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In energy-constrained wireless networks such as sensor networks, it is important to maximize power efficiency by minimizing power consumption for a given quality of service such as the data rate; it is equally important to evenly or fairly distribute power consumption to all nodes to maximize the network life. In this paper, we develop optimal power control methods to balance the tradeoff between...
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...
In practical orthogonal frequency division multiplexing (OFDM) systems, subcarriers are grouped into chunks and a chunk of subcarriers is regarded as the minimum unit for subcarrier allocation. We consider the optimal chunk assignment that maximizes a utility function of average user rates for a wireless OFDM system under different power control policies. It is shown that the optimal schemes adopt...
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