Optimal power allocation for orthogonal relay systems with quality-of-service constraints

Authors:
F. Ahmed;Timothy N. Davidson
Affiliations:
School of Computational Engineering and Science, McMaster University, Hamilton, Ontario, Canada;School of Computational Engineering and Science, McMaster University, Hamilton, Ontario, Canada
Venue:
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Year:
2009

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Abstract

In this paper, we address the problem of minimizing the cost of the power required to achieve reliable communication at a specified rate on a link that is assisted by an orthogonal half-duplex relay. The considered scenario is that of a narrowband channel with a long coherence time, single-antenna nodes, and the availability of perfect channel state information. We consider the regenerative decode-and-forward and amplify-and-forward relaying strategies, and for both of these strategies we obtain closed-form expressions for the optimal powers. These expressions yield insight into the design of relay-assisted communication schemes with quality-of-service requirements.