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Energy savings are becoming a global trend, hence the importance of Energy Efficiency (EE) as an alternative performance evaluation metric. This paper proposes an EE based resource allocation method for the Broadcast Channel (BC), where a linear power model is used to characterize the power consumed at the Base Station (BS). Having formulated the EE based optimization problem and objective function, the authors utilize standard convex optimization techniques to show the concavity of the latter, and thus, the existence of a unique globally optimal energy-efficient rate and power allocation.
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