Asymmetric digital subscriber line echo cancellation

To increase the convergence speed and reduce computational complexities associated with an echo canceller used to cancel digital subscriber loop echo responses with long tails, a new echo canceller is proposed which is composed of a cascade of a lattice and an orthogonalised infinite impulse response (IIR) (CALAOI) filter. The propose echo canceller was found to have a higher convergence speed and substantially reduced complexity compare with those of a conventional finite impulse response (FIR) echo canceller