MinT - Best Known (146, 146+39, s)-Nets in Base 4

Best Known (146, 146+39, s)-Nets in Base 4

(146, 146+39, 1056)-Net over F₄ — Constructive and digital

Digital (146, 185, 1056)-net over F₄, using

4¹ times duplication [i] based on digital (145, 184, 1056)-net over F₄, using
- trace code for nets [i] based on digital (7, 46, 264)-net over F₂₅₆, using
  - net from sequence [i] based on digital (7, 263)-sequence over F₂₅₆, using
    - Niederreiter sequence [i]

(146, 146+39, 4360)-Net over F₄ — Digital

Digital (146, 185, 4360)-net over F₄, using

embedding of OOA with Gilbertâ€“VarÅ¡amov bound [i] based on linear OA(4¹⁸⁵, 4360, F₄, 39) (dual of [4360, 4175, 40]-code), using
- 248 step VarÅ¡amovâ€“Edel lengthening with (r_i)Â = (3, 1, 0, 0, 1, 5 times 0, 1, 12 times 0, 1, 23 times 0, 1, 40 times 0, 1, 65 times 0, 1, 93 times 0) [i] based on linear OA(4¹⁷⁵, 4102, F₄, 39) (dual of [4102, 3927, 40]-code), using
  - constructionÂ X applied to C_e(38) âŠ‚ C_e(37) [i] based on
    1. linear OA(4¹⁷⁵, 4096, F₄, 39) (dual of [4096, 3921, 40]-code), using an extension C_e(38) of the primitive narrow-sense BCH-code C(I) with length 4095Â = 4⁶âˆ’1, defining interval IÂ =Â [1,38], and designed minimum distance dÂ â‰¥Â |I|+1Â =Â 39 [i]
    2. linear OA(4¹⁶⁹, 4096, F₄, 38) (dual of [4096, 3927, 39]-code), using an extension C_e(37) of the primitive narrow-sense BCH-code C(I) with length 4095Â = 4⁶âˆ’1, defining interval IÂ =Â [1,37], and designed minimum distance dÂ â‰¥Â |I|+1Â =Â 38 [i]
    3. linear OA(4⁰, 6, F₄, 0) (dual of [6, 6, 1]-code), using
      - discarding factors / shortening the dual code based on linear OA(4⁰, s, F₄, 0) (dual of [s, s, 1]-code) with arbitrarily large s, using
        OA with only one run / dual of code without redundancy [i]

(146, 146+39, 1788818)-Net in Base 4 — Upper bound on s

There is no (146, 185, 1788819)-net in base 4, because

1 times m-reduction [i] would yield (146, 184, 1788819)-net in base 4, but
- the generalized Rao bound for nets shows that 4^mÂ â‰¥ 601 231230 529869 437903 293668 325926 732579 802794 641418 398860 225581 719886 545193 184087 026964 859497 833704 729863 770988 > 4¹⁸⁴ [i]