TR08-004 Authors: Zeev Dvir, Amir Shpilka

Publication: 18th January 2008 13:43

Downloads: 2311

Keywords:

A Noisy Interpolating Set (NIS) for degree $d$ polynomials is a

set $S \subseteq \F^n$, where $\F$ is a finite field, such that

any degree $d$ polynomial $q \in \F[x_1,\ldots,x_n]$ can be

efficiently interpolated from its values on $S$, even if an

adversary corrupts a constant fraction of the values. In this

paper we construct explicit NIS for every prime field $\F_p$ and

any degree $d$. Our sets are of size $O(n^d)$ and have efficient

interpolation algorithms that can recover $q$ from a fraction

$\exp(-O(d))$ of errors.

Our construction is based on a theorem which roughly states that

if $S$ is a NIS for degree 1 polynomials then $d \cdot S= \{ a_1 +

\ldots + a_d \,|\, a_i \in S\}$ is a NIS for degree $d$

polynomials. Furthermore, given an efficient interpolation

algorithm for $S$, we show how to use it in a black-box manner to

build an efficient interpolation algorithm for $d \cdot S$.

As a corollary we get an explicit family of punctured Reed-Muller

codes that is a family of good codes that have an efficient

decoding algorithm from a constant fraction of errors. To the best

of our knowledge no such construction was known previously.