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arXiv 1201.6459cs.ITmath.IT
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网络纠错码的拟阵框架

A Matroidal Framework for Network-Error Correcting Codes

K. Prasad, B. Sundar Rajan

摘要:

我们抽象了网络检错码和纠错码的基本概念,给出了拟阵检错网络和拟阵纠错网络的定义。一个无环网络(任意汇需求),然后具有标量线性错误检测(纠正)网络代码,当且仅当它是一个拟阵错误检测(纠正)网络与一个可表示的拟阵。因此,构造这种网络纠错码和检错码意味着构造满足某些特殊条件的可表示拟阵,反之亦然。然后,我们提出的算法,使建设拟阵误差检测和校正网络具有特定的网络纠错能力。使用这些构造算法,一大类迄今未知的具有多播和多单播网络-纠错码的标量线性可解网络可用于理论使用和实际实现,其参数诸如信息符号数、汇点数、编码节点数、纠错能力、等等,是任意的,但是对于计算能力(对于算法的执行)。这些网络的建设的复杂性被证明是现有的算法,设计多播标量线性网络的复杂性-纠错码。最后,我们还表明,线性网络编码是不充分的一般网络错误检测问题的任意需求。特别是,对于相同数量的网络错误,我们展示了一个网络,其中有一个非线性的网络错误检测码,满足在汇的需求,而没有线性的网络错误检测码,做同样的。

英文摘要:

We abstract the essential aspects of network-error detecting and correcting codes to arrive at the definitions of matroidal error detecting networks and matroidal error correcting networks. An acyclic network (with arbitrary sink demands) is then shown to possess a scalar linear error detecting (correcting) network code if and only if it is a matroidal error detecting (correcting) network associated with a representable matroid. Therefore, constructing such network-error correcting and detecting codes implies the construction of certain representable matroids that satisfy some special conditions, and vice versa. We then present algorithms which enable the construction of matroidal error detecting and correcting networks with a specified capability of network-error correction. Using these construction algorithms, a large class of hitherto unknown scalar linearly solvable networks with multisource multicast and multiple-unicast network-error correcting codes is made available for theoretical use and practical implementation, with parameters such as number of information symbols, number of sinks, number of coding nodes, error correcting capability, etc. being arbitrary but for computing power (for the execution of the algorithms). The complexity of the construction of these networks is shown to be comparable to the complexity of existing algorithms that design multicast scalar linear network-error correcting codes. Finally we also show that linear network coding is not sufficient for the general network-error detection problem with arbitrary demands. In particular, for the same number of network-errors, we show a network for which there is a nonlinear network-error detecting code satisfying the demands at the sinks, while there are no linear network-error detecting codes that do the same.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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