Some new results on mutually orthogonal frequency squares

Some new results on mutually orthogonal frequency squares
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关于相互正交频率平方的一些新结果

DOI:
10.1016/j.disc.2014.05.006
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发表时间:
2014-09
影响因子:
0.8
通讯作者:
Du, Beiliang
Du, Beiliang
中科院分区:
数学3区
文献类型:
--
作者:
Li, Mingchao;Zhang, Yan;Du, Beiliang

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相似文献

设n= λ m。频率平方F(n; λ)是一个n× n的数组,其中m个不同的符号中的每一个在每行和每列中出现λ次。两个这样的正方形被称为正交的,如果在叠加时,m 2个不同的有序对中的每一个恰好出现λ 2次。Hedayat,Sloane和Stufken在他们的书Hedayat等。(1999)给出了一个F(n; λ)型正交频率平方最大个数下界的小表(HSS表),并提出了如下研究问题:改进HSS表中元素的下界。Laywine和马伦在2001年扩展了该表(LM表)。本文给出了正交频率平方的一些新的构造方法。作为应用,我们改进了LM表中一半以上条目的下界。
Let n= λ m. A frequency square F (n; λ) is an n× n array in which each of m distinct symbols appears exactly λ times in each row and column. Two such squares are said to be orthogonal if upon superposition, each of the m 2 distinct ordered pairs occurs exactly λ 2 times. Hedayat, Sloane and Stufken in their book Hedayat et al.(1999) provided a small table of lower bounds for the maximum number of mutually orthogonal frequency squares of type F (n; λ)(HSS Table), and posed the following research problem: Improve the lower bound for the entries in HSS Table. Laywine and Mullen in 2001 extended the table (LM Table). In this article we will give some new construction methods of mutually orthogonal frequency squares. As an application we improve the lower bounds for more than half of the entries in LM Table.
DOI: --
发表时间: 2001
期刊: Ars Comb.
影响因子: --
作者:
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通讯作者: C. Laywine;G. Mullen
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