Fundamental power-allocation for cooperative relay networks

Authors:
Ryoulhee Kwak;John M. Cioffi
Affiliations:
Department of Electrical Engineering, Stanford University, Stanford, CA;Department of Electrical Engineering, Stanford University, Stanford, CA
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

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Abstract

This paper develops a optimal power-allocation strategy for the general multi-hop cooperative relay systems. The systems allow a different number of hops for different paths and different destinations for different paths. When the orthogonality of channels is guaranteed for each hop, and when the systems want to minimize the total system power to transmit the data to the destinations, it is shown that the optimal power-allocation satisfies the following condition: the summation of all water-levels of a path should be the same as those of others.