Abstract
In this paper, a rigorous analysis of the performance of time-switching energy harvesting strategy that is applied for a half-duplex bidirectional wireless sensor network with intermediate relay over a Rician fading channel is presented to provide the exact-form expressions of the outage probability, achievable throughput and the symbol-error-rate (SER) of the system under the hardware impairment condition. Using the proposed probabilistic models for wireless channels between mobile nodes as well as for the hardware noises, we derive the outage probability of the system, and then the throughput and SER can be obtained as a result. Both exact analysis and asymptotic analysis at high signal-power-to-noise-ratio regime are provided. Monte Carlo simulation is also conducted to verify the analysis. This work confirms the effectiveness of energy harvesting applied in wireless sensor networks over a Rician fading channel, and can provide an insightful understanding about the effect of various parameters on the system performance.
Highlights
Wireless sensor networks (WSNs) are subject to the constraint of energy storage at each mobile node [1,2]
We proposed and evaluated an energy harvesting-based spectrum access model in cognitive radio network with hardware impairment [29]
Recent development in wireless sensor networks have led to an exponential growth of the energy demand for operating the networks, which raises a question about how to efficiently use the available energy in the wireless environment
Summary
Wireless sensor networks (WSNs) are subject to the constraint of energy storage at each mobile node [1,2]. The performance of wireless powered sensor networks for Internet of Things (IoT) application was studied in [4], where the authors proposed the optimal power allocation to maximize the system throughput and derived the closed-form of that solution In those papers, the channel gains are assumed either to be constant or to be a Rayleigh distributed random variable. Mishra et al [26] did provide impressive results on joint optimization of power allocation, power splitting for EH, and relay placement for SWIPT over a Rician channel They only use an approximation expression of outage probability to formulate the optimization problem, and did not consider the hardware impairment at the nodes.
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