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On implementation and design of filter banks for subband adaptive systems

Weiss, Stephan and Harteneck, Moritz and Stewart, Robert (1998) On implementation and design of filter banks for subband adaptive systems. In: IEEE Workshop on Signal Processing Systems, 1998-10-08 - 1998-10-10, Boston, MA.

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We introduce a polyphase implementation and design of an oversampled K-channel generalized DFT (GDFT) filter bank, which can be employed for subband adaptive filtering, and therefore is required to have a low aliasing level in the subband signals. A polyphase structure is derived which can be factorized into a real-valued polyphase network and a GDFT modulation. For the latter, an FFT realization may be used, yielding a very inexpensive polyphase implementation for arbitrary integer decimation ratios N les;K. We also present an analysis underlining the efficiency of complex-valued subband processing. The design of the filter bank is completely based on the prototype filter and solved using a fast converging iterative least squares method, for which we give examples, The design specifications closely correspond with performance limits of subband adaptive filtering, which are underpinned by simulation results.