Secure Integrated Sensing and Communication Under Correlated Rayleigh Fading

TL;DR

This paper investigates secure integrated sensing and communication over correlated Rayleigh fading channels, establishing achievable secrecy-distortion regions and providing insights for practical secure ISAC system design.

Contribution

It introduces a new model for secure ISAC with correlated Rayleigh fading and derives achievable secrecy-distortion regions, surpassing classical wiretap channel capacities in certain conditions.

Findings

Secrecy capacity exceeds classical wiretap limits in specific parameter ranges.

Achievable secrecy-distortion regions are characterized for correlated Rayleigh fading channels.

Practical design insights are provided for secure ISAC systems.

Abstract

We consider a secure integrated sensing and communication (ISAC) scenario, in which a signal is transmitted through a state-dependent wiretap channel with one legitimate receiver with which the transmitter communicates and one honest-but-curious target that the transmitter wants to sense. The secure ISAC channel is modeled as two state-dependent fast-fading channels with correlated Rayleigh fading coefficients and independent additive Gaussian noise components. Delayed channel outputs are fed back to the transmitter to improve the communication performance and to estimate the channel state sequence. We establish and illustrate an achievable secrecy-distortion region for degraded secure ISAC channels under correlated Rayleigh fading. We also evaluate the inner bound for a large set of parameters to derive practical design insights for secure ISAC methods. The presented results include in particular parameter ranges for which the secrecy capacity of a classical wiretap channel setup is surpassed and for which the channel capacity is approached.