Abstract
This paper studies the problem of maximizing the energy utilization for data transmission in sensors with periodical wireless charging process while taking into account the thermal effect. Two classes of problems are analyzed: one is the case that wireless charging can process for only a limited period of time, and the other is the case that wireless charging can process for a long enough time. Algorithms are proposed to solve the problems and analysis of these algorithms are also provided. For the first problem, three subproblems are studied, and, for the general problem, we give an algorithm that can derive a performance bound of compared to an optimal solution. In addition, for the second problem, we provide an algorithm with performance bound for the general problem. Simulations confirm the analysis of the algorithms.
Highlights
Wireless charging has an extensive future in many areas [1,2,3,4,5,6,7], where the devices such as implanted sensors are expected to work for a long time, and it is inconvenient to replace batteries
The wireless charging process can result in a thermal effect, which is a critical concern in biosensors [8,9,10,11]
As the human body has its own cooling process, we consider a periodical wireless charging process where in each period the sensors will receive wireless energy first, and, for the rest of the period, it is used to eliminate the thermal effect in this paper
Summary
Wireless charging has an extensive future in many areas [1,2,3,4,5,6,7], where the devices such as implanted sensors are expected to work for a long time, and it is inconvenient to replace batteries. The sensors should not receive wireless energy all the time, and the wireless charging process shoud be intermittent so that the thermal effects can be eliminated after charging for a while. As the human body has its own cooling process, we consider a periodical wireless charging process where in each period the sensors will receive wireless energy first, and, for the rest of the period, it is used to eliminate the thermal effect in this paper. If a battery is almost full, after a period of wireless charging, the battery gets full, but some energy may be wasted because there is not enough capacity to store energy in the battery, that is, energy overflowing occurs In this case, it does not take full advantage of the whole period of wireless charging. The simulation results are presented, the related work follows, and it concludes this paper
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