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TR08-004 | 2nd January 2008 00:00

Noisy Interpolating Sets for Low Degree Polynomials


Authors: Zeev Dvir, Amir Shpilka
Publication: 18th January 2008 13:43
Downloads: 1397


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.

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