Energy Allocation, Relay Selection and Ordering in Orthogonal Relay Networks

In this paper it is considered the orthogonal multiple relay channel at the low SNR regime. The source transmits to the destination and all the possible relays in one channel and the relays transmit in different and orthogonal channels employing the transmission received from the source and also the other relay transmissions. Based on the cut set bound for relay networks, we explore the capacity limits of this kind of communication, obtaining the energy allocation, relay selection and routing, when full channel state information (CSI) is available at every network node.