基于不等差错保护喷泉码的LTP协议  

LTP based on Unequal Error Protection fountain code

作　　者：曹浩男 程子敬[1] 刘亚丽 李周 赵阳[1] CAO Haonan;CHENG Zijing;LIU Yali;LI Zhou;ZHAO Yang(Space Star Technology Co.,LTD.,China Academy of Space Technology,Beijing 100091,China)

机构地区：[1]中国空间技术研究院航天恒星科技有限公司,北京100091

出　　处：《太赫兹科学与电子信息学报》2020年第2期222-227,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(91538202)。

摘　　要：Licklider传输协议(LTP)是深空通信中一个重要协议,但其自动重传(ARQ)机制无法满足传输时延的要求。为了利用喷泉码无需反馈的特点,降低LTP协议传输时延,同时满足LTP协议中红色数据和绿色数据不同可靠性的要求,将具有不等差错保护(UEP)特性的喷泉码引入LTP协议,得到具有不等差错保护特性的LTP(UEP-LTP)。对喷泉码不同的度分配不同的选窗概率,构造一个指数型的选窗概率函数并对该函数进行优化,由此获得性能更优的UEP-LTP(AUEP-LTP)。仿真结果表明,AUEP-LTP的红、绿色数据误码率可分别达到10-10.473 2和10-3.687 8,满足红、绿色数据不同可靠性要求,同时可减少LTP重传,提高协议性能,更适用于深空通信。The Licklider Transmission Protocol(LTP) is an important protocol in deep space communication, but its Automatic Repeat-reQuest(ARQ) mechanism cannot meet the transmission delay requirements. In order to take advantage of the fountain code without feedback and meet the different reliability requirements of red data and green data in the LTP, first of all, the fountain code with characteristics of Unequal Error Protection(UEP) is introduced into the LTP to obtain the LTP with characteristics of UEP(UEP-LTP). Then an exponential window selection probability function is constructed by assigning different selection probabilities of windows to different degrees of the fountain code, and the function is optimized to obtain an Advanced UEP-LTP(AUEP-LTP) with better performance. The simulation results show that the bit error rate of red data and green data of AUEP-LTP can reach 10-10.473 2 and 10-3.687 8 respectively, which can meet the different reliability requirements of red data and green data, reduce the retransmission of LTP and improve the performance, and is more suitable for deep space communication.

关 键 词：深空通信 Licklider传输协议 喷泉码 不等差错保护 可靠性 

分 类 号：TN919.3[电子电信—通信与信息系统]