Cancellation of nonlinear intersymbol interference in voiceband communication channels

A nonlinear cancellation technique for nonlinear voiceband channels is investigated. The technique uses a fast orthogonal search (FOS) algorithm to construct the cancellation filter by choosing terms from a large selection of candidates that have been selected after a theoretical investigation of the voiceband channel. This way it is possible to make a considerable reduction in the number of terms needed for the nonlinear cancellation filter (NLCF). The performance of the technique is tested by simulations of nonlinear voiceband communication systems. The results demonstrate that the NLCF can be considered a practical alternative for improvement of modern modem receivers.