Research Of Data Fusion For Wireless Sensor Network Based On LEACH Protocol

It is different from other networks,sensor nodes of wireless sensor network is generally powered by the battery,once the batteries run out,the node is in a state of death.These factors seriously limit the life cycle of wireless sensor network.Therefore,how to reduce the consumption of energy and prolong the cycle of life become the key to the development of wireless sensor network.The LEACH protocol was proposed as the earliest clustering routing protocol.It's energy-saving and scalability had been highly improved.But LEACH also has many shortcomings,in the aspects of the election of cluster head and the balance of energy,it remained to be further improved.This paper choosed LEACH to research,and combined the LEACH with the data fusion technology.The work of this paper mainly included the following three aspects:(1)We analyzed the mechanism of LEACH,the consumption of energy and the modeling analysis for the optimal number of cluster head.And the advantages and disadvantages of LEACH are pointed out.In order to improve the mechanism of cluster head election,a new algorithm of cluster head election called ER-LEACH-MF which is based on the energy limit and multi-factors was proposed.ER-LEACH-MF defined the concept of low energy node,in order to rule out low energy nodes to participate in the competition of cluster head nodes by the corresponding mechanism,and we considered many factors in election of cluster head node including the node location and residual energy of node and the density of node.Through the improvement of the mechanism of cluster head election,the election of cluster head was more reasonable,and the consumption of energy was more balanced.(2)We combined the data fusion technology with LEACH.Considering that LEACH did not give specific algorithm or scheme of data fusion,we put forward the algorithm called MDF-LEACH which was based on LEACH.In this new algorithm,different data fusion algorithms were performed at different levels of LEACH,and in the process of route selection,data fusion algorithm is used to aggregate data.Data fusion can effectively reduce the amount of data,and save the energy.(3)Simulation was performed under the NS-2.In NS-2,the ER-LEACH-MF and MDF-LEACH algorithm were compared with LEACH in the aspects of alive node numbers,the amount of total energy consumption and network data forwarding.Simulation showed that ER-LEACH-MF and MDF-LEACH can greatly delay the death time of first nodes,and obviously improved the lifetime of sensor network.