Self-Interference Cancellation for Full-Duplex Radio Transceivers Using Extended Kalman Filter
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Self-Interference Cancellation for Full-Duplex Radio Transceivers Using Extended Kalman Filter Areeba Ayesha1 • Shabbir Majeed Chaudhry1
Received: 1 January 2019 / Revised: 12 February 2020 / Accepted: 17 February 2020 Ó The National Academy of Sciences, India 2020
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. Keywords Analogue/RF cancellation Extended Kalman filter (EKF) Full-duplex (FD) Self-interference (SI)
Full-duplex (FD), a bidirectional communication scheme, is an emerging area of research towards improving the RF spectral efficiency. FD has gained a great deal of attention of researchers for next-generation wireless radio communication systems such as 5G. In FD, communication takes place over the same spectral and temporal resources and shares the same frequency between uplink and downlink. As a result, self-interference (SI) is inevitable in FD receivers, which needs to be estimated and removed from the FD transceiver. This research focuses on SI cancellation for FD transceivers using extended Kalman filtering. & Shabbir Majeed Chaudhry [email protected] Areeba Ayesha [email protected] 1
Department of Electrical Engineering, University of Engineering and Technology, Taxila 47050, Pakistan
One of the main challenges in FD transceiver design is the presence of the self-interference (SI) signal from the transmitter that appears as a strong blocker signal at the receiver. This SI signal is almost 60–100 dB stronger than the desired received signal [1] and highly degrades the receiver sensitivity and link throughput [2]. Several SI cancellation mechanisms have been proposed in the literature to alleviate the transceiver’s SI effects on receiver’s performance. These SI cancellation mechanisms can include both passive and active cancellation techniques. It has been demonstrated in [2, 3] that SI signal can be significantly mitigated to the desired lower levels by using antenna cancellation. Similarly, active SI cancellation techniques including RF cancellation [4–7] have been reported to considerably reduce the SI signal at the receiver. Digital SI cancellation techniques have been reported in [8], [9] for the cancellation of residual SI signal at the receiver chain in digital domain. Antenna cancellation along with digital cancellation does not mitigate the SI signal effectively, beca
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