不等差错保护的系统Raptor码  

Systematic raptor codes for unequal error protection

作　　者：石东新[1] 杨占昕[2] 

机构地区：[1]中国传媒大学理工学部,北京100024 [2]中国传媒大学数字化工程中心,北京100024

出　　处：《华中科技大学学报（自然科学版）》2016年第5期47-53,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家科技支撑计划课题资助项目(2014BAK10B01)

摘　　要：提出一种删除信道下不等差错保护(UEP)的系统Raptor码.该码采用简化的扩展窗喷泉码技术(EWF)对RFC 5053标准系统Raptor码的中间符号进行编码,得到的编码符号在具有UEP性能的同时仍能维持系统性.对提出的UEP系统Raptor码分别给出了分级的编码和解码算法,分级算法可以在很大程度上兼容并应用经过优化的标准Raptor码的现有编解码算法.试验结果表明:该UEP系统Raptor码具有良好的UEP性能.对实验数据的分析和理论推导得到该码的最佳编码参数取值方程,为该码在不同信道条件下的应用提供了参数选择的依据.An unequal error protection（UEP）systematic Raptor codes was developed over erasure channels.The proposed codes exploited Luby transform（LT）codes to intermediate symbols of RFC5053 standard Raptor codes with simplified expanding window fountain（EWF）technique directly,so that the UEP Raptor codes were obtained with systematic property simultaneously.The hierarchical encoding and decoding algorithms were deduced for the proposed codes with a great compatibility with the standard Raptor codes which could be highly optimized.The numerical results show that the proposed codes have great UEP property.Through the analysis of results and theoretical derivation,formula to find the best coding parameter was obtained,which provides the basis of parameter selection for the applications in the different channel conditions.

关 键 词：不等差错保护 RAPTOR码 LT码 扩展窗喷泉码 更重要比特 

分 类 号：TN911.22[电子电信—通信与信息系统]