Adaptive cancellation of adjacent channel interference

Abstract

A new method to combat the adjacent channel interference (ACI) encountered with multichannel receivers is presented. In the case of a two-channel receiver, components of the desired signal may become present in the reference to the interference rendering traditional adaptive noise cancellation ineffective. This situation is similar to two-microphone systems used for speech enhancement. The crosstalk resistant adaptive noise canceller (CTRANC), designed to work in the two-microphone case, is unable to provide any signal improvement for the ACI model. A new system is proposed which uses a priori knowledge of the crosstalk gained by the injection of a known signal into either the input of the receiver or into the output of a transmitter, whichever is appropriate. This injection system is then compared with the CTRANC and other methods by means of extensive computer simulation.<>