Performance Analysis of ISAC System Under Correlated Communication-Sensing Channel

Integrated sensing and communication (ISAC) is regarded as a key technology for the next generation wireless communication, which has the potential to combine communication and radar modules efficiently and improve the performance. In millimeter wave band, multibeam ISAC is a promising architecture, where different beams are superimposed to simultaneously perform communication and sensing. In this paper, the performance of multibeam ISAC is evaluated under correlated communication and sensing channels. For communication, we evaluate the increase of communication capacity with sensing-assisted beam alignment procedure. For sensing, we derive the Cramer-Rao bound of location estimation, and use location estimation rate metric to indicate the sensing capacity. Theoretical analyses and simulation results demonstrate the improvement of sensing-assisted communication, and the tradeoff curve is provided to guide the communication-sensing power allocation design.