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Weight distribution of random linear codes and Krawchouk ...
Alex Samorodnitsky · 2022-05-04 · via cs.IT updates on arXiv.org

For $0 < λ< 1$ and $n \rightarrow \infty$ pick uniformly at random $λn$ vectors in $\{0,1\}^n$ and let $C$ be the orthogonal complement of their span. Given $0 < γ< \frac12$ with $0 < λ< h(γ)$, let $X$ be the random variable that counts the number of words in $C$ of Hamming weight $i = γn$ (where $i$ is assumed to be an even integer). Linial and Mosheiff determined the asymptotics of the moments of $X$ of all orders $o\left(\frac{n}{\log n}\right)$. In this paper we extend their estimates up to moments of linear order. Our key observation is that the behavior of the suitably normalized $k^{th}$ moment of $X$ is essentially determined by the $k^{th}$ norm of the Krawchouk polynomial $K_i$.