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arXiv · 1711.04714

Towards a Converse for the Nearest Lattice Point Problem

Vinay A. Vaishampayan
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Abstract

Upper bounds on the communication complexity of finding the nearest lattice point in a given lattice $\Lambda \subset \mathbb{R}^2$ was considered in earlier works~\cite{VB:2017}, for a two party, interactive communication model. Here we derive a lower bound on the communication complexity of a key step in that procedure. Specifically, the problem considered is that of interactively finding $\min(X_1,X_2)$, when $(X_1,X_2)$ is uniformly distributed on the unit square. A lower bound is derived on the single-shot interactive communication complexity and shown to be tight. This is accomplished by characterizing the constraints placed on the partition generated by an interactive code and exploiting a self similarity property of an optimal solution.

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Vinay A. Vaishampayan. 2017-11-13. Towards a Converse for the Nearest Lattice Point Problem. https://arxiv.org/abs/1711.04714

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