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In this paper, the authors consider the power allocation of a single-link wireless communication with joint energy harvesting and grid power supply. They formulate the problem as minimizing the grid power consumption with random energy and data arrival, and analyze the structure of the optimal power allocation policy in some special cases. For the case that all the packets are arrived before transmission, it is a dual problem of throughput maximization, and the optimal solution is found by the two-stage Water Filling (WF) policy, which allocates the harvested energy in the first stage, and then allocates the power grid energy in the second stage.
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