Fundamental Limits of Communication-Assisted Sensing in ISAC Systems
arxiv(2024)
摘要
Integrated sensing and communication (ISAC) system stands out as a pivotal
usage scenario of 6G. To explore the coordination gains offered by the ISAC
technique, this paper introduces a novel communication-assisted sensing (CAS)
system. The CAS system can endow users with beyond-line-of-sight sensing
capability, wherein the base station with favorable visibility senses
device-free targets, simultaneously transmitting the acquired sensory
information to users. Within the CAS framework, we characterize the fundamental
limits to reveal the achievable distortion between the state of the targets of
interest and their reconstruction at the users' end. Finally, within the
confines of this theoretical framework, we employ a typical application as an
illustrative example to demonstrate the minimization of distortion through
dual-functional waveform design, showcasing the potential of CAS in enhancing
sensing capabilities.
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