摘要
数字喷泉码是一种无速率码,能够有效避免大规模网络广播组播传输中的"反馈风暴"问题,在大数据的网络传输中具有广阔的应用前景。本文论述了当前数字喷泉码的研究现状,分别介绍了不同信道条件下几种典型的数字喷泉码。度分布是数字喷泉码设计的基础,本文总结了现有数字喷泉码度分布优化设计方面的研究工作,重点介绍了不同信道下基于密度演化方法的度分布设计模型,并分析了存在的不足及改进之处。最后,对数字喷泉码的设计、应用和发展趋势给出了分析和展望。
Digital fountain codes are an effective kind of rateless codes to avoid＂feedback storm＂in network broadcast/multicast with a wide horizon of development in the network transmission of big data.Therefore,the recent research progress of digital fountain codes is summerized and some typical digital fountain codes are introduced in different channels.Since degree distributions are fundamental to design digital fountain codes,previous work about optimization design of degree distributions is summarized and some linear optimization techniques over different channels based on density evolution are presented in particular.Meanwhile,the problems of optimization design are pointed out and some possible improvements are proposed.Finally,the outlook of optimization design in degree distributions and applications of digital fountain codes is analyzed.
出处
《数据采集与处理》
CSCD
北大核心
2015年第4期733-746,共14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"物联网与控制技术"重点实验室基金资助项目
关键词
数字喷泉码
度分布
优化设计
密度演化
digital fountain codes
degree distribution
optimization design
density evolution
