Best Known (23−5, 23, s)-Nets in Base 4
(23−5, 23, 8196)-Net over F4 — Constructive and digital
Digital (18, 23, 8196)-net over F4, using
- net defined by OOA [i] based on linear OOA(423, 8196, F4, 5, 5) (dual of [(8196, 5), 40957, 6]-NRT-code), using
- OOA 2-folding and stacking with additional row [i] based on linear OA(423, 16393, F4, 5) (dual of [16393, 16370, 6]-code), using
- construction X4 applied to Ce(4) ⊂ Ce(2) [i] based on
- linear OA(422, 16384, F4, 5) (dual of [16384, 16362, 6]-code), using an extension Ce(4) of the primitive narrow-sense BCH-code C(I) with length 16383 = 47−1, defining interval I = [1,4], and designed minimum distance d ≥ |I|+1 = 5 [i]
- linear OA(415, 16384, F4, 3) (dual of [16384, 16369, 4]-code or 16384-cap in PG(14,4)), using an extension Ce(2) of the primitive narrow-sense BCH-code C(I) with length 16383 = 47−1, defining interval I = [1,2], and designed minimum distance d ≥ |I|+1 = 3 [i]
- linear OA(48, 9, F4, 8) (dual of [9, 1, 9]-code or 9-arc in PG(7,4)), using
- dual of repetition code with length 9 [i]
- linear OA(41, 9, F4, 1) (dual of [9, 8, 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(4) ⊂ Ce(2) [i] based on
- OOA 2-folding and stacking with additional row [i] based on linear OA(423, 16393, F4, 5) (dual of [16393, 16370, 6]-code), using
(23−5, 23, 15752)-Net over F4 — Digital
Digital (18, 23, 15752)-net over F4, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OA(423, 15752, F4, 5) (dual of [15752, 15729, 6]-code), using
- discarding factors / shortening the dual code based on linear OA(423, 16392, F4, 5) (dual of [16392, 16369, 6]-code), using
- construction X applied to Ce(4) ⊂ Ce(2) [i] based on
- linear OA(422, 16384, F4, 5) (dual of [16384, 16362, 6]-code), using an extension Ce(4) of the primitive narrow-sense BCH-code C(I) with length 16383 = 47−1, defining interval I = [1,4], and designed minimum distance d ≥ |I|+1 = 5 [i]
- linear OA(415, 16384, F4, 3) (dual of [16384, 16369, 4]-code or 16384-cap in PG(14,4)), using an extension Ce(2) of the primitive narrow-sense BCH-code C(I) with length 16383 = 47−1, defining interval I = [1,2], and designed minimum distance d ≥ |I|+1 = 3 [i]
- linear OA(41, 8, F4, 1) (dual of [8, 7, 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(4) ⊂ Ce(2) [i] based on
- discarding factors / shortening the dual code based on linear OA(423, 16392, F4, 5) (dual of [16392, 16369, 6]-code), using
(23−5, 23, 1977212)-Net in Base 4 — Upper bound on s
There is no (18, 23, 1977213)-net in base 4, because
- 1 times m-reduction [i] would yield (18, 22, 1977213)-net in base 4, but
- the generalized Rao bound for nets shows that 4m ≥ 17 592191 373898 > 422 [i]