Subcarrier Allocation for Physical-Layer Security in Cooperative OFDMA Networks

Secrecy on the physical layer is receiving increased research interest due to its theoretical and practical importance. In this letter, a subcarrier allocation scheme is proposed for physical-layer security in cooperative orthogonal frequency division multiple access (OFDMA) networks that use the Amplify-and-Forward (AF) strategy. We consider the subcarrier pairing and assignment to maximize overall system rates subject to a secrecy level requirement. Monte Carlo simulations are carried out to validate our analysis.

[1]  A. D. Wyner,et al.  The wire-tap channel , 1975, The Bell System Technical Journal.

[2]  John S. Thompson,et al.  Relay selection for secure cooperative networks with jamming , 2009, IEEE Transactions on Wireless Communications.

[3]  Claude E. Shannon,et al.  Communication theory of secrecy systems , 1949, Bell Syst. Tech. J..

[4]  H. Vincent Poor,et al.  Physical layer secrecy for OFDM systems , 2010, 2010 European Wireless Conference (EW).

[5]  Wei Yu,et al.  Dual methods for nonconvex spectrum optimization of multicarrier systems , 2006, IEEE Transactions on Communications.

[6]  Athina P. Petropulu,et al.  Secrecy rate optimization under cooperation with perfect channel state information , 2009, 2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers.

[7]  Miguel R. D. Rodrigues,et al.  Secrecy Capacity of Wireless Channels , 2006, 2006 IEEE International Symposium on Information Theory.

[8]  Raj Jain,et al.  A Quantitative Measure Of Fairness And Discrimination For Resource Allocation In Shared Computer Systems , 1998, ArXiv.

[9]  Meixia Tao,et al.  Power and Subcarrier Allocation for Physical-Layer Security in OFDMA Networks , 2011, 2011 IEEE International Conference on Communications (ICC).

[10]  H. Kuhn.  The Hungarian method for the assignment problem , 1955 .

[11]  Stephen P. Boyd,et al.  Convex Optimization , 2004, Algorithms and Theory of Computation Handbook.

[12]  A. Robert Calderbank,et al.  Secrecy capacity of a class of orthogonal relay eavesdropper channels , 2009 .