Skew cyclic and skew $(\alpha_1 + u\alpha_2 + v\alpha_3 + uv\alpha_4)$-constacyclic codes over $F_q + uF_q + vF_q + uvF_q$

TL;DR

This paper investigates skew cyclic and skew constacyclic codes over a specific ring, revealing their Gray images, equivalence to other code types, and structural properties like generating polynomials.

Contribution

It introduces a decomposition method to determine structural properties of these codes, including generating polynomials and idempotent generators.

Findings

Gray images are skew quasi-cyclic codes over F_q

Codes are either equivalent to constacyclic or quasi-twisted codes

Structural properties are characterized by decomposition method

Abstract

In this note, we study skew cyclic and skew constacyclic codes over the ring $\mathcal{R}=F_{q}+uF_{q}+vF_{q}+uvF_{q}$ where $q=p^{m},$ $p$ is an odd prime, $u^{2}=u,~v^{2}=v,~uv=vu$. We show that Gray images of a skew cyclic and skew $\alpha$-constacyclic code of length $n$ are skew quasi-cyclic code of length $4n$ over $F_{q}$ of index 4. Also, it is shown that skew $\alpha$-constacyclic codes are either equivalent to $\alpha$-constacyclic codes or $\alpha$-quasi-twisted codes over $\mathcal{R}$. Further, structural properties, specially, generating polynomials and idempotent generators for skew cyclic and skew constacyclic codes are determined by decomposition method.