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  4. I/Q imbalance calibration for higher self-interference cancellation levels in Full-Duplex wireless transceivers
 
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2014
Conference Paper
Title

I/Q imbalance calibration for higher self-interference cancellation levels in Full-Duplex wireless transceivers

Abstract
This paper investigates a Full-Duplex transceiver using an active cancellation technique where an additional transmit chain is employed to create the self-interference cancellation signal. Both transmitters and also the receiver are impaired by frequency-dependent I/Q imbalance with different parameters. It is shown how an I/Q parameter deviation in these chains deteriorates the achievable self-interference suppression level. Three different types of pre-equalization units, with variable complexity degree and different implementation approach, are then introduced and investigated. These units correct the I/Q imbalance and retain the self-interference level to its value as in a perfectly I/Q matched full-duplex transceiver. They can even be used to fully calibrate the I/Q imbalance. Simulative results show that self-interference suppression levels of more than 71 dB can be achieved.
Author(s)
Askar, R.
Zarifeh, N.
Schubert, B.
Keusgen, W.
Kaiser, T.
Mainwork
1st International Conference on 5G for Ubiquitous Connectivity, 5GU 2014  
Conference
International Conference on 5G for Ubiquitous Connectivity (5GU) 2014  
DOI
10.4108/icst.5gu.2014.258148
Language
English
Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut HHI  
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