Best Known (49, 49+25, s)-Nets in Base 27
(49, 49+25, 1640)-Net over F27 — Constructive and digital
Digital (49, 74, 1640)-net over F27, using
- 271 times duplication [i] based on digital (48, 73, 1640)-net over F27, using
- net defined by OOA [i] based on linear OOA(2773, 1640, F27, 25, 25) (dual of [(1640, 25), 40927, 26]-NRT-code), using
- OOA 12-folding and stacking with additional row [i] based on linear OA(2773, 19681, F27, 25) (dual of [19681, 19608, 26]-code), using
- discarding factors / shortening the dual code based on linear OA(2773, 19683, F27, 25) (dual of [19683, 19610, 26]-code), using
- an extension Ce(24) of the primitive narrow-sense BCH-code C(I) with length 19682 = 273−1, defining interval I = [1,24], and designed minimum distance d ≥ |I|+1 = 25 [i]
- discarding factors / shortening the dual code based on linear OA(2773, 19683, F27, 25) (dual of [19683, 19610, 26]-code), using
- OOA 12-folding and stacking with additional row [i] based on linear OA(2773, 19681, F27, 25) (dual of [19681, 19608, 26]-code), using
- net defined by OOA [i] based on linear OOA(2773, 1640, F27, 25, 25) (dual of [(1640, 25), 40927, 26]-NRT-code), using
(49, 49+25, 12651)-Net over F27 — Digital
Digital (49, 74, 12651)-net over F27, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OA(2774, 12651, F27, 25) (dual of [12651, 12577, 26]-code), using
- discarding factors / shortening the dual code based on linear OA(2774, 19691, F27, 25) (dual of [19691, 19617, 26]-code), using
- construction X applied to C([0,12]) ⊂ C([0,11]) [i] based on
- linear OA(2773, 19684, F27, 25) (dual of [19684, 19611, 26]-code), using the expurgated narrow-sense BCH-code C(I) with length 19684 | 276−1, defining interval I = [0,12], and minimum distance d ≥ |{−12,−11,…,12}|+1 = 26 (BCH-bound) [i]
- linear OA(2767, 19684, F27, 23) (dual of [19684, 19617, 24]-code), using the expurgated narrow-sense BCH-code C(I) with length 19684 | 276−1, defining interval I = [0,11], and minimum distance d ≥ |{−11,−10,…,11}|+1 = 24 (BCH-bound) [i]
- linear OA(271, 7, F27, 1) (dual of [7, 6, 2]-code), using
- discarding factors / shortening the dual code based on linear OA(271, s, F27, 1) (dual of [s, s−1, 2]-code) with arbitrarily large s, using
- construction X applied to C([0,12]) ⊂ C([0,11]) [i] based on
- discarding factors / shortening the dual code based on linear OA(2774, 19691, F27, 25) (dual of [19691, 19617, 26]-code), using
(49, 49+25, large)-Net in Base 27 — Upper bound on s
There is no (49, 74, large)-net in base 27, because
- 23 times m-reduction [i] would yield (49, 51, large)-net in base 27, but