论文标题
在线喷泉代码的设计和分析中级性能
Design and Analysis of Online Fountain Codes for Intermediate Performance
论文作者
论文摘要
为了改善中级性能，最近在线喷泉代码引起了很多研究的关注。但是，在线喷泉代码中，中级性能与全部恢复开销之间存在权衡，这使它们可以同时改进。我们分析了这一权衡，并建议改善这两种表现。我们首先提出了一种称为在线喷泉代码的方法，而无需堆积阶段（OFCNB），在该阶段（OFCNB）首先传输了学位-1编码的符号，并删除了堆积阶段以提高中间性能。然后，我们从理论上分析了OFCNB的性能。在分析结果的激励下，我们提出了系统的在线喷泉代码（SOFC），以进一步减少全部恢复开销。理论分析表明，SOFC具有更好的中间性能，并且当通道擦除速率低于常数时，它也需要较低的完全恢复开销。模拟结果验证了分析，并证明了与其他在线喷泉代码相比，OFCNB和SOFC的出色性能。
For the benefit of improved intermediate performance, recently online fountain codes attract much research attention. However, there is a trade-off between the intermediate performance and the full recovery overhead for online fountain codes, which prevents them to be improved simultaneously. We analyze this trade-off, and propose to improve both of these two performance. We first propose a method called Online Fountain Codes without Build-up phase (OFCNB) where the degree-1 coded symbols are transmitted at first and the build-up phase is removed to improve the intermediate performance. Then we analyze the performance of OFCNB theoretically. Motivated by the analysis results, we propose Systematic Online Fountain Codes (SOFC) to further reduce the full recovery overhead. Theoretical analysis shows that SOFC has better intermediate performance, and it also requires lower full recovery overhead when the channel erasure rate is lower than a constant. Simulation results verify the analyses and demonstrate the superior performance of OFCNB and SOFC in comparison to other online fountain codes.
