Z₂Z₄-additive cyclic codes, generator polynomials and dual codes

Abstract

A Z₂Z₄-additive code C ⊆ Zα2 × Zβ₄ is called cyclic code if the set of coordinates can be partitioned into two subsets, the set of Z₂ and the set of Z₄ coordinates, such that any cyclic shift of the coordinates of both subsets leaves invariant the code. These codes can be identified as submodules of the Z₄[x]-module Z₂[x]/(x^α - 1) × Z₄ [x]/(x^β - 1). The parameters of a Z₂Z₄-additive cyclic code are stated in terms of the degrees of the generator polynomials of the code. The generator polynomials of the dual code of a Z₂Z₄-additive cyclic code are determined in terms of the generator polynomials of the code C.