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Distributed relay assignment and power control for energy efficient bidirectional relaying

This paper addresses an optimal energy-efficiency problem subject to a desired service quality constraint for an amplify-and-forward bidirectional relaying network. Unlike most of the existing works, both the transmit and circuit energy consumptions are considered and especially the circuit energy consumption is modeled as a function of the data rate, rather than as a constant. In order to simplify its solution, the optimal energy-efficiency problem is transformed into a two-stage problem, stage 1: optimal power allocation of terminals; and stage 2: distributed relay assignment. Summarizing the results achieved at stages 1 and 2, a distributed relay assignment and power control technique is proposed for optimal energy-efficiency. Simulation results demonstrated that our proposed technique can significantly enhance the energy efficiency, while ensuring the desired service quality of the network.