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arXiv 2104.14587cs.ITmath.COmath.IT
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二进制码第一线性规划界的再证明及两个证明

One more proof of the first linear programming bound for binary codes and two conjectures

Alex Samorodnitsky

摘要:

我们给一个证明的第一个线性规划界的二进制代码,以下的工作线开始弗里德曼和蒂利希。新的论证与以前的证明有些相似,但我们相信它更简单,更直观。此外,它提供了以下的'几何'的解释的界限。具有最小距离$δn$的二进制码是小的,因为其元素的特征函数在由权值高达$\left(\frac 12 - \sqrt{δ(1-δ)}\right) \cdot n$的沃尔什-傅立叶特征所张成的子空间上的投影基本上是独立的。因此,码的基数由子空间的维数限制。我们提出了两个apturtures,建议的新的证明,一个线性和一般的二进制码,如果真的,将导致改善的第一线性规划界。线性码的猜想与哈斯塔德、卡莱和利尼亚尔的猜想有关,并受其影响。我们验证了随机线性码和一般随机码的(简单)情况下的结构。

英文摘要:

We give one more proof of the first linear programming bound for binary codes, following the line of work initiated by Friedman and Tillich. The new argument is somewhat similar to previous proofs, but we believe it to be both simpler and more intuitive. Moreover, it provides the following 'geometric' explanation for the bound. A binary code with minimal distance $δn$ is small because the projections of the characteristic functions of its elements on the subspace spanned by the Walsh-Fourier characters of weight up to $\left(\frac 12 - \sqrt{δ(1-δ)}\right) \cdot n$ are essentially independent. Hence the cardinality of the code is bounded by the dimension of the subspace. We present two conjectures, suggested by the new proof, one for linear and one for general binary codes which, if true, would lead to an improvement of the first linear programming bound. The conjecture for linear codes is related to and is influenced by conjectures of Håstad and of Kalai and Linial. We verify the conjectures for the (simple) cases of random linear codes and general random codes.

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