Performance Analysis of Wideband Near-Field Sensing (NISE) in Integrated Sensing and Communication Systems

The core message of this paper is to provide a comprehensive performance analysis of wideband near-field sensing (NISE) in integrated sensing and communication (ISAC) systems, focusing on the fundamental Cramér-Rao bounds (CRBs) and their asymptotic behavior. The analysis reveals the joint benefits of near-field effects and large bandwidth on sensing performance, and proposes practical beamforming approaches to enable scalable tradeoffs between sensing and communication functions.