Truly Full-Duplex Integrated Sensing and Single-User Communication at mmWave

In this paper, we propose a design for hybrid precoding and combining at mmWave that enables simultaneous monostatic sensing and full-duplex (FD) communication. This joint design mitigates the self-interference (SI) caused by FD operation at the base station (BS). Precoders at the FD BS are designed to maximize signal-to-leakage-plus-noise ratio (SLNR) for downlink (DL) communication and sensing, treating the SI as leakage. The analog combiner minimizes the residual SI at the FD BS under uplink (UL) communication and sensing gain constraints. Moreover, an interference-aware digital combiner separates the target reflections from the UL signals, followed by orthogonal frequency division multiplexing (OFDM) radar for target parameter estimation. Numerical results demonstrate the effectiveness of the proposed design to simultaneously support FD communication and sensing at mmWave.