MinT - Best Known (169−128, 169, s)-Nets in Base 4

Best Known (169−128, 169, s)-Nets in Base 4

(169−128, 169, 56)-Net over F₄ — Constructive and digital

Digital (41, 169, 56)-net over F₄, using

t-expansion [i] based on digital (33, 169, 56)-net over F₄, using
- net from sequence [i] based on digital (33, 55)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 33 and N(F) ≥ 56, using
    - F₅ from the tower of function fields by GarcÃa and Stichtenoth over F₄ [i]

(169−128, 169, 75)-Net over F₄ — Digital

Digital (41, 169, 75)-net over F₄, using

t-expansion [i] based on digital (40, 169, 75)-net over F₄, using
- net from sequence [i] based on digital (40, 74)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 40 and N(F) ≥ 75, using
    - Drinfeld modules of rank 1 [i]

(169−128, 169, 172)-Net over F₄ — Upper bound on s (digital)

There is no digital (41, 169, 173)-net over F₄, because

extracting embedded orthogonal array [i] would yield linear OA(4¹⁶⁹, 173, F₄, 128) (dual of [173, 4, 129]-code), but
- Griesmer bound [i]

(169−128, 169, 270)-Net in Base 4 — Upper bound on s

There is no (41, 169, 271)-net in base 4, because

the generalized Rao bound for nets shows that 4^mÂ â‰¥ 673830 935742 327598 578811 736750 714230 333901 862515 481330 638388 080207 031747 664825 180179 754677 769250 266876 > 4¹⁶⁹ [i]