## Bounds on the minimum distance of linear codes

### Bounds on linear codes [240,9] over GF(3)

 lower bound: 152 upper bound: 154

### Construction

```Construction of a linear code [240,9,152] over GF(3):
[1]:  [1, 1, 1] Cyclic Linear Code over GF(3)
RepetitionCode of length 1
[2]:  [242, 10, 153] "BCH code (d = 153, b = 91)" Linear Code over GF(3)
BCHCode with parameters 242 153 91
[3]:  [242, 11, 152] "BCH code (d = 152, b = 91)" Linear Code over GF(3)
BCHCode with parameters 242 152 91
[4]:  [243, 11, 153] Linear Code over GF(3)
ConstructionX using [3] [2] and [1]
[5]:  [242, 11, 152] "BCH code (d = 152, b = 91)" Linear Code over GF(3)
Puncturing of [4] at { 243 }
[6]:  [240, 9, 152] Linear Code over GF(3)
Shortening of [5] at { 241 .. 242 }

```

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

```Lb(240,9) = 152 is found by shortening of:
Lb(242,11) = 152 is found by truncation of:
Lb(243,11) = 153 XBC

Ub(240,9) = 154 is found by considering truncation to:
Ub(239,9) = 153 Gur
```
###### References
Gur: Sugi Guritman, Restrictions on the weight distribution of linear codes, Thesis, Techn. Univ. Delft, 2000.

XBC: Extended BCH code.

### 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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