Power Allocation and Relay Selection in Multi-source Cooperative Networks
Hui Hui①② Zhu Shi-hua① Lü Gang-ming① Sun Xiao-dong①
①(School of Electronics and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China) ②(School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China)
Abstract：In order to minimizing the total transmit power while guaranteeing the outage performance at the same time, in this paper a distributed power allocation and relay selection scheme is proposed for amplify-and-forward cooperative networks with multiple sources and multiple relays. In the proposed scheme, sources select their relays independently, and introduce channel-related timers to compete for their preferred relay. Then the selected relays independently determine whether to forward the messages or not according to a forwarding threshold. Simulation results show that the proposed scheme can reduce the total transmit power of the network significantly and has a similar performance to the optimal central-controlled scheme with a much lower overhead.
2010, Vol. 32 
