Improvement And Investigation On Wireless Sensor Network LEACH Routing Protocols

Wireless sensor network(WSN)is a kind of product with setting sensor technology, computer technology and wireless communication technology,many kinds of field technology and so on together. It can monitor, aware and gain all kinds of information of the environment and the object within the network distribution. Then after processing, it can transmit information to the user. WSN can be applied to military, environment, medical treatment, family and agriculture etc. Thus it has the wide application prospect.This article analyses and improves wireless sensor network routing protocols based on wireless sensor network as the research background. It probes into LEACH routing protocols emphatically. The main research is as follows.(1) It analyses LEACH routing protocols in group headers selecting, establishing groups, routes between groups. Because of the classical LEACH choosing group heads without considering the residual energy of node, group size and nodes distribution, It proposes weighted LEACH routing protocols improving algorithm based on node residual energy and distribution. This algorithm proposes the surplus energy and nodes distribution function to adjust the threshold function of selecting group heads. The more surplus energy and the better distribution, the bigger threshold. It ensures the better comprehensive performance nodes become group heads. Make the quantity of group nodes within the reasonable range by controlling the transmission power of group heads.(2) Due to the much longer distance between the group heads and BS, group heads will consume the much energy fast which causes the nodes death during transmitting data. It will lead to make the lifetime of the whole network shorten. It proposes multi-hop routing based on ant colony optimization algorithm.The key point is that not only considering distance factors, but also energy factor, while improving ACS chooses next-hop node. Thereby the best route has been found between group heads and the base station (BS).(3) Establish a simulation experiment for the improving algorithm simulation test through the NS2 software platform. The simulation results show that the improving LEACH routing protocols can optimize the group choosing, balance node energy consumption of the network and prolong the lifetime of the network. The proposed multiple hops routing optimization algorithm can find the best route which satisfies the energy consumption least and the relative shortest path what verifies correctness and effectiveness of the improving algorithm.