Secrecy in Wireless Information and Power Transfer for One-Way and Two-Way Untrusted Relaying with Friendly Jamming

Abstract

An untrusted relay system combined with a simultaneous wireless information and power transfer (SWIPT) scheme is considered in one-way and two-way relaying transmission strategies. In the system, two source nodes can only communicate with each other via an untrusted energy harvesting relay node, which sends the message by using its harvested energy from the source nodes. Specifically, we classify the intermediate relay as an eavesdropper into two modes: active eavesdropper and nonactive eavesdropper, depending on whether it has sufficient energy of its own to transmit the message or not. Under a simplified three-node fading wiretap channel setup, the transmit power allocation and power splitting ratio are jointly optimized to minimize the outage probability in the delay-sensitive case and to maximize the average rate in the delay-insensitive case, subject to the average and peak total power constraints. Applying the dual-decomposition method, the optimization problem can be efficiently solved in the delay-sensitive scenario. Moreover, an iterative algorithm is proposed to derive the solution to maximize the average rate in the delay-insensitive scenario. Numerical results demonstrate the performance of system outage probability in the two modes versus different rates and how efficiently the secrecy rate is improved compared with traditional schemes.

A Comprehensive Survey on Cooperative Relaying and Jamming Strategies for Physical Layer Security

“…In contrast, for the case of imperfect CSI, a suboptimal rank algorithm was provided. Xiao et al in [272] studied two eavesdropping conditions of untrusted relay, i.e. active eavesdropping and non-active eavesdropping.…”

Security and reliability performance analysis for two‐way wireless energy harvesting based untrusted relaying with cooperative jamming

“…Therefore, deploying a wireless‐powered relay or even multiple relays might be regarded as a promising solution for successful and energy efficient end‐to‐end transmission. It is also worth noting that the lack of direct link between source and destination is a widely adopted and valid assumption in numerous real‐world wireless communication scenarios based on relaying [10, 15, 19, 23].…”

“…We also assume that all the network nodes are configured with a single antenna and operate in half‐duplex mode with the same frequency band as in [19, 23–25]. [Note that this work can be extended to consider large‐scale antennas at every node based on the required application, which further eventuates considering correlated channels within each link, due to the utilisation of multiple antennas and even correlated shadowing channels between nodes as in [28, 29], especially when it comes to the application of wireless EH wherein network nodes should be close enough to make a promising EH performance.…”

“…The key idea behind SWIPT is that a wireless node can capture radio‐frequency (RF) signals sent by a source node and then transform them into direct current to charge the node's rechargeable battery to the extent that it further can make use of it for signal processing or information transmission (IT) [14]. In recent years, great efforts have been dedicated to the study of SWIPT for non‐security‐based [15, 16] and security‐based systems [17–26]. Nasir et al .…”

“…Xiao et al . [23] investigated a SWIPT scheme for a one‐way and two‐way untrusted relaying system with different modes at the relay side as an eavesdropper and examined the outage probability. Yan et al investigated the security and reliability of an energy‐harvesting underlay cognitive radio system in the presence of multiple eavesdroppers and proposed an energy‐aware scheme to improve the PLS of the considered scenario in [24].…”