基于喷泉码的不等差错保护技术实现-《计算机技术与发展》

文章信息/Info

Title:: Implementation of Fountain Codes with Unequal Error Protection Property

Author(s):: WEN Ming-cai; LIU Feng; Jiangsu Province Key Lab.of Image Processing and Image Communication,Nanjing University of Posts and Telecommunications

摘要:: 在多媒体传输中,由于数据的重要性程度不同,需要一种不等差错保护策略,根据数据重要性给予不同程度的保护。提出了一种具有不等差错保护能力的喷泉码UEP-LT,通过改变LT码编码过程中每个编码符号的输入符号集的大小,使得度数比较低的编码符号以更高的概率选择高优先级数据,这样高优先级数据可以在R ipple消失前尽可能快地恢复出来。仿真结果表明,UEP-LT可以改善高优先级数据的译码成功率,同时提高了重建多媒体的质量,提高了网络传输的性能

Abstract:: In multimedia transmission,because of the importance of different levels of data,an unequal error protection scheme is needed,which assign a different degree of protection on the basis of the importance of the data.Proposes a fountain codes with unequal error protection property ：UEP-LT,which changes the size of input symbol sets of each encoding symbol in the normal LT coding process,and makes encoding symbols which have relatively low degrees with higher probability of selection of high priority data,such the high-priority data can be recovered as soon as possible before any disappearance of the ripple.Simulation results show that UEP-LT can not only improve the decoding success rate of the high-priority data,while improving the quality of the reconstructed multi-media to improve network transmission performance