Bounds on the minimum distance of linear codes
Bounds on linear codes [148,9] over GF(4)
ConstructionConstruction type: Maruta
Construction of a linear code [148,9,98] over GF(4):
: [148, 9, 98] Linear Code over GF(2^2)
Take the first 146 points of the orbit of the companion matrix of x^9 + w*x^8 + w^2*x^7 + x^5 + w*x^4 + w^2*x^2 + x + w as columns of the generator matrix
and append the column vectors [
( 0 1 w^2 1 w^2 w 1 w^2 w^2),
( 1 w^2 0 0 w w^2 1 0 0)
last modified: 2004-10-22
From Brouwer's table (as of 2007-02-13)
Lb(148,9) = 98 MTS
Ub(148,9) = 105 is found by considering shortening to:
Ub(146,7) = 105 is found by considering truncation to:
Ub(144,7) = 103 DM3
R. N. Daskalov & E. Metodieva, Bounds on minimum length for quaternary linear
codes in dimensions six and seven, Mathematics and Education in Mathematics,
Sofia, (1994) 156-161.
Tatsuya Maruta, Mito Takenaka, Maori Shinohara & Yukie Shobara, Constructing
new linear codes from pseudo-cyclic codes, pp. 292-298 in Proc. 9th
International Workshop on Algebraic and Combinatorial Coding Theory(ACCT) in
Kranevo, Bulgaria, 2004.
- All codes establishing the lower bounds were constructed using
- 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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