Analysis of a delayless subband adaptive filter structure

In this paper, we present an analysis of the delayless subband adaptive filter structure proposed by Merched et al. We derive a simple expression for the excess MSE of the proposed structure, and show that it requires up to 3.7 times less computational complexity than the corresponding fullband LMS structure. Also, we establish a connection between subband and block adaptive filtering, where the latter can be interpreted as a special case of the former. Some computer simulations are presented in order to verify the performance of the proposed structure and the theoretical results.