On the use of a modified fast affine projection algorithm in subbands for acoustic echo cancelation

The fast affine projection (FAP) has been proposed recently as a new adaptive filtering algorithm which possesses LMS like complexity but may achieve RLS like convergence. We investigate the use of FAP algorithms in subbands for acoustic echo cancellation (AEC). To this end, some modifications are first made on the FAP based on the consideration of the numerical stability. The modified FAP algorithm is then used in a complex adaptive subband filter structure for AEC. Advantages of the resulting subband FAP over the full-band NLMS scheme in terms of both complexity and performance are demonstrated by simulations.