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Appl. Sci. 2017, 7(5), 520; doi:10.3390/app7050520

Joint Resource Allocation in Secure OFDMA-Based Networks Taking a Base Station as a Two-Way Relay

1,2,* , 1
and
1
1
College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
2
Department of Mathematics and Information Engineering, Dongchang College of Liaocheng University, Liaocheng 252000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Christos Bouras
Received: 21 March 2017 / Revised: 28 April 2017 / Accepted: 12 May 2017 / Published: 21 May 2017
(This article belongs to the Section Computer Science and Electrical Engineering)
View Full-Text   |   Download PDF [793 KB, uploaded 21 May 2017]   |  

Abstract

Due to the broadcast nature of wireless media, all nodes in the coverage of a transmitter are capable of capturing its signals, thus wireless transmission is sensitive to wiretapping. Several existing schemes place an emphasis on secrecy rate improvement, under the protocols of amplify-and-forward or decode-and-forward, when there are only relay users in the network. We set up a novel communication model in which normal and two-way relay users coexist in the same cell, taking the base station as a relay. Our objective is to maximize the total secrecy rate, taking subcarrier pairing, subcarrier assignment and power allocation into account, when there is one eavesdropper in one cell of the cellular network. Although this problem is very intricate, we reformulate it as a convex optimization problem by means of Lagrange duality. In order to reduce the computational complexity, equal power allocation is proposed. Lastly, the experimental results show the proposed resource allocation scheme can obtain a higher secrecy rate than traditional schemes. View Full-Text
Keywords: secrecy rate; two-way relay; joint resource allocation secrecy rate; two-way relay; joint resource allocation
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Du, N.; Liu, F.; Zang, Y. Joint Resource Allocation in Secure OFDMA-Based Networks Taking a Base Station as a Two-Way Relay. Appl. Sci. 2017, 7, 520.

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