Research On Relay And Relay Cluster Selection In Wireless Relay Network

The cooperative communication technology has made a rapidly development recent years.It’s basic thought is in the muti-user communication environment,mobile users can share each others’antenna and communicate by using it.This equals to produce muti-antenna virtual environment,so that the system can get the space diversity gain,and its performance will improve.In the traditional communication networks,the data transmit between mobile users and base station, after the participation of the relay, the system get a diversity advantage, which make the traditional network gain the multiple antenna system effect, and can realize multi-hops transmission performance gain.Based on the background of cooperative communication and green safety, this essay take safety capacity threshold into wireless relay network, design design reasonable optimal relay selection algorithm in order to improve the quality of service, and at the same time, take trust value evaluation mechanism into muti-hop cooperative network, and make a improvement and innovation on the relay cluster forming scheme.The main innovation points of this essay are as follows:1. In view of two of the most important system performance parameters in the current wireless relay network environment, system throughput and interrupt probability,we design the optimization relay selection algorithm. 2. Take safety capacity threshold into wireless relay network, compared with the traditional simple relay selection algorithm, this algorithm fully consider the interference and eavesdropping of the listener final selection results will not only satisfy the communication performance indicators, and satisfy the safety capacity, it is the choice of reliable safety.3. Propose a cluster head selection scheme based on the LEACH algorithm, based on the characteristics of comprehensive evaluation, our choosing scheme makes the distribution of the cluster head more uniform and reasonable, the cluster head selection accord with the actual distribution of nodes, which balance the network load.4. Propose a cluster members selection scheme based on the LEACH algorithm, considering the non cluster head nodes residual energy, distance from the cluster head nodes, to a certain extent, the network load balance, effectively prolong the network life cycle.