Best Known (28, 28+21, s)-Nets in Base 64
(28, 28+21, 513)-Net over F64 — Constructive and digital
Digital (28, 49, 513)-net over F64, using
- net from sequence [i] based on digital (28, 512)-sequence over F64, using
- Niederreiter–Xing sequence construction II/III [i] based on function field F/F64 with g(F) = 28 and N(F) ≥ 513, using
- the Hermitian function field over F64 [i]
- Niederreiter–Xing sequence construction II/III [i] based on function field F/F64 with g(F) = 28 and N(F) ≥ 513, using
(28, 28+21, 1638)-Net in Base 64 — Constructive
(28, 49, 1638)-net in base 64, using
- base change [i] based on digital (21, 42, 1638)-net over F128, using
- 1281 times duplication [i] based on digital (20, 41, 1638)-net over F128, using
- net defined by OOA [i] based on linear OOA(12841, 1638, F128, 21, 21) (dual of [(1638, 21), 34357, 22]-NRT-code), using
- OOA 10-folding and stacking with additional row [i] based on linear OA(12841, 16381, F128, 21) (dual of [16381, 16340, 22]-code), using
- discarding factors / shortening the dual code based on linear OA(12841, 16384, F128, 21) (dual of [16384, 16343, 22]-code), using
- an extension Ce(20) of the primitive narrow-sense BCH-code C(I) with length 16383 = 1282−1, defining interval I = [1,20], and designed minimum distance d ≥ |I|+1 = 21 [i]
- discarding factors / shortening the dual code based on linear OA(12841, 16384, F128, 21) (dual of [16384, 16343, 22]-code), using
- OOA 10-folding and stacking with additional row [i] based on linear OA(12841, 16381, F128, 21) (dual of [16381, 16340, 22]-code), using
- net defined by OOA [i] based on linear OOA(12841, 1638, F128, 21, 21) (dual of [(1638, 21), 34357, 22]-NRT-code), using
- 1281 times duplication [i] based on digital (20, 41, 1638)-net over F128, using
(28, 28+21, 4318)-Net over F64 — Digital
Digital (28, 49, 4318)-net over F64, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OA(6449, 4318, F64, 21) (dual of [4318, 4269, 22]-code), using
- 212 step Varšamov–Edel lengthening with (ri) = (4, 0, 1, 4 times 0, 1, 16 times 0, 1, 49 times 0, 1, 137 times 0) [i] based on linear OA(6441, 4098, F64, 21) (dual of [4098, 4057, 22]-code), using
- construction X applied to Ce(20) ⊂ Ce(19) [i] based on
- linear OA(6441, 4096, F64, 21) (dual of [4096, 4055, 22]-code), using an extension Ce(20) of the primitive narrow-sense BCH-code C(I) with length 4095 = 642−1, defining interval I = [1,20], and designed minimum distance d ≥ |I|+1 = 21 [i]
- linear OA(6439, 4096, F64, 20) (dual of [4096, 4057, 21]-code), using an extension Ce(19) of the primitive narrow-sense BCH-code C(I) with length 4095 = 642−1, defining interval I = [1,19], and designed minimum distance d ≥ |I|+1 = 20 [i]
- linear OA(640, 2, F64, 0) (dual of [2, 2, 1]-code), using
- discarding factors / shortening the dual code based on linear OA(640, s, F64, 0) (dual of [s, s, 1]-code) with arbitrarily large s, using
- construction X applied to Ce(20) ⊂ Ce(19) [i] based on
- 212 step Varšamov–Edel lengthening with (ri) = (4, 0, 1, 4 times 0, 1, 16 times 0, 1, 49 times 0, 1, 137 times 0) [i] based on linear OA(6441, 4098, F64, 21) (dual of [4098, 4057, 22]-code), using
(28, 28+21, large)-Net in Base 64 — Upper bound on s
There is no (28, 49, large)-net in base 64, because
- 19 times m-reduction [i] would yield (28, 30, large)-net in base 64, but