Wireless Power Transfer Under Secure Communication with Multiple Antennas and Eavesdroppers
In this paper, we analyze the physical layer secrecy performance of a 5G radio frequency energy harvesting (RF-EH) network in the presence of multiple passive eavesdroppers. In this system, the source is considered as an energy-limited node, hence it harvests energy from RF signals generated by a power transfer station to use for information transmission. Additionally, in order to enhance the energy harvesting and system performance, the source is equipped with multiple antennas and employs maximal ratio combining (MRC) and transmit antenna selection (TAS) techniques to exploit the benefits of spatial diversity. Given these settings, the exact close-form expressions of existence probability of secrecy capacity and secrecy outage probability are derived. Furthermore, the obtained results indicate that multiple antennas technique applied at the source not only facilitates energy harvesting but also improves secrecy performance of the investigated network. Finally, Monte-Carlo simulation is provided to confirm our analytical results.
KeywordsEnergy harvesting Maximal ratio combining Secrecy capacity Transmit antenna selection Wireless power transfer
This work was supported by Newton Prize 2017 and by a Research Environment Links grant, ID 339568416, under the Newton Programme Vietnam partnership. The grant is funded by the UK Department of Business, Energy and Industrial Strategy (BEIS) and delivered by the British Council. For further information, please visit www.newtonfund.ac.uk/.
- 3.Ha, D.B., Tran, D.D., Tran, H.V., Hong, E.K.: Performance of amplify-and-forward relaying with wireless power transfer over dissimilar channels. Elektronika ir Elektrotechnika J. 21(5), 90–95 (2015)Google Scholar
- 10.Chen, X., Chen, J., Liu, T.: Secure wireless information and power transfer in large-scale MIMO relaying systems with imperfect CSI. In: IEEE GLOBECOM, pp. 4131–4136 (2014)Google Scholar
- 11.He, B., Zhou, X.: On the placement of RF energy harvesting node in wireless networks with secrecy considerations. In: IEEE Globecom Workshops, pp. 1355–1360 (2014)Google Scholar