Research On The Strategy Of Nodes Cooperative Transmission In Energy Heterogeneous Wireless Sensor Network

Wireless sensor network is widely used in many fields because of its low cost, dynamic topology and other characteristics. The researchers pay more and more attention on its application. Due to the cost, volume and other restrictions, the energy of sensor node is limited. Therefore, how to reduce the energy consumption effectively and extend the network lifetime, is always the emphasis in the research of wireless sensor network. The energy consumption in the wireless transmission accounts for a large proportion of total energy consumption. If we apply the virtual MIMO (Multiple Input Multiple Output) transmission in the wireless sensor network, it will be more effective to reduce the transmission energy than ordinary transmission.The focus of the virtual MIMO research is the design of node cooperative transmission strategy and the analysis of energy consumption and system capacity. In the past, most researches of cooperative transmission strategy are based on isomorphism network. However, the research of heterogeneous wireless sensor network is more close to reality. There still remain deficiencies on the design of virtual MIMO transmission and the choice of cluster head and cooperative node in the existing transmission strategy. Aimed at these deficiencies, the energy effective strategy of node cooperative transmission based on the heterogeneous wireless sensor network is put forward in this paper. The main contribution is as follows:(1) Research on the principle of virtual MIMO transmission; design the virtual MIMO transmission method between the clusters; As for the on coding, forwarding, combing and decoding, choose more suitable method for wireless sensor network; compare the energy consumption of virtual MIMO transmission with ordinary transmission; modeling analysis each node's energy consumption in the network.(2) A node cooperative transmission strategy with more effective energy, named ASVM (Advanced SEP and Virtual MIMO), for the heterogeneous wireless sensor network is put forward in this paper. This strategy combines the SEP protocol (suitable in heterogeneous wireless sensor network) and virtual MIMO transmission. What's more, the method is improved based on it in this paper. On the clustering stage, sink node with infinite energy collects the information from sensor nodes, and then clusters it. When choosing the cluster head and cooperative node, we consider the factor that senior node should have greater probability and more surplus energy and longer distance to balance the network energy. On the transmission stage, we apply the combination of ordinary transmission and virtual MIMO transmission, and choose the less energy consumption method. The results show that the proposed strategy has more advantages in reducing energy consumption, prolonging the network life cycle and improving the information receive quantity.