Article,

Eigenvalue and Eigenvector Decomposition of the Discrete Fourier Transform

, and .
Audio and Electroacoustics, IEEE Transactions on, 20 (1): 66--74 (March 1972)
DOI: 10.1109/TAU.1972.1162342

Abstract

The principal results of this paper are listed as follows. 1) The eigenvalues of a suitably normalized version of the discrete Fourier transform (DFT) are <img src="/images/tex/14891.gif" alt="1, -1,j, -j"> . 2) An eigenvector basis is constructed for the DFT. 3) The multiplicities of the eigenvalues are summarized for an N&#215;N transform as follows.

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