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Abstract: The problem of resource allocation is studied for a two-user fadingorthogonal multiaccess relay channel MARC where both users sourcescommunicate with a destination in the presence of a relay. A half-duplex relayis considered that transmits on a channel orthogonal to that used by thesources. The instantaneous fading state between every transmit-receive pair inthis network is assumed to be known at both the transmitter and receiver. Underan average power constraint at each source and the relay, the sum-rate for theachievable strategy of decode-and-forward DF is maximized over all powerallocations policies at the sources and relay. It is shown that the sum-ratemaximizing policy exploits the multiuser fading diversity to reveal theoptimality of opportunistic channel use by each user. A geometricinterpretation of the optimal power policy is also presented.



Author: Lalitha Sankar, Yingbin Liang, H. Vincent Poor, Narayan B. Mandayam

Source: https://arxiv.org/







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