arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.06937cs.ITmath.COmath.IT
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多层结构的边界

Bounds for the multilevel construction

Tao Feng, Sascha Kurz, Shuangqing Liu

摘要:

随机网络编码中的一个主要问题是在给定的最小距离上计算所谓的子空间码在射影空间$\mathcal{P}_q(n)$中的可达基数的良好的上下界。确定精确的最大基数是一个非常困难的离散优化问题,涉及大量的对称性。除了\textit{good}子空间码的一些显式构造外,几个最成功的完全构造涉及离散优化子问题本身的求解,这些子问题大多没有得到系统的解决。在这里,我们考虑多层次a.k.a.\ Echelon-Ferrers构造并给出了可实现基数的上下界。从更一般的角度来看,我们解决最大团问题的加权图,其中的权重可以是多项式的字段大小$q$。

英文摘要:

One of the main problems in random network coding is to compute good lower and upper bounds on the achievable cardinality of the so-called subspace codes in the projective space $\mathcal{P}_q(n)$ for a given minimum distance. The determination of the exact maximum cardinality is a very tough discrete optimization problem involving a huge number of symmetries. Besides some explicit constructions for \textit{good} subspace codes several of the most success full constructions involve the solution of discrete optimization subproblems itself, which mostly have not been not been solved systematically. Here we consider the multilevel a.k.a.\ Echelon--Ferrers construction and given lower and upper bounds for the achievable cardinalities. From a more general point of view, we solve maximum clique problems in weighted graphs, where the weights can be polynomials in the field size $q$.

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