中文摘要：

在能效问题中，设备本身的电路功耗已成为不可忽略的一部分，故将中继引入无线网络之后势必会带来更严重的电路功耗。该文基于解码转发（DF）中继OFDM频率选择性链路，结合电路所耗功率，提出一种最优能效功率分配方法，求得DF中继链路能效上界，同时分析了速率和功率限制对能效的影响。仿真结果表明，该文所提基于能效的功率分配算法可求出最大化能效的最优功率解，并能在保证较高速率的同时获得最好的系统能效。

英文摘要：

Introducing relay to wireless networks results in severer energy consumption. The circuit power consumption of devices can not be neglected in energy efficient problem. In this paper, Orthogonal Frequency Division Multiplexing （OFDM）-based frequency-selective channel is considered in Decode-and-Forward （DF） relay link. An optimal allocation method is proposed, in which the transmit power in each hop is adaptively allocated to maximize the energy efficiency. The effects of the rate and power constraints on energy efficiency are also analyzed. Simulation results show that the proposed energy efficient power allocation method can achieve the highest energy efficiency while ensuring the high data rate.