Low Latency Self-Interference Suppression in In-Band Full-Duplex Relay

This paper reports on work in progress on a self-interference (SI) suppression method for in-band full-duplex (IBFD) relaying. We propose to implement the two-stage SI suppression method where feedforward linear finite impulse response (FIR) filters are designed in the digital domain considering the processing delay and error vector magnitude (EVM). While the analog SI cancellation (ASIC) filter coefficient is determined based on the least square (LS) estimator, the digital SI cancellation (DSIC) filter is designed by optimizing the estimation error as well as the filter length. Simulation results show that the proposed method can significantly suppress SI while reducing the processing delay at the relay.