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 Capman et al. (1995) for good performance 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 (Slock and Kailath 1991; and Benallal and Gilloire 1989). Simulation results demonstrate the efficiency of this modified adaptation process for QR-LS adaptive algorithms.