Conference Proceedings

On Power Allocation for Dual-Hop Amplify-and-Forward OFDM Relay Systems

Masato Saito, Chandra RN Athaudage, Jamie Evans

GLOBECOM 2008 - 2008 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE | IEEE | Published : 2008

Abstract

The solutions to an optimal power allocation problem in dual-hop amplify-and-forward (non-regenerative) OFDM relay systems over given channel gains are provided with a joint transmit power constraint. We analytically derive the allocated power to each hop/subcarrier that satisfies the Karush-Kuhn-Tucker (KKT) conditions by solving simultaneous equations. The solutions imply that at most 3N - 1 possible power allocation candidates could exist on both source and relay nodes satisfying KKT conditions when N is the number of subcarriers. Based on the solution, a sub-optimal power allocation method that selects only significant allocated power in strong subcarriers is proposed and achieves higher..

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University of Melbourne Researchers

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Funding Acknowledgements

This study was supported by the ARC Special Research Centre for Ultra-Broadband Information Networks (CUBIN). The first author would like to thank the Telecommunications Advancement Foundation (TAF) for financial support.