Bounds on the minimum distance of linear codes

Bounds on linear codes [244,15] over GF(2)

Construction

Construction of a linear code [244,15,108] over GF(2):
[1]:  [243, 16, 107] Linear Code over GF(2)
     Construction from a stored generator matrix:

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[2]:  [244, 16, 108] Linear Code over GF(2)
     ExtendCode [1] by 1
[3]:  [244, 15, 108] Linear Code over GF(2)
     Subcode of [2]

last modified: 2001-01-30

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

Lb(244,15) = 108 is found by taking a subcode of:
Lb(244,16) = 108 is found by adding a parity check bit to:
Lb(243,16) = 107 GG1

Ub(244,15) = 114 is found by considering shortening to:
Ub(243,14) = 114 is found by considering lengthening to:
Ub(244,14) = 114 otherwise adding a parity check bit would contradict:
Ub(245,14) = 115 BK 

References

GG1: B. Groneick & S. Grosse, priv. comm. and comm. via W. Scharlau, 1992-1993.

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