Oversampled FIR and IIR DFT filter banks and Weyl-Heisenberg frames
AuthorsHelmut Bölcskei, Franz Hlawatsch, and Hans G. Feichtinger
ReferenceProc. of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Atlanta (GA), Vol. 3, pp. 1391-1394, May 1996.
AbstractWe apply the theory of Weyl-Heisenberg frames (WHFs) to oversampled FIR and IIR DFT filter banks (FBs). We show that the polyphase matrices provide a matrix representation of the frame operator, and we find conditions on a DFT FB to provide a WHF expansion. We also show that paraunitary and biorthogonal DFT FBs correspond to tight and exact WHFs, respectively, and that the frame bounds can be obtained by an eigenanalysis of the polyphase matrices. Simulation results demonstrate the importance of the frame bounds for the design of DFT FBs.
KeywordsOversampled DFT filter banks, FIR, IIR, frame-theory, frame bounds
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