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This paper addresses the modeling and digital cancellation ofself-interference in in-band full-duplex (FD) transceivers with multipletransmit and receive antennas. The self-interference modeling and the proposednonlinear spatio-temporal digital canceller structure takes into account, bydesign, the effects of I/Q modulator imbalances and power amplifier (PA)nonlinearities with memory, in addition to the multipath self-interferencepropagation channels and the analog RF cancellation stage. The proposedsolution is the first cancellation technique in the literature which can handlesuch a self-interference scenario. It is shown by comprehensive simulationswith realistic RF component parameters and with two different PA models toclearly outperform the current state-of-the-art digital self-interferencecancellers, and to clearly extend the usable transmit power range.

Modeling and Efficient Cancellation of Nonlinear Self-Interference in MIMO Full-Duplex Transceivers