不同权重优先级不等差错保护LT码的设计  

Design of UEP-LT codes with different weight prioritys

作　　者：王孝欣 高守玮[1] 袁舰 李俊[2] 

机构地区：[1]上海大学机电工程与自动化学院,上海200072 [2]新南威尔士大学电子工程与通信学院

出　　处：《电子测量技术》2015年第8期1-4,共4页Electronic Measurement Technology

摘　　要：通过分析当前LT码在实践中的应用,根据传输数据具有不同优先级的特点,针对等差错保护LT(EEP-LT)码在这方面的性能缺陷,提出了不同权重优先级不等差保护特性LT(UEP-LT)码的设计。该设计按传输数据的优先级提供对数据层不同的保护水平。根据传输标准图像时的译码开销以及误码率判断性能,仿真结果显示,提出的UEP-LT码能以极低的译码开销恢复大多数高优先级的数据,在合理的译码开销下具有比等差保护(EEP)低的误码率。同时,抛物线形优先级的UEP-LT码比线性优先级的UEP-LT码在译码开销和误码率方面具有更好的性能。LT codes can dramatically enhance the network throughput as a rateless code.By Analyze the application of LT codes,according to the characteristic of transmission data with different priorities,aiming at the performance deficiency of equal error protection LT（EEP-LT）codes,propose the design of unequal error protection LT（UEP-LT） codes with different weight priority.The proposed different weight priority UEP-LT codes provide different protection level to data layer.The performance is judged by the decoding overhead and bit error rate（BER）of standard picture transmission.The results of simulation show that the UEP-LT codes can recover most of high priority data with extremely low decoding overhead,and have a better bit error rate （BER）performance than the equal error protection （EEP）LT codes with a reasonable overhead.Further more,the performance of UEP-LT codes with parabolic priority is better than the UEP-LT codes with linear priority.

关 键 词：LT码 不等差错保护(UEP) 误码率(BER) 不同权重优先级 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]