학술논문
List-Decodability With Large Radius for Reed-Solomon Codes
Document Type
Periodical
Author
Source
IEEE Transactions on Information Theory IEEE Trans. Inform. Theory Information Theory, IEEE Transactions on. 68(6):3823-3828 Jun, 2022
Subject
Language
ISSN
0018-9448
1557-9654
1557-9654
Abstract
List-decodability of Reed–Solomon codes has received a lot of attention, but the best-possible dependence between the parameters is still not well-understood. In this work, we focus on the case where the list-decoding radius is of the form $r=1-\varepsilon $ for $\varepsilon $ tending to zero. Our main result states that there exist Reed–Solomon codes with rate $\Omega (\varepsilon)$ which are $(1-\varepsilon, O(1/\varepsilon))$ -list-decodable, meaning that any Hamming ball of radius $1-\varepsilon $ contains at most $O(1/\varepsilon)$ codewords. This trade-off between rate and list-decoding radius is best-possible for any code with list size less than exponential in the block length. By achieving this trade-off between rate and list-decoding radius we improve a recent result of Guo, Li, Shangguan, Tamo, and Wootters, and resolve the main motivating question of their work. Moreover, while their result requires the field to be exponentially large in the block length, we only need the field size to be polynomially large (and in fact, almost-linear suffices). We deduce our main result from a more general theorem, in which we prove good list-decodability properties of random puncturings of any given code with very large distance.