The secrecy performance of wireless networks powered up by a dedicated power beacon (PB) is addressed in this work. Particularly, the closed-form expression of the secrecy outage probability (SOP) under the presence of multiple eavesdroppers is given. The considered networks are asymmetric since there are multiple eavesdroppers but only a single legitimate receiver. As a consequence, two wiretap schemes are employed, namely, non-colluding and colluding schemes, to take advantage of multiple eavesdroppers. To draw insights from the derived framework, the asymptotic framework of the SOP under the high transmit power regime is also provided. Next, Monte Carlo simulations are provided to validate the theoretical foundations of the proposed approach. Our findings show that by increasing the transmit power from −10 dB to 30 dB, the SOP ameliorates almost a thousand times. Additionally, the SOP is a monotonic decreasing function with a time-switching ratio. We also make comparisons with work in the literature in which the full-duplex relay is employed to help the legitimate link. Numerical results illustrate that the proposed network outperforms those described in the literature. Particularly, through reliance on the setup, the SOP under the proposed system is better than those of the literature by about twofold.
The secrecy performance of wireless networks powered up by a dedicated power beacon (PB) is addressed in this work. Particularly, the closed-form expression of the secrecy outage probability (SOP) under the presence of multiple eavesdroppers is given. The considered networks are asymmetric since there are multiple eavesdroppers but only a single legitimate receiver. As a consequence, two wiretap schemes are employed, namely, non-colluding and colluding schemes, to take advantage of multiple eavesdroppers. To draw insights from the derived framework, the asymptotic framework of the SOP under the high transmit power regime is also provided. Next, Monte Carlo simulations are provided to validate the theoretical foundations of the proposed approach. Our findings show that by increasing the transmit power from −10 dB to 30 dB, the SOP ameliorates almost a thousand times. Additionally, the SOP is a monotonic decreasing function with a time-switching ratio. We also make comparisons with work in the literature in which the full-duplex relay is employed to help the legitimate link. Numerical results illustrate that the proposed network outperforms those described in the literature. Particularly, through reliance on the setup, the SOP under the proposed system is better than those of the literature by about twofold.
In this paper, we present a comprehensive secrecy performance analysis of wireless powered communication networks with multiple eavesdroppers, where an energy-limited information source with multiple antennas harvests the radio frequency energy from a dedicated power beacon (PB) before transmission. To exploit the benefits of multiple antennas at source, two popular multi-antenna transmission schemes, i.e., maximal ratio transmission and transmit antenna selection, are investigated for two intercepting ways at Eves, i.e., non-colluding and colluding scenarios, respectively. Specifically, adopting the time-switching protocol at PB, we derive exact closed-form expressions of the secrecy outage probability and the average secrecy rate for both two transmission schemes taking into account the outdated channel state information. Furthermore, in order to deeply extract insights on the system design, we further present tractable asymptotic secrecy outage probability and ergodic secrecy capacity at high signal-to-noise ratio regimes, which easily enable us to obtain the secrecy diversity order and coding gain of two transmission schemes, respectively. From our analysis, several important concluding remarks are obtained as follows: 1) full secrecy diversity order can be achieved by both two transmission schemes with no feedback delay, however, it reduces to one in the presence of feedback delay; 2) as the number of eavesdroppers increases, the secrecy performance gap between non-colluding and colluding scenarios becomes large; and 3) maximal ratio transmission (MRT) scheme always outperforms transmit antenna selection (TAS) scheme with no feedback delay. However, TAS scheme achieves a similar performance as MRT scheme or even better in moderate and even serious feedback delay conditions.
