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Active self-interference cancellation mechanism for full-duplex wireless transceivers

: Keusgen, W.; Askar, R.; Kaiser, T.; Schubert, B.; Haustein, T.


Institute of Electrical and Electronics Engineers -IEEE-:
9th International Conference on Cognitive Radio Oriented Wireless Networks, CROWNCOM 2014 : Oulu, Finland, 2 - 4 June 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-63190-003-7
ISBN: 978-1-4799-4732-4
International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) <9, 2014, Oulu>
Fraunhofer HHI ()

This paper investigates active cancellation techniques for a Full-Duplex transceiver. An auxiliary transmit chain is employed to create the cancellation signal, which is then injected at the receiver RF front-end by using a microstrip coupler. Two methods are proposed to calculate the self-interference cancellation signal. While the first method assumes the transmit chain to be strictly linear, the second one additionally incorporates nonlinear effects, occurring especially in the RF power amplifier. The linear method reports experimentally around 48 dB of self-interference suppression under linear system behavior. Experimental results show also 50 dB of suppression by using the nonlinear method and under nonlinear system behavior, whereas the linear one reports 47 dB of suppression under the same conditions.