Best Known (7, 7+6, s)-Nets in Base 81
(7, 7+6, 2189)-Net over F81 — Constructive and digital
Digital (7, 13, 2189)-net over F81, using
- net defined by OOA [i] based on linear OOA(8113, 2189, F81, 6, 6) (dual of [(2189, 6), 13121, 7]-NRT-code), using
- OA 3-folding and stacking [i] based on linear OA(8113, 6567, F81, 6) (dual of [6567, 6554, 7]-code), using
- discarding factors / shortening the dual code based on linear OA(8113, 6569, F81, 6) (dual of [6569, 6556, 7]-code), using
- construction X applied to Ce(5) ⊂ Ce(2) [i] based on
- linear OA(8111, 6561, F81, 6) (dual of [6561, 6550, 7]-code), using an extension Ce(5) of the primitive narrow-sense BCH-code C(I) with length 6560 = 812−1, defining interval I = [1,5], and designed minimum distance d ≥ |I|+1 = 6 [i]
- linear OA(815, 6561, F81, 3) (dual of [6561, 6556, 4]-code or 6561-cap in PG(4,81)), using an extension Ce(2) of the primitive narrow-sense BCH-code C(I) with length 6560 = 812−1, defining interval I = [1,2], and designed minimum distance d ≥ |I|+1 = 3 [i]
- linear OA(812, 8, F81, 2) (dual of [8, 6, 3]-code or 8-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(8113, 6569, F81, 6) (dual of [6569, 6556, 7]-code), using
- OA 3-folding and stacking [i] based on linear OA(8113, 6567, F81, 6) (dual of [6567, 6554, 7]-code), using
(7, 7+6, 6569)-Net over F81 — Digital
Digital (7, 13, 6569)-net over F81, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OA(8113, 6569, F81, 6) (dual of [6569, 6556, 7]-code), using
- construction X applied to Ce(5) ⊂ Ce(2) [i] based on
- linear OA(8111, 6561, F81, 6) (dual of [6561, 6550, 7]-code), using an extension Ce(5) of the primitive narrow-sense BCH-code C(I) with length 6560 = 812−1, defining interval I = [1,5], and designed minimum distance d ≥ |I|+1 = 6 [i]
- linear OA(815, 6561, F81, 3) (dual of [6561, 6556, 4]-code or 6561-cap in PG(4,81)), using an extension Ce(2) of the primitive narrow-sense BCH-code C(I) with length 6560 = 812−1, defining interval I = [1,2], and designed minimum distance d ≥ |I|+1 = 3 [i]
- linear OA(812, 8, F81, 2) (dual of [8, 6, 3]-code or 8-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
(7, 7+6, 4230536)-Net in Base 81 — Upper bound on s
There is no (7, 13, 4230537)-net in base 81, because
- the generalized Rao bound for nets shows that 81m ≥ 6 461086 022592 743283 994481 > 8113 [i]