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Millimeter wave (mmWave) communications have been considered as a keytechnology for future 5G wireless networks. In order to overcome the severepropagation loss of mmWave channel, mmWave multiple-input multiple-output(MIMO) systems with analog/digital hybrid precoding and combining transceiverarchitecture have been widely considered. However, physical layer security(PLS) in mmWave MIMO systems and the secure hybrid beamformer design have notbeen well investigated. In this paper, we consider the problem of hybridprecoder and combiner design for secure transmission in mmWave MIMO systems inorder to protect the legitimate transmission from eavesdropping. Wheneavesdropper's channel state information (CSI) is known, we first propose ajoint analog precoder and combiner design algorithm which can prevent theinformation leakage to the eavesdropper. Then, the digital precoder andcombiner are computed based on the obtained effective baseband channel tofurther maximize the secrecy rate. Next, if prior knowledge of theeavesdropper's CSI is unavailable, we develop an artificial noise (AN)-basedhybrid beamforming approach, which can jam eavesdropper's reception whilemaintaining the quality-of-service (QoS) of intended receiver at thepre-specified level. Simulation results demonstrate that our proposedalgorithms offer significant secrecy performance improvement compared withother hybrid beamforming algorithms.

Hybrid Procoder and Combiner Design for Secure Transmission in mmWave MIMO Systems