Computer Science ›› 2018, Vol. 45 ›› Issue (2): 165-170.doi: 10.11896/j.issn.1002-137X.2018.02.029

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Capacity Analysis of Energy Harvesting Wireless Communication Channel Based on Hybrid Energy Storage

YAO Xin-wei, ZHONG Li-bin, WANG Wan-liang and YANG Shuang-hua   

  • Online:2018-02-15 Published:2018-11-13

Abstract: Due to the constraints of the instability of energy source and the limited storage capacities of devices in exis-ting energy harvesting technology,a hybrid energy storage structure composed by super capacitor and battery was proposed for device,and the corresponding channel capacity of the proposed structure model was analyzed.Firstly,an energy harvesting channel model based on hybrid energy storage structure was presented for a point-to-point energy harvesting communication system.Secondly,by considering the intermittent peculiarities of energy harvesting,this paper assumed that the energy arrival process conforms to the Bernoulli stochastic process.A near optimal allocation policy was proposed with the upper and lower bounds of the average system throughput.In particular,the gap of two bounds is derived to be a constant,then the approximate channel capacity is obtained.Finally,simulation results illustrate that the gap between the upper and lower bounds of channel capacity is 1.77bps/Hz and 2.49bps/Hz respectively,when harvesting energy is less than and more than storage capacity of super capacitor.Meanwhile, the experiment results show that compared with the conventional wireless node with single battery storage,the hybrid energy storage structure can improve the energy utilization and increase the channel capacity of system.The upper bound of channel capacity can be increased up to 70% when the storage capacity ratio of supper capacitor and battery is 12.

Key words: Hybrid energy storage,Energy harvesting,Channel capacity,Energy assignment,Energy arrival process

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