BER Comparison Between Time-Domain and Frequency-Domain Self-Interference Canceller in 5G-Based Full-Duplex Mobile Communications

Full-duplex mobile communications are gaining attention as an access method between base station (BS) and user equipment (UE) that can improve frequency utilization efficiency. The important technology is to cancel or eliminate self-interference that occurs between the transmitter (TX) and its own receiver (RX) at both BS and UE. This paper presents a BER comparison between time-domain and frequency-domain self-interference canceller (SIC) operated at baseband. Specifically, we show the BER performance of OFDM-based QPSK and 16/64/256/1024-QAM signals as parameters of the coding rate when time-domain or frequency-domain SIC is applied. The results indicate that both SIC can drastically improve the BER for QPSK and QAM signals compared without SIC, and the frequency-domain SIC is more effective as the modulation order of QAM increases.