Research Of Transmission Optimization Based On Data Acquisition In Wireless Sensor Network

Wireless Sensor Networks(WSNs)provide the reliable real-time data in environmental monitoring,telemedicine,smart furniture,and military defense.Since wireless sensor network is a data-centric network,the optimization of wireless sensor network data transmission is an important research topic.Sensor network nodes are usually deployed in the field or enemy area.Due to a large redundancy in collected data,the nodes' communication overhead is increased.Therefore,the attackers capture nodes with a low resistance to capturing in order to steal the sensitive information;thus,a large number of false data might be injected in the network using the nodes' keys,which can both increase network communication cost and cause wrong decisions.This thesis focuses on redundant data elimination and false data filtering.The main research contributions are as follows:(1)A changeable length data aggregation algorithm is proposed to solve a high redundancy of data collected by WSN nodes.The weight value of perceptual data sequence is calculated by analyzing of WSN sensor data sequence.Nevertheless,the fusion data are eliminated using the weight value,and defined error threshold.The sequence length of perceived data is adjusted dynamically and adaptively according to the environment change.The simulation results have shown that proposed algorithm can effectively reduce transmission of redundant data and meet the accuracy requirements defined regarding to the environmental data change.(2)A false data filtering scheme based on dynamic key update is proposed to solve the problem of false data in WSN data transmission.In this scheme,node keys are stored in the chain and data packets,transmitted through the network,are accompanied by MAC,tag bit and ID information.The forwarding node verifies the validity of MAC,flag and ID information of the received packets.The simulation results have shown that proposed scheme can effectively filter out the false data transmitted through the network.(3)In this thesis,the prototypes of proposed algorithm and proposed false data filtering are designed.According to the prototype test,the proposed algorithm and scheme can optimize WSN data transmission,which greatly improves data transmission efficiency and data security.