Construction of quasi-cyclic self-dual codes

Sunghyu Han, Jon Lark Kim, Heisook Lee, Yoonjin Lee

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

There is a one-to-one correspondence between ℓ-quasi-cyclic codes over a finite field F q and linear codes over a ring R=F q[Y]/(Y m-1). Using this correspondence, we prove that every ℓ-quasi-cyclic self-dual code of length mℓ over a finite field F q can be obtained by the building-up construction, provided that char(F q)=2 or q=1(mod4), m is a prime p, and q is a primitive element of F p. We determine possible weight enumerators of a binary ℓ-quasi-cyclic self-dual code of length pℓ (with p a prime) in terms of divisibility by p. We improve the result of Bonnecaze et al. (2003) [3] by constructing new binary cubic (i.e., ℓ-quasi-cyclic codes of length 3ℓ) optimal self-dual codes of lengths 30,36,42,48 (Type I), 54 and 66. We also find quasi-cyclic optimal self-dual codes of lengths 40, 50, and 60. When m=5, we obtain a new 8-quasi-cyclic self-dual [40,20,12] code over F 3 and a new 6-quasi-cyclic self-dual [30,15,10] code over F 4. When m=7, we find a new 4-quasi-cyclic self-dual [28,14,9] code over F 4 and a new 6-quasi-cyclic self-dual [42,21,12] code over F 4.

Original languageEnglish
Pages (from-to)613-633
Number of pages21
JournalFinite Fields and their Applications
Volume18
Issue number3
DOIs
StatePublished - May 2012

Keywords

  • Building-up construction
  • Cubic code
  • Quasi-cyclic self-dual code
  • Quintic code

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