中等性能在线喷泉码的设计与分析
Design and Analysis of Online Fountain Codes for Intermediate Performance
摘要：
由于在线喷泉码具有更好的中间性能，近年来引起了人们的广泛关注。然而，在线喷泉码的中间性能和完全恢复开销之间存在权衡，这阻止了它们同时得到改善。我们分析了这种权衡，并建议提高这两个性能。我们首先提出了一种称为在线喷泉码没有建立阶段（OFCNB）的度1编码的符号在第一次发送和建立阶段被删除，以提高中间性能。然后从理论上分析了OFCNB的性能。受分析结果的启发，我们提出了系统在线喷泉码（SOFC），以进一步减少完全恢复开销。理论分析表明，SOFC具有更好的中间性能，并且当信道擦除率低于某一常数时，它也需要更低的完全恢复开销。仿真结果验证了分析的正确性，并表明OFCNB和SOFC的性能优于其他在线喷泉码。
英文摘要：
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.
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