Best Known (18−9, 18, s)-Nets in Base 64
(18−9, 18, 1025)-Net over F64 — Constructive and digital
Digital (9, 18, 1025)-net over F64, using
- net defined by OOA [i] based on linear OOA(6418, 1025, F64, 9, 9) (dual of [(1025, 9), 9207, 10]-NRT-code), using
- OOA 4-folding and stacking with additional row [i] based on linear OA(6418, 4101, F64, 9) (dual of [4101, 4083, 10]-code), using
- discarding factors / shortening the dual code based on linear OA(6418, 4102, F64, 9) (dual of [4102, 4084, 10]-code), using
- construction X applied to C([0,4]) ⊂ C([0,3]) [i] based on
- linear OA(6417, 4097, F64, 9) (dual of [4097, 4080, 10]-code), using the expurgated narrow-sense BCH-code C(I) with length 4097 | 644−1, defining interval I = [0,4], and minimum distance d ≥ |{−4,−3,…,4}|+1 = 10 (BCH-bound) [i]
- linear OA(6413, 4097, F64, 7) (dual of [4097, 4084, 8]-code), using the expurgated narrow-sense BCH-code C(I) with length 4097 | 644−1, defining interval I = [0,3], and minimum distance d ≥ |{−3,−2,…,3}|+1 = 8 (BCH-bound) [i]
- linear OA(641, 5, F64, 1) (dual of [5, 4, 2]-code), using
- discarding factors / shortening the dual code based on linear OA(641, s, F64, 1) (dual of [s, s−1, 2]-code) with arbitrarily large s, using
- construction X applied to C([0,4]) ⊂ C([0,3]) [i] based on
- discarding factors / shortening the dual code based on linear OA(6418, 4102, F64, 9) (dual of [4102, 4084, 10]-code), using
- OOA 4-folding and stacking with additional row [i] based on linear OA(6418, 4101, F64, 9) (dual of [4101, 4083, 10]-code), using
(18−9, 18, 2051)-Net over F64 — Digital
Digital (9, 18, 2051)-net over F64, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OOA(6418, 2051, F64, 2, 9) (dual of [(2051, 2), 4084, 10]-NRT-code), using
- OOA 2-folding [i] based on linear OA(6418, 4102, F64, 9) (dual of [4102, 4084, 10]-code), using
- construction X applied to C([0,4]) ⊂ C([0,3]) [i] based on
- linear OA(6417, 4097, F64, 9) (dual of [4097, 4080, 10]-code), using the expurgated narrow-sense BCH-code C(I) with length 4097 | 644−1, defining interval I = [0,4], and minimum distance d ≥ |{−4,−3,…,4}|+1 = 10 (BCH-bound) [i]
- linear OA(6413, 4097, F64, 7) (dual of [4097, 4084, 8]-code), using the expurgated narrow-sense BCH-code C(I) with length 4097 | 644−1, defining interval I = [0,3], and minimum distance d ≥ |{−3,−2,…,3}|+1 = 8 (BCH-bound) [i]
- linear OA(641, 5, F64, 1) (dual of [5, 4, 2]-code), using
- discarding factors / shortening the dual code based on linear OA(641, s, F64, 1) (dual of [s, s−1, 2]-code) with arbitrarily large s, using
- construction X applied to C([0,4]) ⊂ C([0,3]) [i] based on
- OOA 2-folding [i] based on linear OA(6418, 4102, F64, 9) (dual of [4102, 4084, 10]-code), using
(18−9, 18, 1667157)-Net in Base 64 — Upper bound on s
There is no (9, 18, 1667158)-net in base 64, because
- 1 times m-reduction [i] would yield (9, 17, 1667158)-net in base 64, but
- the generalized Rao bound for nets shows that 64m ≥ 5 070603 224972 958288 029073 671761 > 6417 [i]