Best Known (25, 25+7, s)-Nets in Base 81
(25, 25+7, 5592401)-Net over F81 — Constructive and digital
Digital (25, 32, 5592401)-net over F81, using
- net defined by OOA [i] based on linear OOA(8132, 5592401, F81, 9, 7) (dual of [(5592401, 9), 50331577, 8]-NRT-code), using
- OOA stacking with additional row [i] based on linear OOA(8132, 5592402, F81, 3, 7) (dual of [(5592402, 3), 16777174, 8]-NRT-code), using
- (u, u+v)-construction [i] based on
- linear OOA(817, large, F81, 3, 3), using
- appending kth column [i] based on linear OOA(817, large, F81, 2, 3), using
- OAs with strength 3, b ≠ 2, and m > 3 are always embeddable [i] based on linear OA(817, large, F81, 3) (dual of [large, large−7, 4]-code), using
- appending kth column [i] based on linear OOA(817, large, F81, 2, 3), using
- linear OOA(8125, 2796201, F81, 3, 7) (dual of [(2796201, 3), 8388578, 8]-NRT-code), using
- OOA 3-folding [i] based on linear OA(8125, large, F81, 7) (dual of [large, large−25, 8]-code), using
- the expurgated narrow-sense BCH-code C(I) with length 21523361 | 818−1, defining interval I = [0,3], and minimum distance d ≥ |{−3,−2,…,3}|+1 = 8 (BCH-bound) [i]
- OOA 3-folding [i] based on linear OA(8125, large, F81, 7) (dual of [large, large−25, 8]-code), using
- linear OOA(817, large, F81, 3, 3), using
- (u, u+v)-construction [i] based on
- OOA stacking with additional row [i] based on linear OOA(8132, 5592402, F81, 3, 7) (dual of [(5592402, 3), 16777174, 8]-NRT-code), using
(25, 25+7, large)-Net over F81 — Digital
Digital (25, 32, large)-net over F81, using
- t-expansion [i] based on digital (24, 32, large)-net over F81, using
- 1 times m-reduction [i] based on digital (24, 33, large)-net over F81, using
- embedding of OOA with Gilbert–VarÅ¡amov bound [i] based on linear OA(8133, large, F81, 9) (dual of [large, large−33, 10]-code), using
- the expurgated narrow-sense BCH-code C(I) with length 21523361 | 818−1, defining interval I = [0,4], and minimum distance d ≥ |{−4,−3,…,4}|+1 = 10 (BCH-bound) [i]
- embedding of OOA with Gilbert–VarÅ¡amov bound [i] based on linear OA(8133, large, F81, 9) (dual of [large, large−33, 10]-code), using
- 1 times m-reduction [i] based on digital (24, 33, large)-net over F81, using
(25, 25+7, large)-Net in Base 81 — Upper bound on s
There is no (25, 32, large)-net in base 81, because
- 5 times m-reduction [i] would yield (25, 27, large)-net in base 81, but