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Notes on Shuffle/Exchange-Type Switching Networks

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1 Author(s)
Parker, D.S., Jr ; Department of Computer Science, University of California

In this paper a number of properties of Shuffle/Exchange networks are analyzed. A set of algebraic tools is developed and is used to prove that Lawrie's inverse Omega network, Pease's indirect binary n-cube array, and a network related to the 3-stage rearrangeable switching network studied by Clos and Beneš have identical switching capabilities. The approach used leads to a number of insights on the structure of the fast Fourier transform (FFT) algorithm. The inherent permuting power, or "universality," of the networks when used iteratively is then probed, leading to some nonintuitive results which have implications on the optimal control of Shuffle/Exchange-type networks for realizing permutations and broadcast connections.

Published in:

Computers, IEEE Transactions on  (Volume:C-29 ,  Issue: 3 )