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Mobile Information Systems
Volume 2017 (2017), Article ID 2192606, 10 pages
https://doi.org/10.1155/2017/2192606
Research Article

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

1Information Engineering School, Nanchang University, Nanchang, China
2Information Systems Research Centre, Macao Polytechnic Institute, Rua de Luis Gonzaga Gomes, Macau

Correspondence should be addressed to Dingcheng Yang; moc.nsm@nauynauxcdy

Received 18 January 2017; Revised 12 May 2017; Accepted 2 July 2017; Published 10 August 2017

Academic Editor: Stefania Sardellitti

Copyright © 2017 Lin Xiao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.