Abstract

DIAKITE, Souleymane  and  MARANTE RIZO, Francisco. Self-Interference Cancellation in MIMO Full-Duplex Transceivers. EAC [online]. 2019, vol.40, n.1, pp.59-70. ISSN 1815-5928.

The transceiver nonlinearities have recently been shown to limit the performance of in-band FD (Full-Duplex) devices. In this article, detailed modeling and mitigation algorithms of more critical of these nonlinearities, in order to obtain better SI (Self-Interference) cancellation performance are presented. In the transmitter side, we propose to applied DPD (Digital Predistortion) to both, transmit and cancellation chains in order to obtain output signals free from nonlinearities of RF components, and crosstalk effects, which allow better RF cancellation. In the receiver side, the nonlinearities of RF components are modeled and the residual SI that will experiment these nonlinearities will be mitigated by digital cancellation. Our proposed method, ''DPD cancellation'', provides one of the simple signal models of SI signal that takes into account more of RF components nonlinearities, and crosstalk effect between the transmitter chains in MIMO-FD (Multiple Input Multiple Output Full-Duplex) transceivers. In this paper, the effect of the phase noise has been considered in the transceiver architecture, which can be minimized by using the same local oscillator for transmitter, cancellation and receiver chains. The simulation results show that, our method, DPD cancellation, provides better SINR (Signal to Interference plus Noise Ratio) at the input of the detector at the receiver, when compared to others methods in literature. In this way, it can be considered as one of the promising methods for the practical implementation of FD transmission in the future wireless systems.

Keywords : Full-Duplex; Self-Interference; Cancellation; Digital Predistortion; MIMO.

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