Abstract
Considering a nonregenerative untrusted relay network, we investigate three different secure transmission strategies, for example, noncooperative strategy, conventional amplify-and-forward (AF) strategy, and cooperative jamming (CJ) strategy. To thoroughly assess the secrecy performance achieved by the three strategies, we derive the closed-form expressions for the connection outage probability and secrecy outage probability regarding each strategy. Based on these expressions, the reliability and security tradeoff (RST) is examined to facilitate the design of the transmitting parameters. We then present the closed-form expression for the effective secrecy throughput (EST) and characterize the overall efficiency of these transmission strategies. Furthermore, we conduct the asymptotic analysis for the secrecy throughput, which enables us to determine the optimal transmission strategy under different scenarios. Our analytical and numerical results demonstrate that compared with the noncooperative and AF strategies, the CJ strategy possesses the best performance in terms of RST. Additionally, we also find that the EST performance of the AF strategy is nearly invariable when the quality of the second hop changes.
Highlights
Due to the broadcast nature of the open medium, wireless communication systems are vulnerable to security attacks
The aforementioned contributions only focused on secrecy rate and outage performance without paying much attention to the reliability and security tradeoff (RST) and effective secrecy throughput (EST) performance
We observe that as the transmit power increases, for each strategy the COP is reduced whereas the corresponding SOP increases. This demonstrates that the reliability and security tradeoff between COP and SOP exists in the untrusted relay network
Summary
Due to the broadcast nature of the open medium, wireless communication systems are vulnerable to security attacks. Considering the practical working condition, the design of secure transmission scheme under channel state information (CSI) uncertainty has already been studied by [10,11,12] with eavesdropper. The aforementioned contributions only focused on secrecy rate and outage performance without paying much attention to the reliability and security tradeoff (RST) and effective secrecy throughput (EST) performance. This motivates us to explore the secrecy coding aided secure wireless communications to achieve the reliability and security tradeoff, where the reliability is quantified in terms of the connection outage probability, while the security is quantified in terms of the secrecy outage probability [23]. We find that the EST of the AF strategy is not sensitive to the channel coefficient of the second hop
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