Secure wireless powered relaying networks: Energy harvesting policies and performance analysis

International Journal of Communication Systems - Tập 30 Số 18 - 2017
Quang Nhat Le1, Dinh‐Thuan Do2, Beongku An3
1Department of Electronics and Computer Engineering, Hongik University, Republic of Korea
2Faculty of Electronics Technology, Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao, Go Vap Dist., Ho Chi Minh City, Vietnam
3Department of Computer and Information Communications Engineering, Hongik University, Republic of Korea

Tóm tắt

SummaryIn this paper, we investigate the problem of secure communication for a scenario, which consists of one pair of source‐destination nodes and one untrusted relay. The source communicates with the destination via the help of energy harvesting–aware untrusted relay, which acts as the helper to forward the source information to the destination; however, the relay also acts as the unintended user to eavesdrop the source information. To keep the source information confidential from untrusted relay, the destination‐assisted jamming technique is deployed. We evaluate the impact of energy harvesting protocols on such a secure communication scenario through the proposed energy transfer protocols, namely, source‐based energy harvesting protocol and maximum energy harvesting protocol. To evaluate the secrecy performance of these proposed schemes, we derive analytical expressions for two important performance metrics including intercept probability and strictly positive secrecy capacity. The numerical analysis reveals the different trade‐off between secure performance and relevant system parameters (i.e., power splitting ratio, time switching ratio, energy conversion efficiency, transmit signal‐to‐noise ratio, and relay location). Simulation results are also provided to demonstrate the accuracy of the developed analytical expression.

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International Journal of Communication Systems

Tập 30 Số 18

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