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.
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.
Physical layer security is a suitable replacement or complement to the traditional cryptography method for securing a wireless network. Physical layer security exploits the random characteristics of a wireless channel. Deploying multiple relays and a jammer can secure the system performance, however, extra power is required. RF energy harvesting is a promising solution to a wireless network's energy scarcity problem. RF energy is widely available in the environment due to billions of devices broadcasting it. Therefore, a secure, green system model is proposed with a source, destination, energy harvested relaying nodes, energy harvested jammer, power beacon and an eavesdropper. The theoretical analysis and simulations are provided to evaluate the system performance. The results show that when the number of relays increases, the secrecy outage probability of the considered system decreases. In addition, the system with a jammer outperforms that without a jammer, especially in high SNR scenarios. Finally, the energy harvesting time fraction is an important parameter and needs to be designed carefully in a system.
In this letter, we consider a cooperative wireless network consisting of a source, multiple intermediate energy harvesting nodes, and a destination, in the presence of a passive eavesdropper. First, the intermediate nodes use the time switching-based relaying protocol to harvest energy from the source signal. Then, a pair out of intermediate nodes are selected as a relay and a jammer to transmit confidential and jamming signals to the destination and eavesdropper. Under these assumptions, we evaluate the system performance in terms of secrecy outage probability.
In this paper, we study radio frequency energy harvesting (EH) in a wireless sensor network in the presence of multiple eavesdroppers (EAVs). Specifically, the sensor source and multiple sensor relays harvest energy from multiple power transfer stations (PTSs), and then, the source uses this harvested energy to transmit information to the base station (BS) with the help of the relays. During the transmission of information, the BS typically faces a risk of losing information due to the EAVs. Thus, to enhance the secrecy of the considered system, one of the relays acts as a jammer, using harvested energy to generate interference with the EAVs. We propose a best-relay-and-best-jammer scheme for this purpose and compare this scheme with other previous schemes. The exact closed-form expression for the secrecy outage probability (SOP) is obtained and is validated through Monte Carlo simulations. A near-optimal EH time algorithm is also proposed. In addition, the effects on the SOP of key system parameters such as the EH efficiency coefficient, the EH time, the distance between the relay and BS, the number of PTSs, the number of relays, and the number of EAVs are investigated. The results indicate that the proposed scheme generally outperforms both the best-relay-and-random-jammer scheme and the random-relay-and-best-jammer scheme in terms of the secrecy capacity.
In this paper, we have investigated the Half-Duplex (HD) Energy Harvesting (EH) Cooperative Relaying Networks with one source node, one destination node, one intermediate relay and in the presence of the Jammer Against Eavesdropper. We have analyzed the system performance in terms of the integral form expression of secrecy outage probability. In addition, we have investigated the effect of source rate, time switching factor, energy coefficient, and the ratio Ps/N0 on the system performance. Finally, all the mathematical, analytical expressions are verified by Monte Carlo simulation, and the analytical results match well with the simulation ones to convince the correctness of the analytical expression.
Abstract In this paper, we investigate the physical layer security in an energy harvesting (EH) wireless network composed of a user (U) and a base station (BS) in the face of an eavesdropper. The total communication progress is divided into two phases. In the first phase, friendly jammers (Js) powered by a power beacon (PB). And in the remaining phase, the U sends messages to BS with the help of the Js. To improve the physical layer security, we propose an optimal friendly jammer selection (OFJS) scheme and a suboptimal friendly jammer selection (SFJS) scheme depending on the availability and unavailability of channel state information (CSI) for wiretap link. For the purpose of comparison, we present the random friendly jammer selection (RFJS) scheme. We derive the closedform expressions of connection outage probability (COP), secrecy outage probability (SOP) and effective secrecy throughput (EST) for OFJS, SFJS and RFJS schemes over Nakagami-m fading channels to evaluate the system secrecy performance. Numerical results show that the secrecy performance of proposed OFJS and SFJS schemes is better than that of RFJS scheme, demonstrating the advantage of proposed OFJS and SFJS schemes in improving the physical layer security, and moreover, the performance advantage becomes more significant with the increase of the number of Js. Additionally, due to the influence of COP, three schemes reach the same EST upper bound in the high signal-tonoise ratio (SNR) region.
Internet of Things (IoT), which can provide ubiquitous intelligence and pervasive interconnections to a variety of devices, is becoming a vital component of building the intelligent world. In this work we propose a new relay and jammer selection method to improve physical layer security (PLS) and energy efficiency for the IoT network with energy harvesting (EH) devices. In this method, the intermediate nodes are allowed to use time switching (TS) protocol to harvest energy from power transfer stations (PTS). By taking the channel gain between the PTSs and the intermediate nodes into consideration, two intermediate nodes are selected as relay and jammer respectively to transmit confidential and jamming signals to the destination and eavesdropper aiming at minimizing the secrecy outage probability (SOP). We further analyze the secrecy outage of the system and derive the closed-form expression of SOP. Simulation results demonstrate the performance gain of the proposed method.