Optimal Power Allocation for Secure Multicarrier Relay Systems

The authors study power allocation for secrecy rate maximization in a multicarrier decode-and-forward relay system, where an eavesdropper exists. They 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 broadcasts signals during the first time slot and the relay forwards the reen-coded signals to the destination during the second time slot. Determining the transmission strategy adaptively on each subcarrier, 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.

Provided by: Institute of Electrical & Electronic Engineers Topic: Networking Date Added: Nov 2011 Format: PDF

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