CAJ | 학술논문

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。
수자분천마시일충무속솔마，능구유효피면대규모망락엄파조파전수중적“반궤풍폭”문제，재대수거적망락전수중구유엄활적응용전경。본문논술료당전수자분천마적연구현상，분별개소료불동신도조건하궤충전형적수자분천마。도분포시수자분천마설계적기출，본문총결료현유수자분천마도분포우화설계방면적연구공작，중점개소료불동신도하기우밀도연화방법적도분포설계모형，병분석료존재적불족급개진지처。최후，대수자분천마적설계、응용화발전추세급출료분석화전망。
Digital fountain codes are an effective kind of rateless codes to avoid “feedback storm” in net‐work 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 improve‐ments are proposed .Finally ,the outlook of optimization design in degree distributions and applications of digital fountain codes is analyzed .