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- W3204362801 abstract "We prove the existence of Reed-Solomon codes of any desired rate $R in (0,1)$ that are combinatorially list-decodable up to a radius approaching $1-R$, which is the information-theoretic limit. This is established by starting with the full-length $[q,k]_q$ Reed-Solomon code over a field $mathbb F_q$ that is polynomially larger than the desired dimension $k$, and it by including $k/R$ randomly chosen codeword positions. Our puncturing result is more general and applies to any code with large minimum distance: we show that a random rate $R$ puncturing of an $mathbb F_q$-linear mother code whose relative distance is close enough to $1-1/q$ is list-decodable up to a radius approaching the $q$-ary list-decoding capacity bound $h_q^{-1}(1-R)$. In fact, for large $q$, or under a stronger assumption of low-bias of the mother-code, we prove that the threshold rate for list-decodability with a specific list-size (and more generally, any local property) of the random puncturing approaches that of fully random linear codes. Thus, all current (and future) list-decodability bounds shown for random linear codes extend automatically to random puncturings of any low-bias (or large alphabet) code. This can be viewed as a general derandomization result applicable to random linear codes. To obtain our conclusion about Reed-Solomon codes, we establish some hashing properties of field trace maps that allow us to reduce the list-decodability of RS codes to its associated trace (dual-BCH) code, and then apply our puncturing theorem to the latter. Our approach implies, essentially for free, optimal rate list-recoverability of punctured RS codes as well." @default.
- W3204362801 created "2021-10-11" @default.
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- W3204362801 date "2021-09-24" @default.
- W3204362801 modified "2023-10-15" @default.
- W3204362801 title "Punctured Large Distance Codes, and Many Reed-Solomon Codes, Achieve List-Decoding Capacity" @default.
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