ISAC With UWB: Reliable Decoupling and Target Sensing

Ultra wideband (UWB) systems have received great interest again due to the high range resolution, flexible data transmission capability, and low power consumption. In this paper, we develop a practical asynchronous integrated sensing and communication (ISAC) system using impulse radio UWB signals. This system operates within a joint mono-bistatic sensing network, accommodating multiple static and dynamic targets. To achieve simultaneous communication and target sensing, a reliable soft information based decouple solution is proposed to perform data demodulation in the typical UWB modulation waveforms. The data transmission can benefit from proper channel sensing, to about 2-3 dB gain, by exploiting the multipath components for demodulation. In addition to the demodulated data bits at the bi-static receiver, the environmental target distance and Doppler shift can also be achieved at both mono- and bi-static receivers, respectively. We then evaluate the sensing capability of the ISAC UWB system, by extensive simulations and practical experiments. The target tracking accuracy can be achieved within 20 cm at over 80% confidence, with commercial UWB devices according to practical measurements.