MinT - Best Known (230−168, 230, s)-Nets in Base 4

Best Known (230−168, 230, s)-Nets in Base 4

Digital (62, 230, 66)-net over F₄, using

t-expansion [i] based on digital (49, 230, 66)-net over F₄, using
- net from sequence [i] based on digital (49, 65)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 49 and N(F) ≥ 66, using
    - T₆ from the second tower of function fields by GarcÃa and Stichtenoth over F₄ [i]

Digital (62, 230, 99)-net over F₄, using

t-expansion [i] based on digital (61, 230, 99)-net over F₄, using
- net from sequence [i] based on digital (61, 98)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 61 and N(F) ≥ 99, using
    - Drinfeld modules of rank 1 [i]

There is no digital (62, 230, 319)-net over F₄, because

extracting embedded orthogonal array [i] would yield linear OA(4²³⁰, 319, F₄, 168) (dual of [319, 89, 169]-code), but
- residual code [i] would yield OA(4⁶², 150, S₄, 42), but
  - the linear programming bound shows that MÂ â‰¥ 1 659762 510567 225532 778073 956682 851160 927584 506340 544111 988906 878425 443399 317508 383360 785706 508045 270473 316579 147776 / 70196 277944 430470 237066 876146 512897 904291 630830 313677 137903 195390 483423 677609 > 4⁶² [i]

There is no (62, 230, 411)-net in base 4, because

the generalized Rao bound for nets shows that 4^mÂ â‰¥ 3 517792 474860 944035 044016 315388 695843 619349 024476 293249 136735 370829 565343 261588 193314 392765 614047 913620 083853 899336 218569 808975 370751 544060 > 4²³⁰ [i]