[IEEE ComSoc-SPS ISAC Webinar 3rd season] 6th Prof. Fan Liu

On the Fundamental Limits of Integrated Sensing and Communications Under Gaussian Channels Abstract：Integrated Sensing and Communication (ISAC) is recognized as a promising technology for both the next-generation wireless networks and radar systems. In this talk, we consider a P2P ISAC model under vector Gaussian channels, and propose to use the CRB-rate region as a basic tool for depicting the fundamental sensing and communications (S&C) tradeoff. We characterize the S&C performance at the two corner points of the CRB-rate region. In particular, we derive the high-SNR communication capacity at the sensing-optimal point, and provide lower and upper bounds for the sensing CRB at the communication-optimal point. Our main results reveal a two-fold tradeoff in ISAC systems, consisting of the subspace tradeoff (ST) and deterministic-random tradeoff (DRT) that depend on the resource allocation and data modulation schemes employed for S&C, respectively.