多用户接入与SLT编码的二维喷泉系统及性能分析  

Two-Dimensional Multiuser Access and SLT Coding Fountain System and Its Performance

作　　者：徐大专[1,2] 邓昭[1,2] Xu Dazhuan;Deng Zhao(Jiangsu Key Laboratory of Internet of Things and Control Technologies,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China;College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China)

机构地区：[1]南京航空航天大学江苏省物联网和控制技术重点实验室,南京210016 [2]南京航空航天大学电子信息工程学院,南京210016

出　　处：《数据采集与处理》2018年第6期945-952,共8页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(61471192;61371169)资助项目;江苏省高等学校优势学科建设工程资助项目

摘　　要：在物联网时代,多用户接入系统的设计将迎来巨大的挑战。本文在现有系统基础上提出了一种多用户接入与SLT编码结合的二维喷泉系统。在时间层上对各用户原始信息进行SLT编码,在用户层上各用户通过接入概率竞争传输,从而构成一种二维喷泉形式,该系统充分利用喷泉编码能有效提高信号抗干扰能力。对于采用SLT编码的每个用户,可以简单地使用置信传播译码算法进行译码。仿真结果表明,与已有多用户接入系统相比,本文提出的系统明显能实现更好的吞吐性能,且解决了已有系统译码算法在较高接入概率下性能急剧下降的问题,从而能给更多的用户进行信息传输的机会,在多用户数据传输中有很好的实用性。In internet of things,the design of multiuser access system will meet great challenges.In this paper,a two-dimensional fountain system of multiuser access and SLT coding is presented based on the existing system.First of all,each user's original information is encoded by SLT codes on the time layer,and then each user competes for transmission according to the access probability on the user layer to form a two-dimensional fountain.The system makes full use of fountain codes to effectively improve the signal anti-interference ability.Secondly,for each user using SLT codes,we can simply employ the belief propagation decoding algorithm to decode.Simulation results show that compared with the existing multiuser access system,the proposed system can significantly achieve better throughput performance and solve the problem that the performance of the existing system decoding algorithm has a sharp decline in the higher access probability,so then can provide more users with the opportunity of information transmission which has good practicability in multiuser data transmission.

关 键 词：数字喷泉码 SLT码 多用户接入 吞吐效率 接入概率 

分 类 号：TN911[电子电信—通信与信息系统]