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Mobile Information Systems
Volume 2017 (2017), Article ID 7843843, 12 pages
Research Article

A Novel Secure Transmission Scheme in MIMO Two-Way Relay Channels with Physical Layer Approach

1State Key Lab of ISN, Xidian University, Xi’an, Shaanxi, China
2Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada

Correspondence should be addressed to Qiao Liu

Received 20 October 2016; Revised 24 December 2016; Accepted 29 December 2016; Published 2 March 2017

Academic Editor: Jing Zhao

Copyright © 2017 Qiao Liu 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.


Security issue has been considered as one of the most pivotal aspects for the fifth-generation mobile network (5G) due to the increasing demands of security service as well as the growing occurrence of security threat. In this paper, instead of focusing on the security architecture in the upper layer, we investigate the secure transmission for a basic channel model in a heterogeneous network, that is, two-way relay channels. By exploiting the properties of the transmission medium in the physical layer, we propose a novel secure scheme for the aforementioned channel mode. With precoding design, the proposed scheme is able to achieve a high transmission efficiency as well as security. Two different approaches have been introduced: information theoretical approach and physical layer encryption approach. We show that our scheme is secure under three different adversarial models: () untrusted relay attack model, () trusted relay with eavesdropper attack model, and () untrusted relay with eavesdroppers attack model. We also derive the secrecy capacity of the two different approaches under the three attacks. Finally, we conduct three simulations of our proposed scheme. The simulation results agree with the theoretical analysis illustrating that our proposed scheme could achieve a better performance than the existing schemes.