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Polyphase analysis of subband adaptive filters

Weiss, Stephan and Stewart, Robert and Harteneck, Moritz and Stenger, Alexander (1999) Polyphase analysis of subband adaptive filters. In: Conference Record of the Thirty-Third Asilomar Conference on Signals, Systems, and Computers, 1999. IEEE, New York, pp. 903-907. ISBN 0780357000

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Abstract

Based on a polyphase analysis of a subband adaptive filter (SAF) system, it is possible to calculate the optimum subband impulse responses to which the SAF system will converge. We give some insight into how these optimum impulse responses are calculated, and discuss two applications of our technique. Firstly, the performance limitations of an SAF system can be explored with respect to the minimum mean square error performance. Secondly, fullband impulse responses can be correctly projected into the subband domain, which is required for example for translating constraints for subband adaptive beamforming. Examples for both applications are presented.