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Semi-cyclic holey group divisible designs with block size three

机译:块大小为3的半循环多孔群可分割设计

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In this paper we discuss the existence problem for a semi-cyclic holey group divisible design of type (n, m~t) with block size 3, which is denoted by a 3-SCHGDD of type (n, m~t). When n = 3, a 3-SCHGDD of type (3, m~t) is equivalent to a (3, mt; m)-cyclic holey difference matrix, denoted by a (3, mt; m)-CHDM. It is shown that there is a (3, mt; m)-CHDM if and only if (t -1)m ≡ 0 (mod 2) and t ≥ 3 with the exception of m ≡ 0 (mod 2) and t = 3. When n ≥ 4, the case of t odd is considered. It is established that if t ≡ 1 (mod 2) and n ≥ 4, then there exists a 3-SCHGDD of type (n, m~t) if and only if t ≥ 3 and (t - 1)n(n - 1)m ≡ 0 (mod 6) with some possible exceptions of n = 6 and 8. The main results in this paper have been used to construct optimal two-dimensional optical orthogonal codes with weight 3 and different auto- and cross-correlation constraints by the authors recently.
机译:在本文中,我们讨论了块大小为3的类型为(n,m〜t)的半周期孔组可分式设计的存在问题,该问题由类型为(n,m〜t)的3-SCHGDD表示。当n = 3时,类型为(3,m〜t)的3-SCHGDD等效于由(3,mt; m)-CHDM表示的(3,mt; m)循环有孔差矩阵。结果表明,当且仅当(t -1)m≡0(mod 2)且t≥3时存在一个(3,mt; m)-CHDM,m≡0(mod 2)和t = 3.当n≥4时,考虑t奇数的情况。可以确定的是,如果t≡1(mod 2)且n≥4,则当且仅当t≥3并且(t-1)n(n- 1)m≡0(mod 6),n = 6和8可能有一些例外。本文的主要结果已用于构建权重为3且具有不同自相关和互相关约束的最佳二维光学正交码由作者最近。

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