Best Known (18−6, 18, s)-Nets in Base 81
(18−6, 18, 177150)-Net over F81 — Constructive and digital
Digital (12, 18, 177150)-net over F81, using
- net defined by OOA [i] based on linear OOA(8118, 177150, F81, 6, 6) (dual of [(177150, 6), 1062882, 7]-NRT-code), using
- OA 3-folding and stacking [i] based on linear OA(8118, 531450, F81, 6) (dual of [531450, 531432, 7]-code), using
- discarding factors / shortening the dual code based on linear OA(8118, 531452, F81, 6) (dual of [531452, 531434, 7]-code), using
- construction X applied to Ce(5) ⊂ Ce(2) [i] based on
- linear OA(8116, 531441, F81, 6) (dual of [531441, 531425, 7]-code), using an extension Ce(5) of the primitive narrow-sense BCH-code C(I) with length 531440 = 813−1, defining interval I = [1,5], and designed minimum distance d ≥ |I|+1 = 6 [i]
- linear OA(817, 531441, F81, 3) (dual of [531441, 531434, 4]-code or 531441-cap in PG(6,81)), using an extension Ce(2) of the primitive narrow-sense BCH-code C(I) with length 531440 = 813−1, defining interval I = [1,2], and designed minimum distance d ≥ |I|+1 = 3 [i]
- linear OA(812, 11, F81, 2) (dual of [11, 9, 3]-code or 11-arc in PG(1,81)), using
- discarding factors / shortening the dual code based on linear OA(812, 81, F81, 2) (dual of [81, 79, 3]-code or 81-arc in PG(1,81)), using
- Reed–Solomon code RS(79,81) [i]
- discarding factors / shortening the dual code based on linear OA(812, 81, F81, 2) (dual of [81, 79, 3]-code or 81-arc in PG(1,81)), using
- construction X applied to Ce(5) ⊂ Ce(2) [i] based on
- discarding factors / shortening the dual code based on linear OA(8118, 531452, F81, 6) (dual of [531452, 531434, 7]-code), using
- OA 3-folding and stacking [i] based on linear OA(8118, 531450, F81, 6) (dual of [531450, 531432, 7]-code), using
(18−6, 18, 531452)-Net over F81 — Digital
Digital (12, 18, 531452)-net over F81, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OA(8118, 531452, F81, 6) (dual of [531452, 531434, 7]-code), using
- construction X applied to Ce(5) ⊂ Ce(2) [i] based on
- linear OA(8116, 531441, F81, 6) (dual of [531441, 531425, 7]-code), using an extension Ce(5) of the primitive narrow-sense BCH-code C(I) with length 531440 = 813−1, defining interval I = [1,5], and designed minimum distance d ≥ |I|+1 = 6 [i]
- linear OA(817, 531441, F81, 3) (dual of [531441, 531434, 4]-code or 531441-cap in PG(6,81)), using an extension Ce(2) of the primitive narrow-sense BCH-code C(I) with length 531440 = 813−1, defining interval I = [1,2], and designed minimum distance d ≥ |I|+1 = 3 [i]
- linear OA(812, 11, F81, 2) (dual of [11, 9, 3]-code or 11-arc in PG(1,81)), using
- discarding factors / shortening the dual code based on linear OA(812, 81, F81, 2) (dual of [81, 79, 3]-code or 81-arc in PG(1,81)), using
- Reed–Solomon code RS(79,81) [i]
- discarding factors / shortening the dual code based on linear OA(812, 81, F81, 2) (dual of [81, 79, 3]-code or 81-arc in PG(1,81)), using
- construction X applied to Ce(5) ⊂ Ce(2) [i] based on
(18−6, 18, large)-Net in Base 81 — Upper bound on s
There is no (12, 18, large)-net in base 81, because
- 4 times m-reduction [i] would yield (12, 14, large)-net in base 81, but