The paper focuses on investigating secure transmission in wireless powered communication networks (WPCN) that involve multiple energy-constrained relays and one energy-constrained source.The energy is harvested from a power beacon (PB) while operating in the presence of a passive eavesdropper.The study primarily aims to achieve energy-efficient secure communications by examining the impact of channel estimation on the secrecy performance of WPCN under both perfect and imperfect CSI scenarios.To obtain practical insights on improving security and energy efficiency, we propose closed-form expressions for secrecy outage probability (SOP) under the linear energy harvesting (LEH) model of WPCN.Furthermore, we suggest a search method to optimize the secure energy efficiency (SEE) with limited power from PB.The research emphasizes the significance of channel estimation in maintaining the desired performance levels in WPCN in real-world applications.The theoretical results are validated through simulations to ensure their accuracy and reliability.
The paper focuses on investigating secure transmission in wireless powered communication networks (WPCN) that involve multiple energy-constrained relays and one energy-constrained source.The energy is harvested from a power beacon (PB) while operating in the presence of a passive eavesdropper.The study primarily aims to achieve energy-efficient secure communications by examining the impact of channel estimation on the secrecy performance of WPCN under both perfect and imperfect CSI scenarios.To obtain practical insights on improving security and energy efficiency, we propose closed-form expressions for secrecy outage probability (SOP) under the linear energy harvesting (LEH) model of WPCN.Furthermore, we suggest a search method to optimize the secure energy efficiency (SEE) with limited power from PB.The research emphasizes the significance of channel estimation in maintaining the desired performance levels in WPCN in real-world applications.The theoretical results are validated through simulations to ensure their accuracy and reliability.
This paper investigates secure transmission in a wireless powered communication network (WPCN) with an energy harvesting (EH) source configured with multiple antennas. In the WPCN, the EH source harvests energy from the radio frequency (RF) signals broadcasted by a power beacon (PB), and purely relies on the harvested energy to communicate with the destination in the presence of passive eavesdroppers. It is noteworthy that the RF-EH source is equipped with a finite energy storage to accumulate the harvested energy for the future usage. Moreover, due to energy-constraint and complexity- limitation, the multi-antenna source is only configured with a single RF-chain. To enhance the security for the WPCN, we propose two adaptive transmission schemes, i.e., energy-aware transmit antenna selection (EATAS) and energy-aware differential spatial modulation (EADSM). According to the energy status and the channel quality, the source adaptively decides whether to transmit confidential information or harvest RF energy. To evaluate the secrecy performance of the proposed schemes, we first study the evolution of the energy storage, and then derive the analytical expressions of connection outage probability (COP), secrecy outage probability (SOP) and efficient secrecy throughput (EST). Numerical results demonstrate that our proposed schemes outperform the existing schemes, i.e., time-switching based TAS (TS-TAS) and accumulate-then-transmit (ATT). And, increasing the transmit power of the PB or the capacity of the source's energy storage is helpful to improve the secrecy performance. Moreover, there exists an optimal transmission rate for each proposed scheme to achieve best secrecy performance.
This paper investigates secure transmission in a wireless powered communication network (WPCN) with an energy harvesting (EH) source configured with multiple antennas. In the WPCN, the EH source harvests energy from the radio frequency (RF) signals broadcasted by a power beacon (PB), and purely relies on the harvested energy to communicate with the destination in the presence of passive eavesdroppers. It is noteworthy that the RF-EH source is equipped with a finite energy storage to accumulate the harvested energy. To enhance the security, we propose an energy-aware transmit antenna selection (EATAS) scheme. According to the energy status and the channel quality, the source adaptively decides to transmit confidential information or harvest RF energy. For evaluating the secrecy performance, we first study the evolution of the energy storage, and then derive the analytical expressions of connection outage probability (COP), secrecy outage probability (SOP) and effective secrecy throughput (EST). Numerical results demonstrate that our proposed scheme outperforms the existing accumulate-then-transmit (ATT) scheme.
In this paper, we investigate the secrecy performance of wireless powered communication networks (WPCNs) faced by multiple passive eavesdroppers, where the full-duplex (FD) receiver utilizes the harvested energy to send the artificial jamming for enhancing the secrecy performance. Moreover, we adopt a practical maximal ratio transmission (MRT) scheme at the transmitter taking into account the impact of imperfect CSI to try to improve the transmission efficiency of the considered system. Specifically, in order to evaluate the proposed scheme, three important performance metrics, namely, connect outage probability (COP), secrecy outage probability (SOP), and secrecy throughput are adopted in this paper. Concretely, the exact and asymptotic expressions for COP, SOP, and secrecy throughput were derived to effectively analyze the impact of key parameters on the system performance more comprehensively. Through the simulation analysis, we can find that the proposed energy harvesting-based FD-aid jamming (EHFDJ) scheme can achieve better secrecy performance than the reduced half-duplex non-jamming (HDNJ) scheme under a relatively small self-interference.
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.
Power Beacon (PB)-assisted short packet wireless networks refer to systems where energy limited transmitters first harvest wireless power from a dedicated PB before transmitting short confidential data packets under strict latency constraints. In this paper, we explore the secrecy performance of such networks in the presence of multiple eavesdroppers. Specifically, we develop a novel closed form mathematical expression for the ergodic secrecy capacity (ESC) over Nakagami-m fading channels, which captures the joint effect of wireless energy transfer and fading dynamics. The accuracy of the analytical findings is further validated through Monte-Carlo simulations, showing excellent agreement with the theoretical results. Our results demonstrate that optimizing the fading parameters and channel configurations significantly enhances secrecy capacity, particularly at high transmit signal-to-noise ratio (SNR), while also revealing the existence of an optimal energy harvesting length for secure transmission. This study not only establishes a solid theoretical foundation for secrecy in PB-assisted short packet systems but also provides valuable guidelines for designing secure, ultra reliable, and energy efficient Internet of Things (IoT) and wireless networks.
In this paper, the secrecy performance of a wireless-powered multi-antenna relaying system, which consists of a source(S), a destination(D),N(N>1)relays (Rs), a power beacon(B), and an eavesdropper(E), is studied in the presence of imperfect channel state information at Rs. Both S and Rs are assumed to be with nonlinear energy harvesters, and harvest energy from radio-frequency signals from B through a time-switching harvesting scheme. Assuming Rs deploy decode-and-forward scheme, a generalKth best relay in terms of instantaneous secrecy capacity for S-R-D link is selected for information transmission. An analytical expression for secrecy outage probability (SOP), validated via Monte Carlo simulation, is derived when all channels experience independent Rayleigh fading. Numerical results show that a higher correlation coefficient between the estimated and real channel values leads to better SOP performance when the ratio of the channel gains of R-D and R-E links is in the high region for the first hop or in the low-to-medium region for the second hop. Furthermore, there exists a special value of the saturation threshold of the energy harvester at S or R, and SOP performance cannot be improved when the saturation threshold is beyond that value.