ZF Precoding-Based Spatial Domain SIC Method for MIMO Full Duplex Systems: A Performance Analysis Under CSI Errors

In this letter, we evaluate the performance of a newly developed spatial domain zero-forcing (ZF) based self-interference cancellation (SIC) method in a generic multiple-input multiple-output (MIMO) full-duplex (FD) system. To this end, we theoretically evaluate the influence of channel state information (CSI) error on the SIC performance of our considered approach, and we validate our results through simulations. In particular, we show that the additional received self-interference (SI) power due to the CSI errors is quadratically proportional to a particular parameter
$\alpha $
, quantifying the level of CSI errors. Furthermore, simulations results show that the increase of SI power has a negligible impact on the overall system performance in terms of spectral efficiency (SE), which proves the robustness of our considered SIC method.