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The performance of relay selection in the presence of a direct source-destination link has been an open problem, essentially because a direct link introduces cross-dependencies in the relay selection that significantly complicate its analysis. Thus, the previous studies of relay selection by and large have been forced to assume that the network geometry is such that the direct link is weak enough...
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...
In this paper heterogenous networks are envisioned where multiple amplify-forward (AF) and decode-forward (DF) relays coexist. Consider a representative case with one source, one destination, and multiple relays, where at each point in time a subset (e.g. two) of the relays can be active simultaneously. The question naturally arises: how can we select relays for service from among the collection of...
In this paper we study opportunistic communication in two relay channels, the shared relay channel (SRC) and the X-relay channel (XRC). The shared relay channel consists of multiple non-interfering source-destination pairs sharing one relay. The X relay channel is a multi-source multi-destination network where each source has a message for each destination and the network is assisted by one relay...
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,...
This work studies the multiple access relay channel (MARC), specifically it explores the effect of multiuser diversity on the diversity multiplexing trade-off (DMT) performance of the MARC. A new opportunistic channel access communication scheme is proposed where the user selection depends only on the source-destination channels coefficients. This is proven to be DMT optimal. Both non-orthogonal and...
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