efficient unequal error protection(UEP)scheme for online fountain codes is proposed.In the buildup phase,the traversing-selection strategy is proposed to select the most important symbols(MIS).Then,in the completion phase,the weighted-selection strategy is applied to provide low overhead.The performance of the proposed scheme is analyzed and compared with the existing UEP online fountain scheme.Simulation results show that in terms of MIS and the least important symbols(LIS),when the bit error ratio is 10-4,the proposed scheme can achieve 85%and 31.58%overhead reduction,respectively.
文摘为了提高MLC NAND Flash的抗误码性能,该文提出一种基于优化缩短极化码的MLC NAND Flash差错控制方法。优化缩短极化码通过优化删减图样得到,首先通过比特翻转重排序的方式得到基本删减图样,进而选择具有更低信道容量的冻结比特组成优化删减图样,使得到的删减比特全为冻结比特,可以显著提高删减算法的纠错性能。同时,根据MLC单元错误的不对称性,采用码率自适应的码字对FLASH中MSB和LSB进行不等错误保护。仿真结果表明:当误帧率为310-时,优化缩短极化码较相同码长的LDPC码和基本缩短极化码分别约有3.72~5.89 d B和1.47~3.49 d B增益;相比基于同一码率的优化缩短极化码方案,不等错误保护的差错控制方案获得约0.25 d B增益。
