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Millimeter wave (mmWave) communication has been regarded as one of the mostpromising technologies for the future generation wireless networks because ofits advantages of providing a ultra-wide new spectrum and ultra-high datatransmission rate. To reduce the power consumption and circuit cost for mmWavesystems, hybrid digital and analog (HDA) architecture is preferred in such ascenario. In this paper, an artificial-noise (AN) aided secure HDA beamformingscheme is proposed for mmWave MISO system with low resolution digital-to-analogconverters (DACs) and finite-quantized phase shifters on RF. The additivequantization noise model for AN aided HDA system is established to make ananalysis of the secrecy performance of such systems. With the partial channelknowledge of eavesdropper available, an approximate expression of secrecy rate(SR) is derived. Then using this approximation formula, we propose a two-layeralternately iterative structure (TLAIS) for optimizing digital precoder (DP) ofconfidential message (CM), digital AN projection matrix (DANPM) and analogprecoder (AP). The inner-layer iteration loop is to design the DP of CMs andDANPM alternatively given a fixed matrix of AP. The outer-layer iteration loopis in between digital baseband part and analog part, where the former refers toDP and DANPM, and the latter is AP. Then for a given digital part, we propose agradient ascent algorithm to find the vector of AP vector. Given a matrix ofAP, we make use of general power iteration (GPI) method to compute DP andDANPM. This process is repeated until the terminal condition is reached.Simulation results show that the proposed TLAIS can achieve a better SRperformance compared to existing methods, especially in the highsignal-to-noise ratio region.

Secure Hybrid Digital and Analog Precoder for mmWave Systems with low-resolution DACs and finite-quantized phase shifters