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High energy efficient relay adaptive transmission strategy

This Cooperative relay technology has been widely studied, but the energy efficiency (EE) of relay transmission system is not always higher than that of direct transmission system. In this paper, the EEs of the direct transmission (DT) mode, the One - way relay transmission (OWRT) mode and the two-way relay transmission (TWRT) mode in different channel fading conditions are studied, and the expressions of EE are obtained. Comparing to the EEs of the three transmission modes under different channel fading, the system adaptively selects the transmission mode with higher EE according to the actual data transmission rate. Simulation results show that, compared to the traditional transmission mode, the proposed energy-efficient relay adaptive transmission strategy greatly improves the EE of the relay transmission system.