Opportunistic Cooperation with Node Selection Based on Power Allocation
Ning Hu, Xiaofeng Zhong, Shidong Zhou, Jing Wang · 2008
Cooperative communication is an efficient technology to combat fading in wireless networks. In this paper, we propose an opportunistic cooperation algorithm with decode- and-forward strategy under a total power constraint. The relay selection and power allocation are jointly optimized to maximize the minimum of the weighted channel strengths between the links of source-relay and relay-destination in slow fading wireless channels. Our algorithm performs the power allocation between the source and the relay to decrease outage probability, and chooses a relay from multiple candidates with the knowledge of channel amplitude in two-hop scenario. Though the proposed algorithm is heuristic, numerical simulations show the advantages of this algorithm with the path loss and Rayleigh distributed fading.