Best Known (181, 220, s)-Nets in Base 2
(181, 220, 380)-Net over F2 — Constructive and digital
Digital (181, 220, 380)-net over F2, using
- trace code for nets [i] based on digital (5, 44, 76)-net over F32, using
- net from sequence [i] based on digital (5, 75)-sequence over F32, using
- Niederreiter–Xing sequence construction II/III [i] based on function field F/F32 with g(F) = 5 and N(F) ≥ 76, using
- net from sequence [i] based on digital (5, 75)-sequence over F32, using
(181, 220, 898)-Net over F2 — Digital
Digital (181, 220, 898)-net over F2, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OOA(2220, 898, F2, 2, 39) (dual of [(898, 2), 1576, 40]-NRT-code), using
- discarding factors / shortening the dual code based on linear OOA(2220, 1040, F2, 2, 39) (dual of [(1040, 2), 1860, 40]-NRT-code), using
- 2 times NRT-code embedding in larger space [i] based on linear OOA(2216, 1038, F2, 2, 39) (dual of [(1038, 2), 1860, 40]-NRT-code), using
- OOA 2-folding [i] based on linear OA(2216, 2076, F2, 39) (dual of [2076, 1860, 40]-code), using
- construction X applied to Ce(38) ⊂ Ce(34) [i] based on
- linear OA(2210, 2048, F2, 39) (dual of [2048, 1838, 40]-code), using an extension Ce(38) of the primitive narrow-sense BCH-code C(I) with length 2047 = 211−1, defining interval I = [1,38], and designed minimum distance d ≥ |I|+1 = 39 [i]
- linear OA(2188, 2048, F2, 35) (dual of [2048, 1860, 36]-code), using an extension Ce(34) of the primitive narrow-sense BCH-code C(I) with length 2047 = 211−1, defining interval I = [1,34], and designed minimum distance d ≥ |I|+1 = 35 [i]
- linear OA(26, 28, F2, 3) (dual of [28, 22, 4]-code or 28-cap in PG(5,2)), using
- discarding factors / shortening the dual code based on linear OA(26, 32, F2, 3) (dual of [32, 26, 4]-code or 32-cap in PG(5,2)), using
- construction X applied to Ce(38) ⊂ Ce(34) [i] based on
- OOA 2-folding [i] based on linear OA(2216, 2076, F2, 39) (dual of [2076, 1860, 40]-code), using
- 2 times NRT-code embedding in larger space [i] based on linear OOA(2216, 1038, F2, 2, 39) (dual of [(1038, 2), 1860, 40]-NRT-code), using
- discarding factors / shortening the dual code based on linear OOA(2220, 1040, F2, 2, 39) (dual of [(1040, 2), 1860, 40]-NRT-code), using
(181, 220, 23359)-Net in Base 2 — Upper bound on s
There is no (181, 220, 23360)-net in base 2, because
- 1 times m-reduction [i] would yield (181, 219, 23360)-net in base 2, but
- the generalized Rao bound for nets shows that 2m ≥ 842885 562934 006767 461145 771177 557063 492884 348040 770937 548865 067045 > 2219 [i]