Joint Power And Duty-cycle Design Using Alternating Optimization Algorithm Under Energy Harvesting Architectures

Traditional sensor nodes are equipped with fixed power supply equipments such as batteries,thus the lifetime of sensor node is limited.When thousands of sensors are deployed in hazardous or toxic environments,it becomes inconvenient or even impossible to recharge or replace the battery.Then energy harvesting(EH)has become a viable solution to allow wireless sensor nodes self-charging for extending its lifetime.Because EH is limited by the basic EH devices and technological development,the harvested energy is generally low.Therefore,the practical harvesting and using model is important for energy management.The non-ideal circuit power which is especially non-negligible for the low harvested energy is introduced into this model.Based on the practical harvesting and using model,the intermittent transmission which introduce new variable duty-cycle can effectively achieve the optimal throughput through joint design of power and duty-cycle.Moreover,there exists three EH architectures: harvest-use(HU)model,harvest-store-use(HSU)model,harvest-use-store(HUS)model.Under the simultaneous harvesting and using model which is suited to harvest energy from environment,the proposed throughput maximization schemes under EH architectures(HU model,HSU model,HUS model)are realizing via the alternating optimization algorithm.In addition,the proposed throughput maximization schemes under HSU model are realizing via the alternating optimization algorithm under the developed non-simultaneous harvesting and using model.From the perspective of EH architectures,the proposed throughput maximization schemes make a better performance through joint design of power and duty-cycle than the fixed duty-cycle transmission schemes corresponding to different energy storage condition.Furthermore,the proposed scheme with simultaneous harvesting and using under HUS model is closest to the throughput's upper bound among of proposed schemes.Simulation results are presented to demonstrate the proposed schemes' transmission properties and its superior performance over the classic transmission schemes.