Self-Interference Cancellation for Full-Duplex Radio Transceivers Using Extended Kalman Filter

Abstract

Full-duplex (FD) transceivers suffer from inevitable self-interference (SI) from the transceiver’s own transmitted signal which is 60–100 dB stronger than the desired signal of interest. A major FD transceiver design challenge is the SI cancellation. The techniques used for SI cancellation should be able to mitigate the SI signal below the desired signal level at the receiver and ideally below the receiver’s sensitivity level. In this letter, an SI cancellation technique using extended Kalman filter is presented. Performance evaluation of the proposed techniques is carried out on the basis of SINR at the receiver. The proposed technique provides an attractive analogue/RF SI cancellation and an SINR improvement in 90 dB.