Secure Transmissions in Wireless Information and Power Transfer Millimeter-Wave Ultra-Dense Networks

The millimeter-wave (mmWave) ultra-dense networks are more suitable for wireless power transfer, since the short-distance transmissions experience less pathloss and the base station (BS) packed with large-scale antenna arrays can achieve significant array gains. However, the secrecy performance of t...

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Bibliographic Details
Published in:IEEE transactions on information forensics and security 2019-07, Vol.14 (7), p.1817-1829
Main Authors: Sun, Xiaoli, Yang, Weiwei, Cai, Yueming, Tao, Liwei, Liu, Yang, Huang, Yongming
Format: Article
Language:English
Subjects:
Antenna arrays
Communication system security
Eavesdropping
effective secrecy throughput
Energy measurement
energy-information coverage probability
Exact solutions
Information processing
Mathematical analysis
Millimeter waves
Millimeter-wave (mmWave)
Reliability
Security
Splitting
stochastic geometry
SWIPT
Switching theory
ultra-dense networks
Wireless communication
Wireless power transmission
Wireless sensor networks
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Summary:The millimeter-wave (mmWave) ultra-dense networks are more suitable for wireless power transfer, since the short-distance transmissions experience less pathloss and the base station (BS) packed with large-scale antenna arrays can achieve significant array gains. However, the secrecy performance of the simultaneous wireless information and power transfer (SWIPT) mmWave ultra-dense networks has not been investigated so far. In this paper, we consider the secure communications in downlink SWIPT mmWave ultra-dense networks, where the energy-constrained users extract energy and information from the mmWave signals in the presence of multiple eavesdroppers. First, the analytical expressions of the energy-information coverage probability are derived for both power splitting and time switching policies using stochastic geometry. Then, we derive the closed-form expressions of the secrecy probability in the presence of multiple independent or colluding eavesdroppers. Finally, the effective secrecy throughput (EST), which can measure the network energy coverage, secure, and reliable transmission performance in a unified manner, is derived. Theoretical analysis and simulation results reveal that the EST first increases and then decreases with the increasing of the transmit power, power/time splitting ratio, codeword transmission rate, and confidential information rate. Furthermore, reducing the beamwidth of the signal at BSs can decrease the information leakage and improve the EST.
ISSN:1556-6013
1556-6021
DOI:10.1109/TIFS.2018.2885286