A Power Allocation Strategy for Multi-Antenna Amplify-and-Forward Fading Relay Channels

In this paper, we consider a fading relay channel operating according to the amplify-and-forward protocol, where each node has full CSI and multiple-antennas are deployed at the relay node. Maximization of the achievable rate with respect to the linear processing at the relay and the power allocation at the source and relay is performed under an instantaneous sum-power constraint. In particular, it is assumed that the total power used by all the active nodes during each time slot is fixed.