Best Known (197, 197+49, s)-Nets in Base 3
(197, 197+49, 688)-Net over F3 — Constructive and digital
Digital (197, 246, 688)-net over F3, using
- t-expansion [i] based on digital (193, 246, 688)-net over F3, using
- 2 times m-reduction [i] based on digital (193, 248, 688)-net over F3, using
- trace code for nets [i] based on digital (7, 62, 172)-net over F81, using
- net from sequence [i] based on digital (7, 171)-sequence over F81, using
- Niederreiter–Xing sequence construction II/III [i] based on function field F/F81 with g(F) = 7 and N(F) ≥ 172, using
- net from sequence [i] based on digital (7, 171)-sequence over F81, using
- trace code for nets [i] based on digital (7, 62, 172)-net over F81, using
- 2 times m-reduction [i] based on digital (193, 248, 688)-net over F3, using
(197, 197+49, 2637)-Net over F3 — Digital
Digital (197, 246, 2637)-net over F3, using
- embedding of OOA with Gilbert–Varšamov bound [i] based on linear OA(3246, 2637, F3, 49) (dual of [2637, 2391, 50]-code), using
- 428 step Varšamov–Edel lengthening with (ri) = (4, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 5 times 0, 1, 7 times 0, 1, 11 times 0, 1, 15 times 0, 1, 20 times 0, 1, 25 times 0, 1, 32 times 0, 1, 38 times 0, 1, 43 times 0, 1, 47 times 0, 1, 51 times 0, 1, 54 times 0, 1, 57 times 0) [i] based on linear OA(3225, 2188, F3, 49) (dual of [2188, 1963, 50]-code), using
- the expurgated narrow-sense BCH-code C(I) with length 2188 | 314−1, defining interval I = [0,24], and minimum distance d ≥ |{−24,−23,…,24}|+1 = 50 (BCH-bound) [i]
- 428 step Varšamov–Edel lengthening with (ri) = (4, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 5 times 0, 1, 7 times 0, 1, 11 times 0, 1, 15 times 0, 1, 20 times 0, 1, 25 times 0, 1, 32 times 0, 1, 38 times 0, 1, 43 times 0, 1, 47 times 0, 1, 51 times 0, 1, 54 times 0, 1, 57 times 0) [i] based on linear OA(3225, 2188, F3, 49) (dual of [2188, 1963, 50]-code), using
(197, 197+49, 363845)-Net in Base 3 — Upper bound on s
There is no (197, 246, 363846)-net in base 3, because
- 1 times m-reduction [i] would yield (197, 245, 363846)-net in base 3, but
- the generalized Rao bound for nets shows that 3m ≥ 784 711294 644331 521545 326296 473634 788973 693294 868475 427257 898587 917852 600216 401284 750158 389025 657580 906144 096399 024241 > 3245 [i]