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Perfect codes in the discrete simplex

机译:离散单纯形中的完美代码

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We study the problem of existence of (nontrivial) perfect codes in the discrete n-simplex Δ_ℓ~n := {(x_0,…,x_n) : x_i ∈ Z_+, ∑_i x_i = ℓ} under ℓ_1 metric. The problem is motivated by the so-called multiset codes, which have recently been introduced by the authors as appropriate constructs for error correction in the permutation channels. It is shown that ℓ-perfect codes in the 1-simplex Δ_ℓ~1 exist for any ℓ ≥ 2e + 1, the 2-simplex Δ_ℓ~2 admits an e-perfect code if and only if ℓ - 3e +1, while there are no perfect codes in higher-dimensional simplices. In other words, perfect multiset codes exist only over binary and ternary alphabets.
机译:我们研究了在ℓ_1度量下离散n-单形Δ_ℓ〜n:= {(x_0,…,x_n):x_i∈Z_ +,∑_i x_i =ℓ}中存在(非平凡)完美代码的问题。该问题是由所谓的多集码引起的,该码集最近由作者引入,作为用于置换信道中的纠错的适当构造。结果表明,对于任何≥≥2e + 1,在1-simplexΔ_ℓ〜1中都存在ℓ-完美码,当且仅当ℓ-3e +1时,2-simplexΔ_ℓ〜2接受e-perfect码。在高维单纯形中不是完美的代码。换句话说,完美的多集代码仅存在于二进制和三进制字母上。

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