Optimized Power Allocation for Multiple-Antenna Multiple-Relay Cooperative Communication System

One of the main advantages of relayed communication is that it reduces the necessary transmit power and distributes transmitted power throughout the hops. This implies lower interference to the rest of the network and consequently improves performance of the system. In this paper, the authors investigate optimized power allocation over two-hop multiple antenna fixed relays for a given power budget. Outage probability which is the probability that the link quality falls bellow the certain threshold in a Rayleigh fading channel is used as the performance criterion. It is determined that increasing the number of relays and antennas at each relay increases capacity.