In this paper, we present a secrecy outage performance analysis of wireless powered communication networks with multiple eavesdroppers, where an energy-limited information source with multiple antennas harvests the radio frequency (RF) energy from a dedicated power beacon (PB) before transmission. To exploit the benefits of multiple antennas at source, two popular multi-antenna transmission schemes, i.e., maximal ratio transmission and transmit antenna selection, are investigated for two intercepting ways at Eves, i.e., non-colluding and colluding scenarios, respectively. Specifically, adopting the time-switching protocol at PB, we derive exact and asymptotic closed-form expressions of the secrecy outage probability for both two transmission schemes taking into account the outdated channel state information (CSI). From our analysis, several important concluding remarks are obtained as follows: a) Full secrecy diversity order can be achieved by both two transmission schemes with no feedback delay, however, it reduces to zero in the presence of feedback delay; b) MRT scheme always outperforms TAS scheme with no feedback delay. However, TAS scheme achieves a similar performance as MRT scheme or even better in moderate and even serious feedback delay conditions.
This paper investigates the physical-layer secure performance of a multi-power beacon-empowered wirelessly powered communication system in the surveillance of an external eavesdropper. Specifically, a limited-energy source harvests energy from multiple dedicated power beacons in the first time slot and reuses it to perform data transmission in the second time slot. However, its communication with the destination is wiretapped by a potentially idle untrusted user. Thus, to evaluate the secure performance of the considered system, we have derived closed-form expressions for the secrecy outage probability (SOP) metric in terms of both exact and asymptotic aspects. Through these formulas, we then provide a series of numerical discussions on how to configure the number setting of the power beacon, the energy harvesting parameters as well as scheduling time to improve the SOP performance, where the Monte-Carlo simulation method is used to verify the developed mathematical framework.
This paper analyzes the secure outage performance of a power beacon (PB)-assisted wireless network employing short packet communication. We consider a system where an EH transmitter communicates with a legitimate receiver under the threat of multiple eavesdroppers. We derive closed-form expressions for key secrecy metrics: the probability of nonzero secrecy capacity (PNSC), intercept probability, and secure outage probability (SOP) over Nakagami-mfading channels. Our analysis delineates the joint impact of the transmit signal-to-noise ratio (SNR), fading severity, channel parameters, the number of eavesdroppers, and additionally demonstrates how energy conversion efficiency of the harvesting circuit influences secrecy behavior in practice. The analytical findings are further validated through Monte-Carlo simulations, which confirm the accuracy of the derived expressions. The findings demonstrate that strategic system design, particularly strengthening the main channel in a proper way, improving harvesting duration, and ensuring efficient energy conversion, can effectively mitigate eavesdropping risks and ensure confidentiality. This work provides critical aspects for securing future energy constrained Internet of Things (IoT) networks where short packets and robust data privacy are essential.
This paper considers a wirelessly powered wiretap channel, where an energy constrained information source, powered by a dedicated power beacon, communicates with a legitimate user in the presence of a passive eavesdropper. The source is assumed to have multiple antennas, while the other three nodes are equipped with a single antenna each. Considering a simple time-switching design where power transfer and information transmission are separated in time. We investigate two popular transmission schemes, namely maximum ratio transmission (MRT) and transmit antenna selection (TAS). Closed-form expressions are derived for the achievable secrecy outage probability of both schemes. In addition, simple approximations are obtained at the high signal-to-noise ratio (SNR) regime. Our results demonstrate that the more channel state information (CSI) available, the better the secrecy performance. For instance, with full CSI of the main channel, the system can achieve substantial secrecy diversity gain. On the other hand, without the CSI of the main channel, no diversity gain can be attained. Finally, our theoretical claims are validated by the numerical results.
In this paper, we addressed improving the physical layer security (PLS) of an energy harvest- ing (EH)-based wireless network composed of a source node, which is operated by the harvested energy from the power beacon and sends secure information to a destination in the presence of an eavesdropper and a cooperative jammer (CJ). In particular, we provided an explicit transmit design for minimizing the secrecy outage probability (SOP), subject to a minimum secrecy rate constraint. The results show that support from a friendly jammer can significantly improve the reliabil- ity and security performance of the system. Addition- ally, we described the effects of particular factors on the optimal possible temporal distribution between informa- tion transmission and energy harvesting. As a result, when considering the SOP, we concluded that there ex- ists an optimal value of the time switching factor for the system to function well. The analytical formulas were verified by Monte Carlo simulation.