Date Added: Sep 2012
Cooperative communication achieves diversity through spatially separated cooperating nodes, which are battery powered in most applications. Therefore, the energy consumption must be minimized without compromising the quality of service. In this paper, the authors present a novel energy allocation scheme for multiple relay nodes that results in efficient cooperative Multiple-Input Multiple-Output (MIMO) communication. Considering channel path loss, the total transmission energy is distributed between the source and the relay nodes. The energy distribution ratio between the relay and direct link is optimized such that the quality of received signal is maintained with minimum total transmission energy consumption. They calculate the energy distribution ratio analytically and verified it through computer simulation.