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GLOBECOM
2009
IEEE

Optimal Relay-Subset Selection and Time-Allocation in Decode-and-Forward Cooperative Networks

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Optimal Relay-Subset Selection and Time-Allocation in Decode-and-Forward Cooperative Networks
—We present the optimal relay-subset selection and transmission-time for a decode-and-forward, half-duplex cooperative network of arbitrary size. The resource allocation is obtained by maximizing over the rates obtained for each possible subset of active relays, and the unique time allocation for each set can be obtained by solving a linear system of equations. We also give a recursive algorithm which reduces the number of operations as well as the computational load of finding the required matrix inverses. Our results, in terms of outage rate, confirm the benefit of adding potential relays to a small network and the diminishing marginal returns for a larger network. Furthermore, optimizing over the channel resources ensures that more relays are active over a larger SNR range.
Elzbieta Beres, Raviraj Adve
Added 21 May 2010
Updated 21 May 2010
Type Conference
Year 2009
Where GLOBECOM
Authors Elzbieta Beres, Raviraj Adve
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