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Design and Analysis of LT Codes with Decreasing Ripple Size

机译:纹波尺寸减小的LT码的设计与分析

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摘要

In this paper we propose a new design of LT codes, which decreases the amount of necessary overhead in comparison to existing designs. The design focuses on a parameter of the LT decoding process called the ripple size. This parameter was also a key element in the design proposed in the original work by Luby. Specifically, Luby argued that an LT code should provide a constant ripple size during decoding. In this work we show that the ripple size should decrease during decoding, in order to reduce the necessary overhead. Initially we motivate this claim by analytical results related to the redundancy within an LT code. We then propose a new design procedure, which can provide any desired achievable decreasing ripple size. The new design procedure is evaluated and compared to the current state of the art through simulations. This reveals a significant increase in performance with respect to both average overhead and error probability at any fixed overhead.
机译:在本文中,我们提出了一种新的LT代码设计,与现有设计相比,该设计减少了必要的开销。该设计着重于LT解码过程中称为波纹大小的参数。该参数也是Luby最初工作中提出的设计中的关键要素。具体地说,Luby认为LT代码在解码期间应提供恒定的纹波大小。在这项工作中,我们证明了在解码期间应减小纹波大小,以减少必要的开销。最初,我们通过与LT代码内的冗余相关的分析结果来激发这种主张。然后,我们提出了一种新的设计程序,该程序可以提供任何所需的可实现的减小的纹波大小。评估新的设计程序,并通过仿真将其与最新技术进行比较。这揭示了在任何固定开销下,相对于平均开销和错误概率而言,性能都有了显着提高。

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