On Stochastic Performance Analysis of Secure Integrated Sensing and Communication Networks

2025-04-13

AI Summary

This work investigates the joint stochastic secure communication and target sensing performance in a MIMO integrated sensing and communication (ISAC) downlink system under dual eavesdropping threats: a single-antenna communication eavesdropper and a multi-antenna sensing eavesdropper. To simultaneously ensure confidential transmission to legitimate users, accurate target angle estimation, and robustness against location inference attacks, we propose a unified analytical framework. For Rayleigh fading channels and uniformly distributed target azimuth angles, we derive closed-form expressions for both the ergodic secrecy rate and the ergodic Cramér–Rao bound (CRB) at both the base station (for sensing) and the sensing eavesdropper. Leveraging the central limit theorem, our analysis yields precise, tractable expressions. Numerical results validate the accuracy of the derived formulas and explicitly characterize the fundamental trade-off between secrecy performance and sensing accuracy.

Technology Category

• Intelligent Robots: Multimodal Perception & Sensor Fusion
• Machine Learning: Multi-instance/Multi-view Learning
• Planning, Routing, and Scheduling: Scheduling under Uncertainty

Application Category

• Security and Privacy: Large-scale security measurements
• Search and Retrieval-Augmented AI: Web evaluation methodologies and metrics
• Systems and Infrastructure for Web, Mobile and WoT: Web performance, measurement, and characterization

Abstract

This paper analyzes the stochastic security performance of a multiple-input multiple-output (MIMO) integrated sensing and communication (ISAC) system in a downlink scenario. A base station (BS) transmits a multi-functional signal to simultaneously communicate with a user, sense a target angular location, and counteract eavesdropping threats. The system includes a passive single-antenna communication eavesdropper and a multi-antenna sensing eavesdropper attempting to infer the target location. The BS-user and BS-eavesdroppers channels follow Rayleigh fading, while the target azimuth angle is uniformly distributed. To evaluate the performance, we derive exact expressions for the secrecy ergodic rate and the ergodic Cramer-Rao lower bound (CRB) for target localization at both the BS and the sensing eavesdropper. This involves computing the probability density functions (PDFs) of the signal-to-noise ratio (SNR) and CRB, leveraging the central limit theorem for tractability. Numerical results validate our findings.

Problem

• Analyze security performance of MIMO ISAC systems
• Evaluate secrecy rates and localization bounds under eavesdropping
• Model Rayleigh fading channels and angular distributions

Innovation

• MIMO ISAC system for secure communication
• Multi-functional signal combats eavesdropping threats
• Derives secrecy rate and CRB expressions