Energy-Efficient Resource Allocation In Cooperative Communication Systems

With the rapid development of wireless communication technology and the increasing demands of users' services,people put forward requirements for the higher performance of mobile communication systems.Capital cooperative communication technology makes use of the cooperation between the source nodes and their neighboring nodes to obtain the spatial diversity gain,and as a result,it can effectively expand the network coverage and improve the system performance.On the other hand,the increasing of energy consumption of wireless communication systems not only brings a higher operating cost to service providers,but also causes ecological pollution.Energy-oriented green communication technology has aroused widely attention.Therefore,it is very important to improve the energy efficiency of the communication systems by implementing reasonable resource management in cooperative relay communication system.Under meeting the conditions of the user QoS and the limited transmission power,system energy efficient is regarded as the optimization target to establish the model of cooperative communication system.And then,to tackle trunk selection problem for uplink cooperative communication systems,a relay selection strategy on bipartition graph is proposed.The strategy mainly transforms the relay selection problem of cooperative communication system into a maximum matching problem of weighted bipartite graph for multiuser,multi-relay cooperative communication system,and the problem can be solved by KM algorithm.Simulation results indicate that the proposed strategy can effectively improve the system energy efficient,and has the advantage of low complexity.An allocation model of totally connected graph on intelligent water drops algorithm is proposed to deal with the problem of resource allocation in cooperative uplink communication system.On the basis of this,the intelligent water drops algorithm is improved further.The simulation results validate that the totally connected graph resource allocation scheme of optimized intelligent water drops algorithm can effectively increase energy efficient and promote system performance.