Abstract
The decomposition of a quasi-abelian code into shorter linear codes over larger alphabets was given in Jitman and Ling (Des Codes Cryptogr 74:511–531, 2015), extending the analogous Chinese remainder decomposition of quasi-cyclic codes (Ling and Solé in IEEE Trans Inf Theory 47:2751–2760, 2001). We give a concatenated decomposition of quasi-abelian codes and show, as in the quasi-cyclic case, that the two decompositions are equivalent. The concatenated decomposition allows us to give a general minimum distance bound for quasi-abelian codes and to construct some optimal codes. Moreover, we show by examples that the minimum distance bound is sharp in some cases. In addition, examples of large strictly quasi-abelian codes of about a half rate are given. The concatenated structure also enables us to conclude that strictly quasi-abelian linear complementary dual codes over any finite field are asymptotically good.
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Acknowledgements
The first author was partially supported by PEPS - Jeunes Chercheur-e-s - 2018. The second author was supported by TÜBİTAK Project no. 114F432. The third author is supported by the Swiss Confederation through the Swiss Goverment Excellence Scholarship no: 2019.0413 and by the Swiss National Science Foundation grant n. 188430.
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This is one of several papers published in Designs, Codes and Cryptography comprising the “Special Issue: On Coding Theory and Combinatorics: In Memory of Vera Pless”
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Borello, M., Güneri, C., Saçıkara, E. et al. The concatenated structure of quasi-abelian codes. Des. Codes Cryptogr. 90, 2647–2661 (2022). https://doi.org/10.1007/s10623-021-00921-4
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DOI: https://doi.org/10.1007/s10623-021-00921-4
Keywords
- Quasi-abelian codes
- Concatenated codes
- Linear complementary dual codes
- Optimal codes
- Additive abelian codes