Analysis And Improvement Of Wireless Sensor Network Routing Protocol Based On LEACH Protocol

With the development of the sensor technology,computer systems,So C and wireless communication technology rapidly, WSN has been widely used in military, traffic control, medical and health, environmental monitoring and other fields, and quickly became one of the research hot topics in the field of networks. WSN is a special network system, which is composed by a large number of sensor nodes, by the integration of data acquisition, data procession and transmission via a self organized method. This kind of research in this field is immature at present, so it has a great significance to conduce a further research on this technology.Firstly, this dissertation gives an exhaustive introduction to the background and architecture of WSN. And then makes an analysis of the characteristics of wireless sensor networks. After that, two kinds of routing protocols in WSN, flat routing and hierarchical routing protocols are given to comprehensive introduction, and made a detailed study of the several representative routing protocols of the above two routing protocols. Finally, in order to make a further research, cluster head election algorithm in LEACH of hierarchical routing protocol has been chosen to be analyzed. Therefore, a model of energy consumption can be made, and the number of the optimal cluster head can be deduced.Secondly, after the exhaustive analysis of LEACH, this dissertation has made some improvements of cluster selective algorithm and multi hop has been added in data transfer, and in terms of selective unevenness of random cluster head in LEACH protocol and not taking the insufficient energy into consideration. In the beginning, in order to solve the former problem, cluster head is selected based on the exchange information between nodes and its neighbors, the surplus energy information and distance information so as to make the cluster head nodes disperse in the whole network evenly. And then, in order to solve the latter problem, the revised algorithm adopts a combination of direct and Multi hop, which decrease the energy consumption in message transaction.At last, simulation experiments of LEACH and the revised selective algorithm is made via MATLAB, which makes an exhaustive contrast among numbers of clusters, cluster distribution and life time of nodes. The results show that the revised cluster selective algorithm has some prominent advantages over LEACH protocol in the above aspects.