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Optimal Power Allocation for Secure Multicarrier Relay Systems

Optimal Power Allocation for Secure Multicarrier Relay Systems,10.1109/TSP.2011.2162956,IEEE Transactions on Signal Processing,Cheol Jeong,Il-Min Kim

Optimal Power Allocation for Secure Multicarrier Relay Systems   (Citations: 1)
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We study power allocation for secrecy rate maximiza- tion in a multicarrier decode-and-forward relay system, where an eavesdropper exists. We consider three transmission modes: in no communication, the source and the relay do not transmit at all; in direct communication, the source broadcasts signals during the first time slot and the relay does not forward any signal during the second time slot; in relay communication, the source broad- casts signals during the first time slot and the relay forwards the reencoded signals to the destination during the second time slot. Determining the transmission strategy adaptively on each subcar- rier, the optimal source power and the optimal relay power over all subcarriers are derived to maximize the sum secrecy rate under a total system power constraint. In addition, a suboptimal power allocation scheme is proposed to substantially reduce the compu- tational complexity. It is shown that the proposed suboptimal so- lution is asymptotically optimal in the limit as the number of sub- carriers goes to infinity. Extensive numerical results are presented for various scenarios. In particular, the performance of the subop- timal scheme is very close to tha to f the optimal scheme even if the number of subcarriers is moderately small.
Journal: IEEE Transactions on Signal Processing - TSP , vol. 59, no. 11, pp. 5428-5442, 2011
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