Abstract
In this paper, a simple modification of the well-known LMS algorithm, called dual LMS (DLMS) algorithm, is proposed for adaptive echo cancellation. The new algorithm operates as if two LMS algorithms are working in a cascaded manner, where the transition threshold between the two LMS algorithms and their step sizes are optimally chosen to yield the most rapid convergence under an initial and desired residual echo. As compared to the original LMS algorithm, the DLMS algorithm offers much better convergence performance and retains the advantage of hardware simplicity. Computer simulation is employed to show the effectiveness of the algorithm.