Best Known (231, 247, s)-Nets in Base 4
(231, 247, 4456449)-Net over F4 — Constructive and digital
Digital (231, 247, 4456449)-net over F4, using
- 41 times duplication [i] based on digital (230, 246, 4456449)-net over F4, using
- (u, u+v)-construction [i] based on
- digital (54, 62, 262149)-net over F4, using
- net defined by OOA [i] based on linear OOA(462, 262149, F4, 8, 8) (dual of [(262149, 8), 2097130, 9]-NRT-code), using
- OA 4-folding and stacking [i] based on linear OA(462, 1048596, F4, 8) (dual of [1048596, 1048534, 9]-code), using
- discarding factors / shortening the dual code based on linear OA(462, 1048597, F4, 8) (dual of [1048597, 1048535, 9]-code), using
- construction X 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(41, 21, F4, 1) (dual of [21, 20, 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 X applied to Ce(8) ⊂ Ce(5) [i] based on
- discarding factors / shortening the dual code based on linear OA(462, 1048597, F4, 8) (dual of [1048597, 1048535, 9]-code), using
- OA 4-folding and stacking [i] based on linear OA(462, 1048596, F4, 8) (dual of [1048596, 1048534, 9]-code), using
- net defined by OOA [i] based on linear OOA(462, 262149, F4, 8, 8) (dual of [(262149, 8), 2097130, 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 (54, 62, 262149)-net over F4, using
- (u, u+v)-construction [i] based on
(231, 247, large)-Net over F4 — Digital
Digital (231, 247, large)-net over F4, using
- 10 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
(231, 247, large)-Net in Base 4 — Upper bound on s
There is no (231, 247, large)-net in base 4, because
- 14 times m-reduction [i] would yield (231, 233, large)-net in base 4, but