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Physical-layer security can offer confidential communications from an information-theoretic viewpoint. This letter focuses on the secrecy rate optimization in presence of an eavesdropper, investigating the cases of direct and cooperative communications. Particularly, the problem of joint power and confusion rate management to provide optimal secrecy rate under admissible information leakage is studied...
In this paper, we investigate the optimal allocation of the power in the downlink cooperative cognitive radio network using decode and forward (DF) relaying techniques. The power allocation in DF relaying for green cognitive radio with objective of maximizing energy efficiency is a constraint nonlinear non-convex fractional programming (CNNFP) problem. We present the optimal power allocation in DF...
In this paper, we have focused on orthogonal non-regenerating cooperation for networks with a source-destination pair and a number of relay nodes. We proposed two power allocation problems based on the instantaneous and average information about the channel gains to maximize either the instantaneous or average signal-to-noise ratio at the destination. We also assumed that the network total energy...
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