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This paper develops a unified approach to obtain optimal transmission schedule for an energy-harvesting node with non-ideal circuit power consumption. For both time-invariant and time-varying fading channels, we show that the optimal transmission between any two consecutive channel or energy state changing time, termed epoch, can only take one of the three strategies: (i) no transmission, (ii) transmission...
We consider a cognitive radio network where secondary cognitive users communicate with an access point relying on opportunistic transmissions over wireless fading channels. For such a network, it is important to maximize aggregate utility of average user rates under the constraints of average user power budgets and maximum allowable probabilities of collisions with the primary communications. To this...
We consider joint optimization for sensing-channel selection and ensuing power control problem with cognitive radios over time-varying fading channels. It is shown that this joint design can be judiciously formulated as a convex optimization problem. Optimal joint sensing-channel selection and power control scheme is then derived in closed-form under the constraints of average power budget and maximum...
In this paper we develop the jointly optimal sensing-channel selection and power control scheme for cognitive communications over time-varying fading wireless channels. With judicious formulation, it is shown that this joint design can become a convex optimization problem. Optimal scheme is then derived in closed-form under the constraints of average power budget and maximum allowable probability...
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