Relay power allocation schemes for multiuser cooperative communication

This paper investigates the power allocation algorithms based on convex theory for multiuser multi-relay amplify-and-forward (AAF) wireless cooperative network. In this system, there are multiple single-antenna users to communicate with one destination with the help of multiple relay nodes at the same time. In order to guarantee the quality-of-service (QoS) for all the users and reduce the power consumption, we propose two relay power allocation strategies, one is to minimize the total relay transmission power and the other is to maximize the minimum signal-to-noise ratio (SNR) among all the users. Simulation results and analysis demonstrate the efficiency and fairness of our proposed strategies.