Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

Secure Transmission for Fluid Antenna-Aided ISAC Systems

Yunxiao Li, Qian Zhang, Xuejun Cheng, Zhiguo Wang, Xiaoyan Wang, Hongji Xu, Ju Liu

TL;DR

This letter investigates secure transmission in FA-aided ISAC systems, where the spatial agility of FAs enables enhanced physical layer security and jointly optimize antenna position vector (APV) and beamforming to maximize the multiuser sum secrecy rate, which complicates the solution process.

Abstract

Fluid antenna (FA) has become a highly promising technology and has recently been used to enhance the integrated sensing and communication (ISAC) system. However, the scenario where sensing targets act as eavesdroppers in ISAC and how to maximize the sum secrecy rate has not been addressed. This letter investigates secure transmission in FA-aided ISAC systems, where the spatial agility of FAs enables enhanced physical layer security. We jointly optimize antenna position vector (APV) and beamforming to maximize the multiuser sum secrecy rate, which complicates the solution process. To solve the resulting non-convex problem, we use a block successive upper-bound minimization (BSUM) algorithm, which incorporates the proximal distance algorithm (PDA) for closed-form beamformer updates and extrapolated projected gradient (EPG) for APV optimization. Simulation results show that the proposed FA-ISAC scheme achieves over 20$\%$ sum secrecy rate gain compared to fixed-position antenna (FPA) systems.

Secure Transmission for Fluid Antenna-Aided ISAC Systems

TL;DR

This letter investigates secure transmission in FA-aided ISAC systems, where the spatial agility of FAs enables enhanced physical layer security and jointly optimize antenna position vector (APV) and beamforming to maximize the multiuser sum secrecy rate, which complicates the solution process.

Abstract

Fluid antenna (FA) has become a highly promising technology and has recently been used to enhance the integrated sensing and communication (ISAC) system. However, the scenario where sensing targets act as eavesdroppers in ISAC and how to maximize the sum secrecy rate has not been addressed. This letter investigates secure transmission in FA-aided ISAC systems, where the spatial agility of FAs enables enhanced physical layer security. We jointly optimize antenna position vector (APV) and beamforming to maximize the multiuser sum secrecy rate, which complicates the solution process. To solve the resulting non-convex problem, we use a block successive upper-bound minimization (BSUM) algorithm, which incorporates the proximal distance algorithm (PDA) for closed-form beamformer updates and extrapolated projected gradient (EPG) for APV optimization. Simulation results show that the proposed FA-ISAC scheme achieves over 20 sum secrecy rate gain compared to fixed-position antenna (FPA) systems.
Paper Structure (8 sections, 30 equations, 4 figures)

This paper contains 8 sections, 30 equations, 4 figures.

Table of Contents

  1. INTRODUCTION
  2. SYSTEM MODEL
  3. BEAMFORMER AND APV OPTIMIZATION
  4. Beamformer Optimization
  5. APV Optimization
  6. Computational Complexity Analysis
  7. SIMULATION RESULTS
  8. CONCLUSION

Figures (4)

  • Figure 1: Secure transmission for FA-aided ISAC systems model.
  • Figure 2: Convergence of sum secrecy rate under different transmit power budgets with 2-Eve. $M= 8$, $K = 2$.
  • Figure 3: Trade-off performance between sum secrecy rate and probing power $M= 8$, $P_{max} = 30$dBm.
  • Figure 4: Sum secrecy rate under different numbers of BS antennas. $K$=2.