Abstract
Optimal double circulant self-dual codes over F/sub 4/ have been found for each length n/spl les/40. For lengths n/spl les/14, 20, 22, 24, 28, and 30, these codes are optimal self-dual codes. For length 26, the code attains the highest known minimum weight. For n/spl ges/32, the codes presented provide the highest known minimum weights. The [36,18,12] self-dual code improves the lower bound on the highest minimum weight for a [36,18] linear code.
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