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Single-antenna full-duplex communication technology has the potential tosubstantially increase spectral efficiency. However, limited propagation domaincancellation of single-antenna system results in a higher impact of receiverchain nonlinearities on the residual self-interference (SI) signal. In thispaper, we offer a comprehensive SI model for single-antenna full-duplex systemsbased on direct-conversion transceiver structure considering nonlinearities ofall the transceiver radio frequency (RF) components, in-phase/quadrature (IQ)imbalances, phase noise effect, and receiver noise figure. To validate ourmodel, we also propose a more appropriate digital SI cancellation approachconsidering receiver chain RF and baseband nonlinearities. The proposedtechnique employs orthogonalization of the design matrix using QR decompositionto alleviate the estimation and cancellation error. Finally, throughcircuit-level waveform simulation, the performance of the digital cancellationstrategy is investigated, which achieves 20 dB more cancellation compared toexisting methods.

A Comprehensive Self-interference Model for Single-antenna Full-duplex Communication Systems