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The Discrete Fourier Transform Over Finite Rings with Application to Fast Convolution

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2 Author(s)
Dubois, E. ; INRS Telecommunications ; Venetsanopoulos, A.N.

Necessary and sufficient conditions for a direct sum of local rings to support a generalized discrete Fourier transform are derived. In particular, these conditions can be applied to any finite ring. The function O(N) defined by Agarwal and Burrus for transforms over ZN is extended to any finite ring R as O(R) and it is shown that R supports a length m discrete Fourier transform if and only if m is a divisor of O(R) This result is applied to the homomorphic images of rings-of algebraic integers.

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Computers, IEEE Transactions on  (Volume:C-27 ,  Issue: 7 )