Issue No.05 - May (1995 vol.44)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/12.381960
<p><it>Abstract</it>—An <it>N</it>×<it>N k</it>-Omega network is obtained by adding <it>k</it> more stages in front of an Omega network. An <it>N</it>-permutation defines a bijection between the set of <it>N</it> sources and the set of <it>N</it> destinations. Such a permutation is said to be admissible to a <it>k</it>-Omega if <it>N</it> conflict-free paths, one for each source-destination pair defined by the permutation, can be established simultaneously. When an <it>N</it>-permutation is not admissible, it is desirable to divide the <it>N</it> pairs into a minimum number of groups (passes) such that the conflict-free paths can be established for the pairs in each group. Raghavendra and Varma solved this problem for BPC (<it>Bit Permutation Complement</it>) permutations on an Omega without extra stage. This paper generalizes their result to a <it>k</it>-Omega where <it>k</it> can be any integer between 0 and <it>n</it> 1. An <it>O</it>(<it>NlgN</it>) algorithm is given which realizes any BPC permutation in a minimum number of passes on a <it>k</it>-Omega (0 ≤<it>k</it>≤<it>n</it> 1).</p>
BPC permutation, conflict graph, graph coloring, k-Omega network, permutation realization.
Xiaojun Shen, "Optimal Realization of Any BPC Permutation on K-Extra-Stage Omega Networks", IEEE Transactions on Computers, vol.44, no. 5, pp. 714-719, May 1995, doi:10.1109/12.381960