Paper Info
Title
Joint subcarrier and power allocation for physical layer security in cooperative OFDMA networks.
Abstract
In this paper, a joint subcarrier and power allocation algorithm is proposed to improve the physical layer security in cooperative orthogonal frequency division multiple access (OFDMA) networks, where several source-destination pairs and one untrusted relay are involved. The relay is friendly and intends to help these pairs to enhance their communications. However, it may be overheard by a malicious eavesdropper at the same time. To optimize the joint subcarrier and power allocation with low complexity, we divide the optimization problem into two simpler subproblems. Firstly, the subcarriers are assigned to the source-destination pairs by employing the dual approach under the assumption that the relay power is equally allocated to all the subcarriers. Then, the relay power is allocated to the subcarriers based on the alternative ascending clock auction mechanism. In addition, we prove that the two subproblems can converge after a finite number of iterations. We also find that the proposed auction is cheat-proof and, thus, can avoid the cheating behaviors in the auction process. Numerical results demonstrate that our proposed algorithm can effectively improve the system sum secrecy rate, and the convergence performance is also desirable. © 2013 Liao et al.; licensee Springer.
Year
DOI
Venue
2013
10.1186/1687-1499-2013-193
EURASIP J. Wireless Comm. and Networking
Keywords
Field
DocType
auction,cooperative ofdma,dual,physical layer security,resource allocation
Subcarrier,Convergence (routing),Computer science,Secrecy,Computer network,Orthogonal frequency-division multiple access,Physical layer,Resource allocation,Optimization problem,Relay
Journal
Volume
Issue
ISSN
2013
1
16871499
Citations 
PageRank 
References 
14
0.44
13
Authors
6
Name
Order
Citations
PageRank
An Wang1140.44
Jin Chen2162.29
Yueming Cai3918102.96
Chunxiao Cai4554.80
Wendong Yang510010.22
Yunpeng Cheng6858.84