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CORR
2007
Springer

Opportunistic Communications in an Orthogonal Multiaccess Relay Channel

9 years 11 months ago
Opportunistic Communications in an Orthogonal Multiaccess Relay Channel
— The problem of resource allocation is studied for a two-user fading orthogonal multiaccess relay channel (MARC) where both users (sources) communicate with a destination in the presence of a relay. A half-duplex relay is considered that transmits on a channel orthogonal to that used by the sources. The instantaneous fading state between every transmit-receive pair in this network is assumed to be known at both the transmitter and receiver. Under an average power constraint at each source and the relay, the sum-rate for the achievable strategy of decode-and-forward (DF) is maximized over all power allocations (policies) at the sources and relay. It is shown that the sum-rate maximizing policy exploits the multiuser fading diversity to reveal the optimality of opportunistic channel use by each user. A geometric interpretation of the optimal power policy is also presented.
Lalitha Sankar, Yingbin Liang, H. Vincent Poor, Na
Added 13 Dec 2010
Updated 13 Dec 2010
Type Journal
Year 2007
Where CORR
Authors Lalitha Sankar, Yingbin Liang, H. Vincent Poor, Narayan B. Mandayam
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