Near-Field Full-Duplex Integrated Sensing and Communication with Dynamic Metasurface Antennas

A full duplex (FD) multiple-input multiple-output (MIMO) communication system can also provide monostatic sensing capabilities by processing the echoes of the downlink (DL) signal or by dedicating specific spatial resources to sensing. This integrated sensing and communication (ISAC) setting requires the design of precoders and combiners at the FD base station (BS) to balance sensing and communication performance while suppressing the self-interference (SI) caused by simultaneous transmission and reception. Although this subject has been studied for conventional arrays that operate in the far-field (FF), nearfield (NF) FD-ISAC is still in its nascent stages. Given that the extremely large arrays to be used in high frequency bands and in the upper mid-band will lead to operation in the NF for many users, it is essential to design techniques for NF FD-ISAC. In this paper, we tackle the design of the precoders and combiners that enable NF FD-ISAC while exploiting dynamic metasurface antennas (DMAs) at the BS. We evaluate our design considering sensing and communication metrics, in addition to its SI mitigation capability.