Finite State Model and Compatibility Theory: New Analysis Tools for Permutation Networks

  • Authors:
  • Shing-Tsaan Huang;Satish K. Tripathi

  • Affiliations:
  • Tsing-Hua Univ., Hsin-Chu, Taiwan;Univ. of Maryland, College Park

  • Venue:
  • IEEE Transactions on Computers
  • Year:
  • 1986

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Abstract

In this paper, we present a new model, finite permutation machine (FPM), to describe the permutation networks. A set of theorems are developed to capture the theory of operations for the permutation networks. Using this new framework, an interesting problem is attacked: are 2n - 1 passes of shuffle exchange necessary and sufficient to realize all permutations? where n = log2 N and N is the number of inputs and outputs interconnected by the network. We prove that to realize all permutations, 2n - 1 passes of shuffle exchange are necessary and that 3n - 3 passes are sufficient. This reduces the sufficient number of passes by 2 from the best-known result.