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Design and Efficient Implementation of Oversampled GDFT Filter Banks for Subband Adaptive Filtering

Design and Efficient Implementation of Oversampled GDFT Filter Banks for Subband Adaptive Filtering
Design and Efficient Implementation of Oversampled GDFT Filter Banks for Subband Adaptive Filtering
This paper introduces 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 highly efficient polyphase implementation for arbitrary integer decimation ratios N <= 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 under-pinned by simulation results.
12/1-12/8
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Harteneck, M
9b15e378-31d8-4e37-8042-5e386a292a4a
Stewart, R W
c819965d-70b4-4689-8206-e6e444dcbf8e
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Harteneck, M
9b15e378-31d8-4e37-8042-5e386a292a4a
Stewart, R W
c819965d-70b4-4689-8206-e6e444dcbf8e

Weiss, S, Harteneck, M and Stewart, R W (1998) Design and Efficient Implementation of Oversampled GDFT Filter Banks for Subband Adaptive Filtering. Colloquium on Digital Filters: an Enabling Technology. 12/1-12/8 .

Record type: Conference or Workshop Item (Other)

Abstract

This paper introduces 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 highly efficient polyphase implementation for arbitrary integer decimation ratios N <= 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 under-pinned by simulation results.

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More information

Published date: April 1998
Additional Information: Organisation: IEE Address: London, UK
Venue - Dates: Colloquium on Digital Filters: an Enabling Technology, 1998-03-31
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 251914
URI: http://eprints.soton.ac.uk/id/eprint/251914
PURE UUID: 405c4ab3-6e9f-458d-a894-9953a8128a1d

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Date deposited: 08 Nov 2000
Last modified: 29 Jan 2020 15:09

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