Abstract
In this paper, we evaluate system performances of a multi-hop relay protocol with presence of an active eavesdropper. In the proposed protocol, a source attempts to transmit its data to a destination with assistance of multiple intermediate relays. From the eavesdropping Channel State Information (CSI) estimated, the source and relays adjust their transmit power so that the eavesdropper cannot overhear the transmitted data. Moreover, to enhance throughput for the proposed system, Non-Orthogonal Multiple Access (NOMA) technique with a simple power allocation is also proposed. We derive exact closed-form expressions of the Outage Probability (OP) and throughput for the data transmission over Rayleigh fading channel. In addition, when the CSI estimation is imperfect, Intercept Probability (IP) at the eavesdropper is derived. Finally, Monte Carlo simulations are presented to verify the theoretical derivations.
Highlights
Non-Orthogonal Multiple Access (NOMA) technique [1], [2], [3] and [4] has gain much attention as an efficient method to significantly improve the data rate for wireless communication systems
Different from the previous published works [9] and [10], this paper considers a multi-hop relay network, in which a source uses NOMA to transmit its data to a destination via multiple intermediate relays, in presence of an active eavesdropper
Without using NOMA, throughput of the data link is calculated by Outage Probability (OP) of the data link can be expressed by an exact closed-form expression as λE,k γth k=1 λE,kγth + τ σ02λD,k
Summary
Non-Orthogonal Multiple Access (NOMA) technique [1], [2], [3] and [4] has gain much attention as an efficient method to significantly improve the data rate for wireless communication systems. In the physical-layer security, the physical properties of the wireless channel such as Channel State Information (CSI) and distances of the connection links can be used to protect the transmitted data. Different from the previous published works [9] and [10], this paper considers a multi-hop relay network, in which a source uses NOMA to transmit its data to a destination via multiple intermediate relays, in presence of an active eavesdropper. To avoid the eavesdropper from overhearing the transmitted data, the transmitters including the source and relays attempt to estimate the Channel State Information (CSI) between themselves and the eavesdropper, and adjust their transmit power appropriately. Because the eavesdropper is an active node, the source and relay nodes attempt to estimate Channel State Information (CSI) between themself and the node E. Where dk and lk are distances of the Nk−1 → Nk and Nk−1 → E links, respectively, and β is path-loss exponent
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