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Relay selection is known to simplify signaling, avoid complex synchronization schemes, and also preserve the spatial diversity provided by the total number of relays available in the network. In this paper we investigate the effect of introducing relays of different types (relaying capabilities). We analyze opportunistic relay selection schemes in a heterogeneous multi-relay network with a single...
We consider a relay that simultaneously assists multiple source-destination pairs that do not have a direct link, which we denote the gateway channel, and explore the sum capacity of this network in the presence of quasi-static fading. In the absence of transmitter-side channel state information (CSI), we study superpostion as well as orthogonal channel access. In the presence of transmitter CSI,...
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