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Energy efficiency is a critical issue in wireless communication networks since most of the communication devices have limited energy capacity. Various strategies for maximizing energy efficiency have been proposed. In this paper, the authors analyze the energy efficiency of cooperative beamforming where the source and relay nodes construct a virtual Multiple-Input Single-Output (MISO) beamforming system. In the analysis, they consider all the energy consumption overheads incurred in forming a virtual MISO system. They show that cooperative beamforming achieves not only a higher energy efficiency, but also better spectral efficiency for large transmission distances.
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