New IIR echo canceller using a dual error criterion and lattice structures

An adaptive IIR echo canceller for data transmission is presented, where the output-error criterion and the equation-error criterion are used simultaneously. The combined use of these two error criteria provides a fast initial convergence and leads to unbiased parameter estimates, even in the presence of noise. The poles of the echo path transfer function are modelled by means of lattice structures, which greatly simplifies the stability monitoring. The performance of the proposed echo canceller, as updated by LMS-type algorithms, is evaluated by computer simulation.