A new configuration for jointly adaptive cancellation of echo and ISI in voiceband data transmission systems

The authors develop a model in which echo and intersymbol interference (ISI) can be eliminated simultaneously. The features of the proposed model include: (1) low-complexity echo cancellation with faster convergence than the traditional configuration, the number of multiplications and tap coefficients required being between 25% and 37.5% and 16.7% and 25%, respectively, of those of the traditional configuration; (2) application of an adaptive cancellation, instead of the inverse filtering, to eliminate ISI, so that the dependence of the convergence behaviors of equalizers on the channel characteristics, a problem common to the traditional method for elimination of ISI, is removed