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arXiv 0709.1074cs.ITmath.IT
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常维码的Johnson型界

Johnson Type Bounds on Constant Dimension Codes

Shu-Tao Xia, Fang-Wei Fu

摘要:

最近,Koetter和Kschischang在研究随机网络编码时定义了运营商信道。他们还介绍了恒定尺寸的代码,并证明这些代码可以用来纠正错误和/或擦除的运营商通道。常维码等价于Wang,Xing和Safavi-Naini在2003年构造分布式认证系统时提出的线性认证码。本文研究了常维码。证明了Steiner结构是达到Wang-Xing-Safavi-Naini界的最优常维码。此外,我们证明了常维码达到Wang-Xing-Safavi-Naini界的充要条件是它们是某些Steiner结构。然后,我们得到两个约翰逊型上界,说我和II,常维码。Johnson型界II比Wang-Xing-Safavi-Naini界稍有改进。最后,我们指出,一个家庭的已知Steiner结构实际上是一个家庭的最佳常数维码实现约翰逊型界I和II。

英文摘要:

Very recently, an operator channel was defined by Koetter and Kschischang when they studied random network coding. They also introduced constant dimension codes and demonstrated that these codes can be employed to correct errors and/or erasures over the operator channel. Constant dimension codes are equivalent to the so-called linear authentication codes introduced by Wang, Xing and Safavi-Naini when constructing distributed authentication systems in 2003. In this paper, we study constant dimension codes. It is shown that Steiner structures are optimal constant dimension codes achieving the Wang-Xing-Safavi-Naini bound. Furthermore, we show that constant dimension codes achieve the Wang-Xing-Safavi-Naini bound if and only if they are certain Steiner structures. Then, we derive two Johnson type upper bounds, say I and II, on constant dimension codes. The Johnson type bound II slightly improves on the Wang-Xing-Safavi-Naini bound. Finally, we point out that a family of known Steiner structures is actually a family of optimal constant dimension codes achieving both the Johnson type bounds I and II.

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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