Problem
Research questions and friction points this paper is trying to address.
integrated sensing and communications
hierarchical ISAC architecture
spectral efficiency
multi-static sensing
cell-free access points
Integrated Sensing and Communications over Hierarchical Cellular and Cell-Free MIMO Systems
🤖 AI Summary
本文研究了结合传统基站和分布式无蜂窝接入点的综合感知与通信系统，通过分层架构减少前传开销，提高总吞吐量和感知精度。
📝 Abstract
This paper studies integrated sensing and communications (ISAC) over a hybrid system that seamlessly combines legacy cellular base stations with distributed cell-free (CF) access points (APs). We propose a hierarchical ISAC architecture where a central base station (CBS) serves its near users and simultaneously operates as a monostatic radar for aerial target detection, while distributed APs---many idle under user-centric clustering---act as cost-free bistatic receivers. The CBS jointly handles communication processing and multi-static sensing fusion, reducing fronthaul overhead compared to conventional cell-free ISAC. To achieve this, a five-phase time-division duplexing workflow with precise ISAC role assignment is specified. Closed-form expressions for spectral efficiency and multi-static sensing signal-to-noise ratio analytically characterize the communications--sensing Pareto frontier. Numerical results confirm that the proposed hierarchical design simultaneously achieves higher sum throughput and superior sensing accuracy than conventional cell-free ISAC.
Innovation
Methods, ideas, or system contributions that make the work stand out.
Integrated Sensing and Communications (ISAC)
Hierarchical Architecture
Monostatic Radar
Bistatic Receivers
Multi-static Sensing Fusion
🔎 Similar Papers
No similar papers found.
