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Minimizing energy and power consumption in wireless sensor networks is critical in extending the lifetime of the network. In this paper the authors consider efficient power/rate allocation strategies with certain quality of service constraints. The transmission rate achieved and the power used are related by a power-rate function for a given channel state. Specifically, two problems are formulated, one seeking to minimize the average power consumption subject to an average rate constraint, while the other seeking to maximize the average data rate subject to an average power constraint.
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