Best Known (221, 221+20, s)-Nets in Base 4
(221, 221+20, 3355440)-Net over F4 — Constructive and digital
Digital (221, 241, 3355440)-net over F4, using
- 49 times duplication [i] based on digital (212, 232, 3355440)-net over F4, using
- trace code for nets [i] based on digital (96, 116, 1677720)-net over F16, using
- net defined by OOA [i] based on linear OOA(16116, 1677720, F16, 22, 20) (dual of [(1677720, 22), 36909724, 21]-NRT-code), using
- OOA 5-folding and stacking with additional row [i] based on linear OOA(16116, 8388601, F16, 2, 20) (dual of [(8388601, 2), 16777086, 21]-NRT-code), using
- discarding factors / shortening the dual code based on linear OOA(16116, 8388602, F16, 2, 20) (dual of [(8388602, 2), 16777088, 21]-NRT-code), using
- trace code [i] based on linear OOA(25658, 4194301, F256, 2, 20) (dual of [(4194301, 2), 8388544, 21]-NRT-code), using
- OOA 2-folding [i] based on linear OA(25658, 8388602, F256, 20) (dual of [8388602, 8388544, 21]-code), using
- discarding factors / shortening the dual code based on linear OA(25658, large, F256, 20) (dual of [large, large−58, 21]-code), using
- the primitive expurgated narrow-sense BCH-code C(I) with length 16777215 = 2563−1, defining interval I = [0,19], and designed minimum distance d ≥ |I|+1 = 21 [i]
- discarding factors / shortening the dual code based on linear OA(25658, large, F256, 20) (dual of [large, large−58, 21]-code), using
- OOA 2-folding [i] based on linear OA(25658, 8388602, F256, 20) (dual of [8388602, 8388544, 21]-code), using
- trace code [i] based on linear OOA(25658, 4194301, F256, 2, 20) (dual of [(4194301, 2), 8388544, 21]-NRT-code), using
- discarding factors / shortening the dual code based on linear OOA(16116, 8388602, F16, 2, 20) (dual of [(8388602, 2), 16777088, 21]-NRT-code), using
- OOA 5-folding and stacking with additional row [i] based on linear OOA(16116, 8388601, F16, 2, 20) (dual of [(8388601, 2), 16777086, 21]-NRT-code), using
- net defined by OOA [i] based on linear OOA(16116, 1677720, F16, 22, 20) (dual of [(1677720, 22), 36909724, 21]-NRT-code), using
- trace code for nets [i] based on digital (96, 116, 1677720)-net over F16, using
(221, 221+20, large)-Net over F4 — Digital
Digital (221, 241, large)-net over F4, using
- 44 times duplication [i] based on digital (217, 237, large)-net over F4, using
- t-expansion [i] based on digital (213, 237, large)-net over F4, using
- embedding of OOA with Gilbert–VarÅ¡amov bound [i] based on linear OA(4237, large, F4, 24) (dual of [large, large−237, 25]-code), using
- 21 times code embedding in larger space [i] based on linear OA(4216, large, F4, 24) (dual of [large, large−216, 25]-code), using
- the primitive narrow-sense BCH-code C(I) with length 16777215 = 412−1, defining interval I = [1,24], and designed minimum distance d ≥ |I|+1 = 25 [i]
- 21 times code embedding in larger space [i] based on linear OA(4216, large, F4, 24) (dual of [large, large−216, 25]-code), using
- embedding of OOA with Gilbert–VarÅ¡amov bound [i] based on linear OA(4237, large, F4, 24) (dual of [large, large−237, 25]-code), using
- t-expansion [i] based on digital (213, 237, large)-net over F4, using
(221, 221+20, large)-Net in Base 4 — Upper bound on s
There is no (221, 241, large)-net in base 4, because
- 18 times m-reduction [i] would yield (221, 223, large)-net in base 4, but