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arXiv 1503.05858math.COcs.ITmath.IT
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由差集导出的多项式的价值因子

Merit factors of polynomials derived from difference sets

Christian Günther, Kai-Uwe Schmidt

摘要:

在复分析、凝聚态物理学和数字通信工程中,构造具有所有系数$1$或$-1$和大优值因子(相当于单位圆上具有小$L^4$范数)的多项式的问题自然出现。大多数已知的构造(有时以微妙的方式)来自差集,特别是来自Paley和Singer差集。我们考虑从其他差集构造的多项式的渐近优因子,提供了自1991年以来的第一个基本上新的例子。特别是,我们证明了一个一般定理的多项式所产生的分圆,其中包括霍尔和Paley差集的结果作为特殊情况下的渐近价值因子。此外,我们建立了由Gordon-Mills-Welch差集和Sidelnikov几乎差集导出的多项式的渐近价值因子,证明了两个新的定理。

英文摘要:

The problem of constructing polynomials with all coefficients $1$ or $-1$ and large merit factor (equivalently with small $L^4$ norm on the unit circle) arises naturally in complex analysis, condensed matter physics, and digital communications engineering. Most known constructions arise (sometimes in a subtle way) from difference sets, in particular from Paley and Singer difference sets. We consider the asymptotic merit factor of polynomials constructed from other difference sets, providing the first essentially new examples since 1991. In particular we prove a general theorem on the asymptotic merit factor of polynomials arising from cyclotomy, which includes results on Hall and Paley difference sets as special cases. In addition, we establish the asymptotic merit factor of polynomials derived from Gordon-Mills-Welch difference sets and Sidelnikov almost difference sets, proving two recent conjectures.

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