基于Raptor码的无线传感器网络数据分布存储

Wireless sensor network data distributed storage based on Raptor code

在无线传感器网络中,经常出现节点失效等意外情况。如何实现数据的分布式存储是无线传感器研究的重点。根据以包为中心编码的相关研究,提出了一种基于Raptor码的无线传感器分布式数据存储方案。Raptor码是喷泉码的一种,是一种在删除信道上有效的低复杂度的编码。通过预编码形成虚拟节点,使校验包更多的参与LT编码(Luby transform code),提高了编码的随机性。实验证明在有噪声条件下,具有优于分布式LT码的性能。

In wireless sensor networks, node failure accidents often occur.How to realize the distributed data storage is the key in the research of wireless sensors.According to related research with the package as the center code, this paper proposes a novel wireless sensor network distributed data storage scheme based on Raptor codes.Raptor code is a kind of fountain code, as well as an effective, low complex coding scheme over erasure channels.By form-ing virtual nodes in the pre-coding phase, this algorithm makes the parity packets more involved in Luby Transform （ LT） coding, which improves the coding randomness.The experiment proved that in noisy conditions this scheme has better performance than LT codes.