Secure Massive MIMO Communication With Low-Resolution DACs

被引:33
|
作者
Xu, Jindan [1 ,2 ]
Xu, Wei [1 ,2 ]
Zhu, Jun [3 ]
Ng, Derrick Wing Kwan [4 ]
Swindlehurst, A. Lee [5 ]
机构
[1] Southeast Univ, Natl Mobile Commun Res Lab, Nanjing 210096, Jiangsu, Peoples R China
[2] Xidian Univ, State Key Lab Integrated Serv Networks, Xian 710071, Shaanxi, Peoples R China
[3] Qualcomm Inc, San Diego, CA 92121 USA
[4] Univ New South Wales, Sch Elect Engn & Telecommunicat, Sydney, NSW 2052, Australia
[5] Univ Calif Irvine, Henry Samueli Sch Engn, Irvine, CA 92697 USA
基金
美国国家科学基金会; 澳大利亚研究理事会;
关键词
Physical layer security; massive multiple-input multiple-output (MIMO); digital-to-analog converter (DAC); artificial noise (AN); PHYSICAL LAYER SECURITY; CHANNEL ESTIMATION; ARTIFICIAL NOISE; SECRECY CAPACITY; ACHIEVABLE RATE; TRANSMISSION; ANTENNAS; NETWORKS; SYSTEMS; DESIGN;
D O I
10.1109/TCOMM.2019.2895023
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, we investigate secure transmission in a massive multiple-input multiple-output system adopting low-resolution digital-to-analog converters (DACs). Artificial noise (AN) is deliberately transmitted simultaneously with the confidential signals to degrade the eavesdropper's channel quality. By applying the Bussgang theorem, a DAC quantization model is developed which facilitates the analysis of the asymptotic achievable secrecy rate. Interestingly, for a fixed power allocation factor phi, low-resolution DACs typically result in a secrecy rate loss, but in certain cases, they provide superior performance, e.g., at low signal-to-noise ratio (SNR). Specifically, we derive a closed-form SNR threshold which determines whether low-resolution or high-resolution DACs are preferable for improving the secrecy rate. Furthermore, a closed-form expression for the optimal phi is derived. With AN generated in the null-space of the user channel and the optimal phi, low-resolution DACs inevitably cause secrecy rate loss. On the other hand, for random AN with the optimal phi, the secrecy rate is hardly affected by the DAC resolution because the negative impact of the quantization noise can be compensated by reducing the AN power. All the derived analytical results are verified by numerical simulations.
引用
收藏
页码:3265 / 3278
页数:14
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