Best Known (21, 21+19, s)-Nets in Base 81
(21, 21+19, 730)-Net over F81 — Constructive and digital
Digital (21, 40, 730)-net over F81, using
- net defined by OOA [i] based on linear OOA(8140, 730, F81, 19, 19) (dual of [(730, 19), 13830, 20]-NRT-code), using
- OOA 9-folding and stacking with additional row [i] based on linear OA(8140, 6571, F81, 19) (dual of [6571, 6531, 20]-code), using
- discarding factors / shortening the dual code based on linear OA(8140, 6573, F81, 19) (dual of [6573, 6533, 20]-code), using
- construction X applied to C([0,9]) ⊂ C([0,7]) [i] based on
- linear OA(8137, 6562, F81, 19) (dual of [6562, 6525, 20]-code), using the expurgated narrow-sense BCH-code C(I) with length 6562 | 814−1, defining interval I = [0,9], and minimum distance d ≥ |{−9,−8,…,9}|+1 = 20 (BCH-bound) [i]
- linear OA(8129, 6562, F81, 15) (dual of [6562, 6533, 16]-code), using the expurgated narrow-sense BCH-code C(I) with length 6562 | 814−1, defining interval I = [0,7], and minimum distance d ≥ |{−7,−6,…,7}|+1 = 16 (BCH-bound) [i]
- linear OA(813, 11, F81, 3) (dual of [11, 8, 4]-code or 11-arc in PG(2,81) or 11-cap in PG(2,81)), using
- discarding factors / shortening the dual code based on linear OA(813, 81, F81, 3) (dual of [81, 78, 4]-code or 81-arc in PG(2,81) or 81-cap in PG(2,81)), using
- Reed–Solomon code RS(78,81) [i]
- discarding factors / shortening the dual code based on linear OA(813, 81, F81, 3) (dual of [81, 78, 4]-code or 81-arc in PG(2,81) or 81-cap in PG(2,81)), using
- construction X applied to C([0,9]) ⊂ C([0,7]) [i] based on
- discarding factors / shortening the dual code based on linear OA(8140, 6573, F81, 19) (dual of [6573, 6533, 20]-code), using
- OOA 9-folding and stacking with additional row [i] based on linear OA(8140, 6571, F81, 19) (dual of [6571, 6531, 20]-code), using
(21, 21+19, 2891)-Net over F81 — Digital
Digital (21, 40, 2891)-net over F81, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OOA(8140, 2891, F81, 2, 19) (dual of [(2891, 2), 5742, 20]-NRT-code), using
- discarding factors / shortening the dual code based on linear OOA(8140, 3286, F81, 2, 19) (dual of [(3286, 2), 6532, 20]-NRT-code), using
- OOA 2-folding [i] based on linear OA(8140, 6572, F81, 19) (dual of [6572, 6532, 20]-code), using
- discarding factors / shortening the dual code based on linear OA(8140, 6573, F81, 19) (dual of [6573, 6533, 20]-code), using
- construction X applied to C([0,9]) ⊂ C([0,7]) [i] based on
- linear OA(8137, 6562, F81, 19) (dual of [6562, 6525, 20]-code), using the expurgated narrow-sense BCH-code C(I) with length 6562 | 814−1, defining interval I = [0,9], and minimum distance d ≥ |{−9,−8,…,9}|+1 = 20 (BCH-bound) [i]
- linear OA(8129, 6562, F81, 15) (dual of [6562, 6533, 16]-code), using the expurgated narrow-sense BCH-code C(I) with length 6562 | 814−1, defining interval I = [0,7], and minimum distance d ≥ |{−7,−6,…,7}|+1 = 16 (BCH-bound) [i]
- linear OA(813, 11, F81, 3) (dual of [11, 8, 4]-code or 11-arc in PG(2,81) or 11-cap in PG(2,81)), using
- discarding factors / shortening the dual code based on linear OA(813, 81, F81, 3) (dual of [81, 78, 4]-code or 81-arc in PG(2,81) or 81-cap in PG(2,81)), using
- Reed–Solomon code RS(78,81) [i]
- discarding factors / shortening the dual code based on linear OA(813, 81, F81, 3) (dual of [81, 78, 4]-code or 81-arc in PG(2,81) or 81-cap in PG(2,81)), using
- construction X applied to C([0,9]) ⊂ C([0,7]) [i] based on
- discarding factors / shortening the dual code based on linear OA(8140, 6573, F81, 19) (dual of [6573, 6533, 20]-code), using
- OOA 2-folding [i] based on linear OA(8140, 6572, F81, 19) (dual of [6572, 6532, 20]-code), using
- discarding factors / shortening the dual code based on linear OOA(8140, 3286, F81, 2, 19) (dual of [(3286, 2), 6532, 20]-NRT-code), using
(21, 21+19, large)-Net in Base 81 — Upper bound on s
There is no (21, 40, large)-net in base 81, because
- 17 times m-reduction [i] would yield (21, 23, large)-net in base 81, but