Weight distributions of all irreducible $\mu$-constacyclic codes of length $\ell^n$. (arXiv:1806.10600v1 [math.CO])

Let $\mathbb{F}_q$ be a finite field of order $q$ and integer $n\ge 1$. Let $\ell$ be a prime such that $\ell^k|(q-1)$ for some integer $k\ge 1$ and $\mu$ be an element of order $\ell^k$ in $\mathbb{F}_q$. In this paper, we determine the weight distributions of all irreducible $\mu$-constacyclic codes of length $\ell^n$ over $\mathbb{F}_q$. Explicit expressions for the generator polynomials and codewords of these codes are also obtained.

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