期刊
IEEE ACCESS
卷 7, 期 -, 页码 65332-65341出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2019.2916548
关键词
NOMA; visible light communication; physical-layer secrecy; optimal beamforming
资金
- National Natural Science Foundation of China [61701501, 61771474]
- Natural Science Foundation of Jiangsu Province [BK20170287]
- China Postdoctoral Science Foundation [2016M600452]
- Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province
In this paper, we consider the two key problems in the physical-layer security of nonorthogonal multiple access (NOMA) visible light communication (VLC) networks: investigating a closed-form achievable security rate and studying the optimal security beamforming design. Specifically, under the dimming control, practical power, and successive interference cancellation constraints, we derive both the outer and inner bounds of the security capacity region with closed-form expressions, which are evaluated via numerical results. Then, based on the proposed security-rate expression, we investigated the optimal security beamforming design to minimize the total LED power, and to maximize the minimum secrecy rate, respectively. Both the problems are nonconvex. We apply different relaxation techniques to efficiently solve them. The simulation results demonstrate the efficacy of the proposed security beamforming design schemes in the NOMA VLC networks.
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