Abstract
Simultaneous wireless information and power transfer (SWIPT) is a major breakthrough in the field of low-power wireless information transmissions. In this paper, the secrecy performance of the SWIPT-enabled relay network with full-duplex destination-aided jamming is assessed, where both the power-splitting (PS) and time-switching (TS) schemes at the relay are considered with the linear and nonlinear energy harvesting models. The relay harvests energy from the confidential signal and artificial noise sent by the source and destination, respectively, and forwards the amplified signal to the destination, in the presence of an eavesdropper. The analytical closed-form expressions of the connection outage probability (COP), secrecy outage probability (SOP), and transmission outage probability (TOP) for PS- and TS-based schemes are derived, and the closed-form expression of the lower bound of ergodic secrecy capacity (ESC) is calculated. The asymptotic-form expressions of the COP, SOP, TOP, and ESC are further analyzed to capture the valuable information in the high SNR regime. Numerical results verify the correctness of analytical results, reveal the effects of the PS/TS ratio, and transmit the signal-to-noise ratio on secrecy performance.
Highlights
Wireless communication networks greatly facilitate our daily lives with the explosive growth of smart phones, wireless laptops, and tablet computers
Signals in simultaneous wireless information and power transfer (SWIPT) systems are vulnerable to malicious attacks due to the strong signal power as well as the open nature of the wireless channel, which results in concerns about the security issue. erefore, a lot of studies have been performed to prevent the leakage of private information, and physical layer security (PLS) has been proved to be one of the most effective solutions to improve the security of SWIPT systems [11]. e pivotal character of PLS is to utilize the intrinsic secrecy properties of wireless channels, which can help to realize the secure communication in SWIPT [12,13,14,15]
For the linear EH (LEH) one, the original connection outage probability (COP) keeps decreasing with the signalto-noise ratios (SNRs) ascending until it converges to an exact value. e reason for the different variations of COP under the two energy harvesting (EH) models is that the information signal has a greater positive effect on the destination at first and benefits the reliability, while with the further rising of transmit SNR, the negative effect of the interference signal becomes more pronounced, which is reflected in the fact that the curve either reverses change or keeps equilibrium, after reaching the extreme value
Summary
Wireless communication networks greatly facilitate our daily lives with the explosive growth of smart phones, wireless laptops, and tablet computers. To obtain the maximum secrecy rate by optimizing the power allocation and AN-aided transmission, a SWIPT system, composing of an eavesdropper, a source, and several users, was investigated in [16], where the source acts as a cooperative jammer as well Legitimate communication partners, such as the relay, can act as a jammer in the SWIPT network. In our previous study [22], an FD destination-assisted jamming scheme was adopted in a SWIPT-enabled trusted relay network, and the optimization problem was designed to achieve the optimal secrecy capacity, where only the PS scheme with the linear EH (LEH) model was considered. In this paper, the secrecy performance of a SWIPT-enabled four-node wiretap network with an amplify-and-forward (AF) relay and a destination with jamming is investigated.
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