Subband MMSE bounds for filterbank adaptation in system modeling non-uniform subband adaptive filters

Minimum mean square error estimators have been developed for non-uniform subband adaptive filters (SAF) in system modeling configurations. The next step towards practical implementation of non-uniform SAF involves developing an adaptive algorithm to control the non-uniform filterbank's bandwidths and decimation factors. This paper constructs such an algorithm using subband minimum mean square error (MMSE) bounds to suggest decimation factors. A numerical simulation shows that a non-uniform SAF can achieve lower MSE with lower complexity than an equivalent uniform SAF.