Composite PNLMS & NLMS adaptation: a new method for network echo cancellation

This paper describes an improved version of the previously proposed fast converging algorithm, the proportionate normalized least mean squares (PNLMS), for network echo cancellers. We introduce a simple analysis of the PNLMS convergence behavior to show why after the fast initial convergence, it slows down. Also, the method has worked out to overcome this deficiency is presented. The improvement is shown by simulation results.