ROBUST POWER ALLOCATION IN WIRELESS MULTIBAND RELAY NETWORKS

A cooperative network can be modeled with a basic relay channel, composed by a couple of nodes - source and destination - and a third node called relay. The source broadcasts its communication to both the destination and the relay. Therefore the relay transmits the same information to the destination, which combines the two signals received from both the source and the relay. This system allows to increase the range of the network and to achieve diversity at the Destination even with single-antenna devices. This model can be extended to networks where multiple relays work in parallel [8] [7]. Recently a new power allocation algorithm was presented [6]. The relay power algorithm (RPA) is robust against uncertainties in the channel state information (CSI). In this paper we extend the procedure to a network where relays transmit in a multiband channel. A comparison between uniform and robust power allocation is also reported.