Uncertainty-Aware Jamming Mitigation with Active RIS: A Robust Stackelberg Game Approach

TL;DR

This paper proposes a robust anti-jamming strategy using active reconfigurable intelligent surfaces and a Stackelberg game framework to effectively mitigate malicious jamming under channel uncertainties.

Contribution

It introduces a novel Stackelberg game approach for robust anti-jamming design with active RIS, addressing channel uncertainties and optimizing power, beamforming, and reflection.

Findings

The proposed scheme effectively mitigates jamming under uncertainties.

Simulation shows superior performance compared to baseline methods.

The equilibrium existence and optimal policies are theoretically validated.

Abstract

Malicious jamming presents a pervasive threat to the secure communications, where the challenge becomes increasingly severe due to the growing capability of the jammer allowing the adaptation to legitimate transmissions. This paper investigates the jamming mitigation by leveraging an active reconfigurable intelligent surface (ARIS), where the channel uncertainties are particularly addressed for robust anti-jamming design. Towards this issue, we adopt the Stackelberg game formulation to model the strategic interaction between the legitimate side and the adversary, acting as the leader and follower, respectively. We prove the existence of the game equilibrium and adopt the backward induction method for equilibrium analysis. We first derive the optimal jamming policy as the follower's best response, which is then incorporated into the legitimate-side optimization for robust anti-jamming design. We address the uncertainty issue and reformulate the legitimate-side problem by exploiting the error bounds to combat the worst-case jamming attacks. The problem is decomposed within a block successive upper bound minimization (BSUM) framework to tackle the power allocation, transceiving beamforming, and active reflection, respectively, which are iterated towards the robust jamming mitigation scheme. Simulation results are provided to demonstrate the effectiveness of the proposed scheme in protecting the legitimate transmissions under uncertainties, and the superior performance in terms of jamming mitigation as compared with the baselines.