Lina Pu - Academia.edu (original) (raw)
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Papers by Lina Pu
IEEE Transactions on Communications, 2021
Through field experiments, we observed a varying instantaneous charging capacity of the energy bu... more Through field experiments, we observed a varying instantaneous charging capacity of the energy buffer with respect to the dynamic intensity of the incident RF signal in the RF energy harvesting system (RF-EHS). The dependency of charging capacity on the incident power of RF signal challenges existing RF energy harvesting models that assume constant charging capacity. In order to accurately describe the energy harvesting process in the real system, we propose a new energy clamp model. The new model reveals that RF intensity higher than the sensitivity of the harvester circuit cannot always guarantee successful energy reception, especially when the energy level of energy buffer is high while the intensity of the incident power is relatively weak. In order to improve the efficiencies of energy harvest and energy utilization in an RF-EHS, we develop new offline (i.e., non-causal) optimal and online (i.e., causal) suboptimal data transmission strategies based on the energy clamp model. Simulation results show that the new strategy can considerably improve the throughput after taking into account the varying instantaneous charging capacity caused by the dynamic RF power density in the air. Index Terms-RF energy harvesting system, varying RF power density, energy clamp model, transmission strategy * The 1.2 dB standard deviation in signal strength seems stable from communication point of view, which, however, is strong enough to cause 17.9% charging voltage dynamics in the RF energy harvesting system. The two strongest bands on 887.5 MHz and 739 MHz are the downlink signal from LTE base stations that are about 280 feet away. The eNB IDs of the two LTE base stations are 204758 and 204558, respectively [26]. The 1952.5 MHz and 2115 MHz bands are from other distant LTE base stations.
IEEE Transactions on Communications, 2021
Through field experiments, we observed a varying instantaneous charging capacity of the energy bu... more Through field experiments, we observed a varying instantaneous charging capacity of the energy buffer with respect to the dynamic intensity of the incident RF signal in the RF energy harvesting system (RF-EHS). The dependency of charging capacity on the incident power of RF signal challenges existing RF energy harvesting models that assume constant charging capacity. In order to accurately describe the energy harvesting process in the real system, we propose a new energy clamp model. The new model reveals that RF intensity higher than the sensitivity of the harvester circuit cannot always guarantee successful energy reception, especially when the energy level of energy buffer is high while the intensity of the incident power is relatively weak. In order to improve the efficiencies of energy harvest and energy utilization in an RF-EHS, we develop new offline (i.e., non-causal) optimal and online (i.e., causal) suboptimal data transmission strategies based on the energy clamp model. Simulation results show that the new strategy can considerably improve the throughput after taking into account the varying instantaneous charging capacity caused by the dynamic RF power density in the air. Index Terms-RF energy harvesting system, varying RF power density, energy clamp model, transmission strategy * The 1.2 dB standard deviation in signal strength seems stable from communication point of view, which, however, is strong enough to cause 17.9% charging voltage dynamics in the RF energy harvesting system. The two strongest bands on 887.5 MHz and 739 MHz are the downlink signal from LTE base stations that are about 280 feet away. The eNB IDs of the two LTE base stations are 204758 and 204558, respectively [26]. The 1952.5 MHz and 2115 MHz bands are from other distant LTE base stations.