A Multi-Band Full-Duplex Prototype for Integrated Sensing and Communication

Integrated sensing and communication (ISAC) has emerged as a key enabler for the next-generation radio network. ISAC systems aim to enable both wireless sensing and wireless data transmission functionality in one integrated system. While existing ISAC prototypes in the literature predominantly focus on single-band full-duplex operations with array antennas and spatially separated sensing targets and communication user equipment (UE) to mitigate signal interference, this paper presents a novel multi-band full-duplex ISAC prototype leveraging a software-defined radio (SDR) USRP X440. In this initial implementation, constrained by host PC performance limitations, the proposed system supports a monostatic sensing link at 24.8 GHz with 150 MHz bandwidth for range estimation alongside a bistatic communication link at 24.2 GHz with 150 MHz bandwidth, each employing distinct orthogonal frequency -division multiplexing (OFD M) waveforms. Experimental results demonstrate successful target detection with a range resolution of 1 m while maintaining robust wireless communication performance with minimal signal interference between sensing and communication functionalities.