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arXiv 2008.13075cs.ITmath.IT
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分布式八拜点计算的通信研究

On Communication for Distributed Babai Point Computation

Maiara F. Bollauf, Vinay A. Vaishampayan, Sueli I. R. Costa

摘要:

我们提出了一个通信高效的分布式协议计算的Babai点,一个近似最近的随机向量${\bf X}\in\mathbb{R}^n$在一个给定的格子点。我们表明,该协议是最佳的意义上,它最小化的总和率时,${\bf X}$的组件是相互独立的。然后我们研究错误概率,即Babai点与最近的格点不重合的概率。在二维和三维中,可以看到这种概率随着堆积密度的增加而增加。对于更高的维度,我们使用概率论的界来估计一些著名的格的错误概率。我们的研究表明,对于均匀分布,错误概率随着晶格的维数而变大,对于具有良好填充密度的晶格。我们还考虑的情况下,$\mathbf{X}$是通过添加高斯噪声随机选择的晶格点。在这种情况下,当噪声方差足够小时,错误概率随着晶格维度而变为零。在这种情况下,用于找到近似最近格点的分布式算法足以找到最近格点。

英文摘要:

We present a communication-efficient distributed protocol for computing the Babai point, an approximate nearest point for a random vector ${\bf X}\in\mathbb{R}^n$ in a given lattice. We show that the protocol is optimal in the sense that it minimizes the sum rate when the components of ${\bf X}$ are mutually independent. We then investigate the error probability, i.e. the probability that the Babai point does not coincide with the nearest lattice point. In dimensions two and three, this probability is seen to grow with the packing density. For higher dimensions, we use a bound from probability theory to estimate the error probability for some well-known lattices. Our investigations suggest that for uniform distributions, the error probability becomes large with the dimension of the lattice, for lattices with good packing densities. We also consider the case where $\mathbf{X}$ is obtained by adding Gaussian noise to a randomly chosen lattice point. In this case, the error probability goes to zero with the lattice dimension when the noise variance is sufficiently small. In such cases, a distributed algorithm for finding the approximate nearest lattice point is sufficient for finding the nearest lattice point.

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