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Consta-dihedral Codes over Finite Fields
Yun Fan, Yue Leng · 2023-03-01 · via cs.IT updates on arXiv.org

It is proved in a reference (Fan, Lin, IEEE TIT, vol.67, pp.5016-5025) that the self-dual (LCD respectively) dihedral codes over a finite field~$F$ with ${|F|=q}$ are asymptotically good if $q$ is even (odd respectively). In this paper, we investigate the algebraic property and the asymptotic property of conta-dihedral codes over $F$, and show that: if $q$ is even or $4\,|\,(q-1)$, then the self-dual consta-dihedral codes are asymptotically good; otherwise, the LCD consta-dihedral codes are asymptotically good. And, with the help of a technique developed in this paper, some errors in the reference mentioned above are corrected.

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