Controlled convergence of QR least-squares adaptive algorithms - application to speech echo cancellation

With the increasing use of hands-free audio terminals in communication systems, the realization of a high quality hands-free function still remains a challenging research topic. The use of Fast QR Least-Squares algorithms, combined with a multirate structure, have been proposed in [5] for good performances and reduced complexity. In this paper, we propose to modify QR Least-Squares adaptive algorithms in order to control the adaptation process in the context of acoustic echo cancellation. This modification is based on a similar idea developed for Fast Transversal Filters. Simulation results demonstrate the efficiency of this modified adaptation process for QR-LS adaptive algorithms.