文摘
Let \(\mathbb {F}_q\) be a finite field of cardinality \(q\), \(l\) a prime number and \(\mathbb {F}_{q^l}\) an extension field of \(\mathbb {F}_q\) with degree \(l\). The structure and canonical form decompositions of semisimple multivariable \(\mathbb {F}_q\)-linear codes over \(\mathbb {F}_{q^l}\) are presented. Enumeration and construction of these codes are then investigated. Especially, dual codes, self-orthogonality and self-duality of semisimple abelian \(\mathbb {F}_q\)-linear codes over \(\mathbb {F}_{q^l}\) are studied. Furthermore, self-dual and \(\gamma \)-self dual semisimple abelian \(\mathbb {F}_q\)-linear codes over \(\mathbb {F}_{q^2}\) are considered. Keywords Semisimple multivariable \(\mathbb {F}_q\)-linear code Semisimple abelian \(\mathbb {F}_q\)-linear code Dual code Self-orthogonal code Self-dual code