Analog Self-Interference Mitigation for IBFD, Joint Radar-Communications in Vehicular Applications

Emerging applications such as autonomous vehicles and urban air mobility (UAM) rely on radar, communications, and positioning, navigation, and timing (PNT) capabilities, all of which compete for limited spectral resources. In-band, full-duplex (IBFD) systems promise better spectral efficiency but also introduce significant self-interference. In this paper, we discuss a combination of self-interference cancellation approaches for IBFD, joint radar-communications systems in the context of automated vehicles and urban air mobility. We propose and simulate an analog suppression technique and characterize its performance under realistic hardware limitations including bit precision, channel delay spread, time alignment, and carrier frequency.