Best Known (248−16, 248, s)-Nets in Base 4
(248−16, 248, 4456450)-Net over F4 — Constructive and digital
Digital (232, 248, 4456450)-net over F4, using
- (u, u+v)-construction [i] based on
- digital (56, 64, 262150)-net over F4, using
- net defined by OOA [i] based on linear OOA(464, 262150, F4, 8, 8) (dual of [(262150, 8), 2097136, 9]-NRT-code), using
- OA 4-folding and stacking [i] based on linear OA(464, 1048600, F4, 8) (dual of [1048600, 1048536, 9]-code), using
- 2 times code embedding in larger space [i] based on linear OA(462, 1048598, F4, 8) (dual of [1048598, 1048536, 9]-code), using
- construction X4 applied to Ce(8) ⊂ Ce(5) [i] based on
- linear OA(461, 1048576, F4, 9) (dual of [1048576, 1048515, 10]-code), using an extension Ce(8) of the primitive narrow-sense BCH-code C(I) with length 1048575 = 410−1, defining interval I = [1,8], and designed minimum distance d ≥ |I|+1 = 9 [i]
- linear OA(441, 1048576, F4, 6) (dual of [1048576, 1048535, 7]-code), using an extension Ce(5) of the primitive narrow-sense BCH-code C(I) with length 1048575 = 410−1, defining interval I = [1,5], and designed minimum distance d ≥ |I|+1 = 6 [i]
- linear OA(421, 22, F4, 21) (dual of [22, 1, 22]-code or 22-arc in PG(20,4)), using
- dual of repetition code with length 22 [i]
- linear OA(41, 22, F4, 1) (dual of [22, 21, 2]-code), using
- discarding factors / shortening the dual code based on linear OA(41, s, F4, 1) (dual of [s, s−1, 2]-code) with arbitrarily large s, using
- construction X4 applied to Ce(8) ⊂ Ce(5) [i] based on
- 2 times code embedding in larger space [i] based on linear OA(462, 1048598, F4, 8) (dual of [1048598, 1048536, 9]-code), using
- OA 4-folding and stacking [i] based on linear OA(464, 1048600, F4, 8) (dual of [1048600, 1048536, 9]-code), using
- net defined by OOA [i] based on linear OOA(464, 262150, F4, 8, 8) (dual of [(262150, 8), 2097136, 9]-NRT-code), using
- digital (168, 184, 4194300)-net over F4, using
- trace code for nets [i] based on digital (76, 92, 2097150)-net over F16, using
- net defined by OOA [i] based on linear OOA(1692, 2097150, F16, 18, 16) (dual of [(2097150, 18), 37748608, 17]-NRT-code), using
- OOA 4-folding and stacking with additional row [i] based on linear OOA(1692, 8388601, F16, 2, 16) (dual of [(8388601, 2), 16777110, 17]-NRT-code), using
- discarding factors / shortening the dual code based on linear OOA(1692, 8388602, F16, 2, 16) (dual of [(8388602, 2), 16777112, 17]-NRT-code), using
- trace code [i] based on linear OOA(25646, 4194301, F256, 2, 16) (dual of [(4194301, 2), 8388556, 17]-NRT-code), using
- OOA 2-folding [i] based on linear OA(25646, 8388602, F256, 16) (dual of [8388602, 8388556, 17]-code), using
- discarding factors / shortening the dual code based on linear OA(25646, large, F256, 16) (dual of [large, large−46, 17]-code), using
- the primitive expurgated narrow-sense BCH-code C(I) with length 16777215 = 2563−1, defining interval I = [0,15], and designed minimum distance d ≥ |I|+1 = 17 [i]
- discarding factors / shortening the dual code based on linear OA(25646, large, F256, 16) (dual of [large, large−46, 17]-code), using
- OOA 2-folding [i] based on linear OA(25646, 8388602, F256, 16) (dual of [8388602, 8388556, 17]-code), using
- trace code [i] based on linear OOA(25646, 4194301, F256, 2, 16) (dual of [(4194301, 2), 8388556, 17]-NRT-code), using
- discarding factors / shortening the dual code based on linear OOA(1692, 8388602, F16, 2, 16) (dual of [(8388602, 2), 16777112, 17]-NRT-code), using
- OOA 4-folding and stacking with additional row [i] based on linear OOA(1692, 8388601, F16, 2, 16) (dual of [(8388601, 2), 16777110, 17]-NRT-code), using
- net defined by OOA [i] based on linear OOA(1692, 2097150, F16, 18, 16) (dual of [(2097150, 18), 37748608, 17]-NRT-code), using
- trace code for nets [i] based on digital (76, 92, 2097150)-net over F16, using
- digital (56, 64, 262150)-net over F4, using
(248−16, 248, large)-Net over F4 — Digital
Digital (232, 248, large)-net over F4, using
- t-expansion [i] based on digital (231, 248, large)-net over F4, using
- 9 times m-reduction [i] based on digital (231, 257, large)-net over F4, using
- embedding of OOA with Gilbert–VarÅ¡amov bound [i] based on linear OA(4257, large, F4, 26) (dual of [large, large−257, 27]-code), using
- 28 times code embedding in larger space [i] based on linear OA(4229, large, F4, 26) (dual of [large, large−229, 27]-code), using
- the primitive expurgated narrow-sense BCH-code C(I) with length 16777215 = 412−1, defining interval I = [0,25], and designed minimum distance d ≥ |I|+1 = 27 [i]
- 28 times code embedding in larger space [i] based on linear OA(4229, large, F4, 26) (dual of [large, large−229, 27]-code), using
- embedding of OOA with Gilbert–VarÅ¡amov bound [i] based on linear OA(4257, large, F4, 26) (dual of [large, large−257, 27]-code), using
- 9 times m-reduction [i] based on digital (231, 257, large)-net over F4, using
(248−16, 248, large)-Net in Base 4 — Upper bound on s
There is no (232, 248, large)-net in base 4, because
- 14 times m-reduction [i] would yield (232, 234, large)-net in base 4, but