Research On Performance Of Indoor Sensor Network Based On Wireless Energy Harvesting Technology

In recent years,the problem of energy loss in the field of wireless communication has been received widespread attention from all walks of life.The overuse of natural energy sources will cause a series of negative effects such as resource depletion and global warming.In the context of advocating green communication,energy harvesting(EH)technology has gradually entered people vision.The traditional EH technology mainly collects energy from renewable energy sources such as light energy,water energy,wind energy,tidal energy,etc.However,the external environment changes randomly and cannot provide a stable energy supply,and most communication nodes are powered by batteries in the sensor network,but it is extremely inconvenient to replace the batteries in environments with dangerous natural conditions.Therefore,maximizing the life cycle of wireless networks is a difficult problem to be solved.Many scientific researchers have gradually focused on collecting energy from radio frequency(RF)signals,Compared with collecting energy from natural energy such as solar energy and wind energy,the advantage of this technology can simultaneously collect energy and transmit information.This EH technology is also referred to as simultaneous wireless information and power transfer(SWIPT)technology.Based on the SWIPT technology,this paper mainly studies the performance of the one-way transmission relay cooperative system using amplify-and-forward(AF)over the log-normal fading channel.The main research contents are as follows:On the one hand,this paper considers a unidirectional SWIPT network over the Log-normal fading channel,where the relay node is an AF type relay.Combining time switching-based relaying(TSR)and power splitting-based relaying(PSR)protocols,a hybrid protocol(HP)is proposed.We derived the analytical expression of the outage probability and improved the system performance by optimizing t time switching factor.The simulation results verify the correctness of the proposed protocol in this paper.The theoretical analysis shows that the performance of the proposed HP outperforms the existing PSR and TSR protocols.At the same time,it is verified that the transmission power of the source node can greatly affect the performance of the system,and it shows that increasing the channel variance of the source node to the relay node and the relaynode to the destination node can effectively reduce the system outage probability.On the other hand,it is considered that the relay node and the destination node obtain radio frequency energy from the source node and other interference signals in the environment to provide power for the relay node based on the unidirectional three-node relay transmission network.At the same time,the analytical expressions of system outage probability and throughput over Log-normal channel are derived.The simulation results verify the correctness of the theoretical derivation results and prove that the transmission rate has a greater impact on system performance than other parameters.In addition,the input signal-to-noise ratio has little effect on the throughput of TSR and PSR protocols in the case of variable gain relays.