Study On Selection Cooperative Diversity Methods With Feedback Based On Energy Harvesting

Cooperative communication technology is widely used in the field of wireless communication,because it can expand the communication range and improve the efficiency of transmission.The selection of cooperative diversity method is the main research direction of cooperative communication,due to the advantages of simplicity and flexibility.Besides,this method can reduce the complexity of cooperative communicaiton,and get the full gain of diversity.RF energy harvesting uses the characteristics of radio frequency signals that can carry information and energy simultaneously.This technology effectively solves the issues of energy limitation of nodes in the communication network,and optimizing the performance of energy consumption at the same time.If combines the selective cooperation methods with EH technology can correspondingly improve the transmission efficiency and optimize the problem of energy consumption.There have been some preliminary advances in this area,but research on selection cooperation methods based on energy harvesting in feedback scenarios is still imperfect.Then the research in this area will be the main direction of the next generation of communication network.This thesis proposes selection cooperative diversity methods with feedback based on energy harvesting.Besides,the protocol and performance of these methods are analyzed.The main works are summarized as follows:1.For the single source-destination pair and multiple-relay networks with radio frequency energy harvesting,the source node charges the relays by transmit source information to the destination and the relays.Then,select the best relay according to the instantaneous channel quality and transmit power among the relays in the decoding set.This method considers the selection of cooperative transmission with a feedback mechanism.When the direct transmission fails,the cooperative transmission started,so as to improves the transmission efficiency of the communication system and increase the network lifetime.2.Consider the single source-destination pair and multiple-relay networks with radio frequency energy harvesting.A cooperative transmission method based on ARQ is proposed.In order to solve the problem that the traditional cooperative communication technology not full use the relay-relay channel and the RF energy carried by the source information,the ARQ mechanism is introduced in this thesis.The decoding set can expand by using the available channels between the relays,so as to increase the optimal relay's selective range.Combined with the transmission power of each relay and the channel quality of relay-destination,a distributed competition method is used to select a best relay in the decoding set to transmit source information.This method expands the range of relay selection and improves the efficiency of system transmission.The simulation result shows that the selection cooperative diversity methods with feedback based on energy harvesting can effectively reduce the outage probability and improve the transmission reliability of the system.The research work in this thesis combines the energy harvesting technology and the selection cooperative diversity technology with the feedback mechanism,which expands the traditional optimal relay selection range,improves the transmission reliability of wireless communication system,and extends the life cycle of network.It provides some reference value for the next development direction of cooperative communication research.