Abstract-This paper considers the power allocation of a single-link wireless communication with joint energy harvesting and grid power supply. We formulate the problem as minimizing the grid power consumption with random energy and data arrival in fading channel, 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. For the random data arrival case, we first assume grid energy or harvested energy supply only, and then combine the results to obtain the optimal structure of the coexisting system. Specifically, the reverse multi-stage WF policy is proposed to achieve the optimal power allocation when the battery capacity is infinite. Finally, some heuristic online schemes are proposed, of which the performance is evaluated by numerical simulations. Index Terms-Energy harvesting and power grid coexisting, convex optimization, two-stage water filling, reverse multi-stage water filling.
Given the grid energy budget, a two-stage DWF algorithm was proposed in REF to achieve the optimal throughput with non-causal SI at the transmitter.
Optimal Power Allocation for Energy Harvesting and Power Grid Coexisting Wireless Communication Systems
IEEE Transactions on Communications
IEEE Transactions on Communications
Computer Science Mathematics