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Integrated sensing and communication (ISAC) has been envisioned as a solutionto realize the sensing capability required for emerging applications inwireless networks, while efficiently utilizing the available spectral, hardwareand energy resources. A commonly studied scenario in the ISAC literatureinvolves a transceiver (e.g., a base station) serving a communication user,while simultaneously sensing targets from the reflected echo signals, by actingas a mono-static radar. However, as signal transmission durations are typicallymuch longer than the radar echo round-trip times, the radar returns are drownedby the strong self interference (SI) from the transmitter - a phenomenon termedthe echo-miss problem. A promising approach involves the ISAC transceiver to befull-duplex (FD), and in this paper we jointly design the transmit and receivebeamformers at the transceiver, transmit precoder at the uplink user, andreceive combiner at the downlink user to simultaneously (a) maximize the uplinkand downlink rate, (b) maximize the transmit and receive radar beampatternpower at the target, and (c) suppress the residual SI. Numerical resultsillustrate that the proposed design can effectively achieve up to 60 dBdigital-domain SI cancellation, a higher average sum-rate, and more accurateradar parameter estimation compared with previous ISAC FD studies.

Joint Transmit and Receive Beamforming Design in Full-Duplex Integrated Sensing and Communications