Robust Multi-Beam Secure mmWave Wireless Communication for Hybrid Wiretapping Systems

TL;DR

This paper introduces a robust multi-beam array transceiver scheme for millimeter wave wireless systems that enhances physical layer security against hybrid eavesdroppers by jointly optimizing beamforming and artificial noise.

Contribution

It proposes a novel artificial noise-aided beamforming scheme that accounts for imperfect channel information and hybrid eavesdroppers, improving security and energy efficiency.

Findings

The scheme effectively suppresses jamming from active eavesdroppers.

It reduces transmit power while maintaining secure communication.

Simulation results confirm superior energy efficiency and security performance.

Abstract

In this paper, we consider the physical layer (PHY) security problem for hybrid wiretapping wireless systems in millimeter wave transmission, where active eavesdroppers (AEs) and passive eavesdroppers (PEs) coexist to intercept the confidential messages and emit jamming signals. To achieve secure and reliable transmission, we propose an artificial noise (AN)-aided robust multi-beam array transceiver scheme. Leveraging beamforming, we aim to minimize transmit power by jointly designing the information and AN beamforming, while satisfying valid reception for legitimate users (LUs), per-antenna power constraints for transmitter, as well as all interception power constraints for eavesdroppers (Eves). In particular, the interception power formulation is taken into account for protecting the information against hybrid Eves with imperfect AE channel state information (CSI) and no PE CSI. In light of the intractability of the problem, we reformulate the considered problem by replacing non-convex constraints with tractable forms. Afterwards, a two-stage algorithm is developed to obtain the optimal solution. Additionally, we design the received beamforming weights by means of minimum variance distortionless response, such that the jamming caused by AEs can be effectively suppressed. Simulation results demonstrate the superiority of our proposed scheme in terms of energy efficiency and security.