Adaptive cancellation of adjacent channel interference
Date
1989
Authors
Hedstrom, Brad Allen
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Abstract
A new method to combat adjacent channel interference encountered with multi-channel receivers is presented. In the case of a two-channel receiver, there exits two crosstalk. paths which allow the desired signal to become present in the reference of the interference, thus traditional adaptive noise cancellation is ineffective.
The two-channel receiver is similar to two-microphone systems used for speech enhancement. Models describing the baseband and passband crosstalk are developed. The Crosstalk Resistant Adaptive Noise Canceller (CTRANC). designed to work in the two-microphone case, fails when confronted with the two-channel receiver.
A new system is proposed which uses a priori knowledge of the crosstalk gained by the injection of a known signal into the input of the receiver. This injection systems is then compared with the CTRANC for both baseband and passband systems by extensive computer simulation.