To enhance encoding efficiency, an unequal error protection （UEP） broadcast scheme based on one additional feedback is proposed. Different from the equal probability selection for source packets in traditional fount...To enhance encoding efficiency, an unequal error protection （UEP） broadcast scheme based on one additional feedback is proposed. Different from the equal probability selection for source packets in traditional fountain encoding, the proposed scheme calculates the packet loss ratio （PLR） according to the feedback results in systematic broadcast phase （SBP） and then optimizes the selection probability for source packets to guarantee higher level error protection for those source packets with larger PLRs. Thus the amount of unnecessarily redundant encoded packets during encoding broadcast phase （EBP） is decreased significantly. Numerical results show that the proposed scheme can recover 60% more packets than the traditional non-feedback broadcast scheme at the ex- pense of tolerably only one feedback procedure.展开更多
The unequal error protection （UEP） is applied in distributed speech recognition （DSR） system and three schemes are proposed. All of these three schemes are evaluated on the GSM simulating platform for recognizing ...The unequal error protection （UEP） is applied in distributed speech recognition （DSR） system and three schemes are proposed. All of these three schemes are evaluated on the GSM simulating platform for recognizing mandarin digit strings and compared with the equal error protection （EEP） scheme. Experiments show that UEP can protect the data transmitted in DSR system more effectively, which results in a higher word accurate rate of DSR system.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 China National S&T Major Project(2013ZX03003002003)the National Natural Science Foundation of China(61371075)"111"Project of China(B14010)
文摘To enhance encoding efficiency, an unequal error protection （UEP） broadcast scheme based on one additional feedback is proposed. Different from the equal probability selection for source packets in traditional fountain encoding, the proposed scheme calculates the packet loss ratio （PLR） according to the feedback results in systematic broadcast phase （SBP） and then optimizes the selection probability for source packets to guarantee higher level error protection for those source packets with larger PLRs. Thus the amount of unnecessarily redundant encoded packets during encoding broadcast phase （EBP） is decreased significantly. Numerical results show that the proposed scheme can recover 60% more packets than the traditional non-feedback broadcast scheme at the ex- pense of tolerably only one feedback procedure.
基金Sponsored bythe National Natural Science Foundation of China (60372089) the Basic Research Foundation of Beijing Institute of Technology(BIT-UBF-200301F03)
文摘The unequal error protection （UEP） is applied in distributed speech recognition （DSR） system and three schemes are proposed. All of these three schemes are evaluated on the GSM simulating platform for recognizing mandarin digit strings and compared with the equal error protection （EEP） scheme. Experiments show that UEP can protect the data transmitted in DSR system more effectively, which results in a higher word accurate rate of DSR system.
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。
