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### Paper:

TR18-032 | 14th February 2018 03:11

#### Explicit Binary Tree Codes with Polylogarithmic Size Alphabet

TR18-032
Authors: Gil Cohen, Bernhard Haeupler, Leonard Schulman
Publication: 15th February 2018 23:24
Keywords:

Abstract:

This paper makes progress on the problem of explicitly constructing a binary tree code with constant distance and constant alphabet size.

For every constant $\delta < 1$ we give an explicit binary tree code with distance $\delta$ and alphabet size $(\log{n})^{O(1)}$, where $n$ is the depth of the tree. This is the first improvement over a two-decade-old construction that has an exponentially larger alphabet of size $n^{O(1)}$.

As part of the analysis, we prove a bound on the number of positive integer roots a real polynomial can have in terms of its sparsity with respect to the Newton basis - a result of independent interest.

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