Research And Implementation Of Wireless Sensor Network Based On SWIPT

Simultaneous Wireless Information and Power Transfer(SWIPT),which realizes parallel transmission of information and energy,changes the structure of traditional wireless sensor network.Therefore,it has important academic value of research and wide application prospects.Due to the problems of high power consumption,short life and difficult maintenance of wireless sensor nodes in traditional wireless sensor network,this dissertation conducts academic research and hardware implementation from two aspects which includes wireless energy transmission technology and optimization of communication protocol.The main contents of this thesis are as follows.(1)Due to the problems of high cost,short life,difficult maintenance and unsustainable development of battery-powered nodes in traditional wireless sensor network,a wireless sensor node model based on SWIPT technology is proposed to realize parallel transmission of information and energy efficiently at different frequency points.(2)When the central device in star topology network sends information to the nodes,the nodes working in receiver state listens for a long time,which causes excessive power consumption.Therefore,Transmitter Active Response Protocol(TARP)based on Enhanced ShockBurst(ESB)underlying protocol is proposed to make the nodes keep working in transmitter state while receiving the information sent by the central device.(3)Due to the problem of data loss caused by bump of packets in wireless sensor network,the packet encapsulation and retransmission mechanism of ESB underlying protocol anf the node capacity of wireless sensor network is improved.Besides,the limitation of node capacity(up to 8 nodes)in ESB underlying protocol was broken.(4)The dissertation realizes a real-time weather monitoring network based on SWIPT and designs software and hardware of the central device and wireless sensor nodes.In addition,the feasibility and superiority of SWIPT technology in wireless sensor network is verified through hardware experiments.A real-time weather monitoring network based on SWIPT is implemented with Nordic Semiconductor's nRF52 series MCU,Vishay's VEML6075 UV sensor and Bosch's BME280 environmental sensor.Through hardware experiments,it is calculated that the wireless energy transmission efficiency is not less than 70%and all of sensor nodes keep working stably for a long time,which verifies the feasibility and application value of the theory proposed in this thesis.