IEEE Wireless Communications Letters

Efficient AN-Aided Scheme to Power RF-EH Source Nodes and Secure Their Transmissions

Ahmed El Shafie, Asma Mabrouk, Kamel Tourki, Naofal Al‐Dhahir

Published Jul 18, 2017• 3 citations

Abstract

We propose an artificial-noise (AN)-aided transmission scheme to achieve two objectives: 1) energize a single-antenna legitimate transmitter (Alice) by receiving an AN signal from a multi-antenna base-station (Bob) and 2) secure the information signal transmitted from Alice to Bob from eavesdropping by a multi-antenna eavesdropper (Eve). We assume a two-phase transmission scheme. In the first phase, Bob transmits two orthogonal precoded AN vectors to power Alice and confuse Eve. In the second phase, Alice transmits her information signal to Bob along with an amplified version of the AN signal to confuse Eve. Our numerical results show that the proposed scheme can efficiently power Alice while securing her transmissions. Moreover, we show that the achieved average secrecy rate under the proposed scheme outperforms the case when the conventional communication scheme is employed.

DOI: 10.1109/lwc.2017.2728794

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