Full Duplex Based Digital Out-of-Band Interference Cancellation for Collocated Radios

In this work, a novel out-of-band interference cancellation (OOBIC) method, based on a full duplex interference cancellation technique, is proposed. The aim of the OOBIC is to counteract the interference that may occur when collocated radios transmit and receive in closely located frequency bands. The main advantage of the method is that the cancellation can be performed directly on the data signal, with the desired signal present, without complex nonlinear modeling, and without additional synchronization between the collocated radios. The method is validated both analytically and through simulations, and is shown to successfully increase the signal quality in OOB interference situations where the signal otherwise would have been unrecoverable.