Bounds on the minimum distance of linear codes

Bounds on linear codes [128,4] over GF(8)

lower bound:110
upper bound:110

Construction

Construction of a linear code [128,4,110] over GF(8):
[1]:  [65, 4, 56] "BCH code (d = 56, b = 38)" Linear Code over GF(2^3)
     BCHCode with parameters 65 56 38
[2]:  [130, 4, 112] Cyclic Linear Code over GF(2^3)
     Juxtaposition of [1] and  [1]
[3]:  [128, 4, 110] Linear Code over GF(2^3)
     Puncturing of [2] at { 129 .. 130 }

last modified: 2001-12-17

From Brouwer's table (as of 2007-02-13)

Lb(128,4) = 110 is found by truncation of:
Lb(130,4) = 112 is found by concatenation of
[65,4,56] and [65,4,56]-codes

Ub(128,4) = 110 follows by a one-step Griesmer bound from:
Ub(17,3) = 13 is found by considering truncation to:
Ub(16,3) = 12 Hi4
References
Hi4: R. Hill, Optimal linear codes, pp. 75-104 in: Cryptography and Coding II (C. Mitchell, ed.), Oxford Univ. Press, 1992.

Notes

  • All codes establishing the lower bounds were constructed using MAGMA.
  • Upper bounds are taken from the tables of Andries E. Brouwer, with the exception of codes over GF(7) with n>50. For most of these codes, the upper bounds are rather weak. Upper bounds for codes over GF(7) with small dimension have been provided by Rumen Daskalov.
  • Special thanks to John Cannon for his support in this project.
  • A prototype version of MAGMA's code database over GF(2) was written by Tat Chan in 1999 and extended later that year by Damien Fisher. The current release version was developed by Greg White over the period 2001-2006.
  • Thanks also to Allan Steel for his MAGMA support.
  • My apologies to all authors that have contributed codes to this table for not giving specific credits.

  • If you have found any code improving the bounds or some errors, please send me an e-mail:
    codes [at] codetables.de


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