Adaptive Filter Design for Simultaneous In-band Full-duplex Communication and Radar

The in-band full-duplex (IBFD) wireless communication can achieve not only appreciable throughput gain but also is a key technology to enable concurrent radar and communication by one hardware. In such a system, an analog self-interference (SI) canceller is essential so that the received signal can be processed digitally to achieve sufficient SNR for IBFD communication. Unlike the previous similar works which rely on a classical matched filter, this paper derives the range- Doppler profile from the state of an adaptive filter, which primarily is applied to cancel the residual SI. Using standard IEEE 802.11ac signal, the proposed waveform-independent technique in this paper is simulated in a multi-target IBFD scenario. Furthermore, we employed a proof of concept setup to validate the proposed approach. The simulation and experimental results confirm that our method can render accurate range and velocity detection, and potentially satisfies a wide spectrum of opportunistic wireless sensing applications, ranging from hand/body gesture detection to tracking and localization.