Reference receiver aided digital self-interference cancellation in MIMO full-duplex transceivers,” submitted for review

Abstract—In this paper we propose and analyze a novel self-interference cancellation structure for single-channel MIMO full-duplex transceivers. The proposed structure utilizes refer-ence receiver chains to obtain reference signals for digital self-interference cancellation, which means that all the transmitter-induced nonidealities will be included in the digital cancellation signal. First, we will analyze the overall achievable performance of the proposed cancellation scheme, while also providing some insight into the possible bottlenecks. We also provide a detailed formulation of the actual cancellation procedure, and perform an analysis into the effect of the actual received signal of interest on self-interference coupling channel estimation. The achieved performance of the proposed reference receiver aided digital cancellation procedure is then assessed and verified with full waveform simulations. The analysis and waveform simulation results show that under practical transmitter RF/analog impair-ment levels, the proposed reference receiver based cancellation architecture can provide substantially better self-interference suppression than any existing solution, despite of deploying only low-complexity linear digital processing. I