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

TL;DR

This paper presents a novel nonlinear spatio-temporal digital cancellation method for self-interference in MIMO full-duplex transceivers, effectively modeling and canceling complex interference effects including hardware impairments.

Contribution

It introduces the first cancellation technique capable of handling nonlinearities, I/Q imbalance, and multipath effects in MIMO full-duplex systems, improving performance and power range.

Findings

Outperforms existing digital cancellers in simulations

Extends the usable transmit power range

Effectively models hardware nonlinearities and impairments

Abstract

This paper addresses the modeling and digital cancellation of self-interference in in-band full-duplex (FD) transceivers with multiple transmit and receive antennas. The self-interference modeling and the proposed nonlinear spatio-temporal digital canceller structure takes into account, by design, the effects of I/Q modulator imbalances and power amplifier (PA) nonlinearities with memory, in addition to the multipath self-interference propagation channels and the analog RF cancellation stage. The proposed solution is the first cancellation technique in the literature which can handle such a self-interference scenario. It is shown by comprehensive simulations with realistic RF component parameters and with two different PA models to clearly outperform the current state-of-the-art digital self-interference cancellers, and to clearly extend the usable transmit power range.