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In this paper, the energy efficiency of multihop relaying over Nakagami-m fading channels is investigated. The "consumption factor", adopted as a metric to evaluate the energy efficiency, is derived for both amplify-and-forward and decodeand-forward relaying strategies. Then, based on the obtained expressions, we propose a power allocation strategy maximizing the consumption factor. In addition, a sub-optimal, low complexity, power allocation algorithm is proposed and analyzed, and the obtaineddoi:10.1109/tvt.2015.2487741 fatcat:brwlnya42rbevbao7rtu3yvviy