Journal
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume 17, Issue 4, Pages 2675-2689Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2018.2800747
Keywords
Physical layer security; mm-wave; multipath; stochastic geometry; artificial noise; secrecy outage; secrecy throughput
Funding
- National Natural Science Foundation of China [61671364, 61701390, 61172093]
- Outstanding Young Research Fund of Shaanxi Province
- Young Talent Support Fund of Science and Technology of Shaanxi Province [2015KJXX-01]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20130201130003]
- China Post-doctoral Science Foundation [2017M613140]
- NRF, South Korea [MEST 2015R1A2A1A05000977]
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Mm-wave offers a sensible solution to the capacity crunch faced by 5G wireless communications. This paper comprehensively studies physical layer security in a multi-input single-output mm-wave system, where multiple single-antenna eavesdroppers are randomly located. Concerning the specific propagation characteristics of mm-wave, we investigate two secure transmission schemes, namely maximum ratio transmitting beamforming and artificial noise (AN) beamforming. Specifically, we first derive closed-form expressions of the connection probability for both schemes. We then analyze the secrecy outage probability in both non-colluding eavesdroppers and colluding eavesdroppers scenarios. Also, we maximize the secrecy throughput under a secrecy outage probability constraint, and obtain optimal transmission parameters, especially the power allocation between AN and the information signal for AN beamforming. Numerical results are provided to verify our theoretical analysis. We observe that the density of eavesdroppers, the spatially resolvable paths of the destination and eavesdroppers all contribute to the secrecy performance and the parameter design of mm-wave systems.
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