Best Known (81−19, 81, s)-Nets in Base 64
(81−19, 81, 932067)-Net over F64 — Constructive and digital
Digital (62, 81, 932067)-net over F64, using
- 645 times duplication [i] based on digital (57, 76, 932067)-net over F64, using
- net defined by OOA [i] based on linear OOA(6476, 932067, F64, 21, 19) (dual of [(932067, 21), 19573331, 20]-NRT-code), using
- OOA 3-folding and stacking with additional row [i] based on linear OOA(6476, 2796202, F64, 3, 19) (dual of [(2796202, 3), 8388530, 20]-NRT-code), using
- 1 times NRT-code embedding in larger space [i] based on linear OOA(6473, 2796201, F64, 3, 19) (dual of [(2796201, 3), 8388530, 20]-NRT-code), using
- OOA 3-folding [i] based on linear OA(6473, large, F64, 19) (dual of [large, large−73, 20]-code), using
- the expurgated narrow-sense BCH-code C(I) with length 16777217 | 648−1, defining interval I = [0,9], and minimum distance d ≥ |{−9,−8,…,9}|+1 = 20 (BCH-bound) [i]
- OOA 3-folding [i] based on linear OA(6473, large, F64, 19) (dual of [large, large−73, 20]-code), using
- 1 times NRT-code embedding in larger space [i] based on linear OOA(6473, 2796201, F64, 3, 19) (dual of [(2796201, 3), 8388530, 20]-NRT-code), using
- OOA 3-folding and stacking with additional row [i] based on linear OOA(6476, 2796202, F64, 3, 19) (dual of [(2796202, 3), 8388530, 20]-NRT-code), using
- net defined by OOA [i] based on linear OOA(6476, 932067, F64, 21, 19) (dual of [(932067, 21), 19573331, 20]-NRT-code), using
(81−19, 81, large)-Net over F64 — Digital
Digital (62, 81, large)-net over F64, using
- 641 times duplication [i] based on digital (61, 80, large)-net over F64, using
- t-expansion [i] based on digital (60, 80, large)-net over F64, using
- embedding of OOA with Gilbert–VarÅ¡amov bound [i] based on linear OA(6480, large, F64, 20) (dual of [large, large−80, 21]-code), using
- 3 times code embedding in larger space [i] based on linear OA(6477, large, F64, 20) (dual of [large, large−77, 21]-code), using
- the primitive expurgated narrow-sense BCH-code C(I) with length 16777215 = 644−1, defining interval I = [0,19], and designed minimum distance d ≥ |I|+1 = 21 [i]
- 3 times code embedding in larger space [i] based on linear OA(6477, large, F64, 20) (dual of [large, large−77, 21]-code), using
- embedding of OOA with Gilbert–VarÅ¡amov bound [i] based on linear OA(6480, large, F64, 20) (dual of [large, large−80, 21]-code), using
- t-expansion [i] based on digital (60, 80, large)-net over F64, using
(81−19, 81, large)-Net in Base 64 — Upper bound on s
There is no (62, 81, large)-net in base 64, because
- 17 times m-reduction [i] would yield (62, 64, large)-net in base 64, but