LTE-A 网络中的终端直通( Device-to-Device，D2D) 技术能够有效提高资源利用率，然而复用资源引起的同频干扰会制约系统容量的提升． 合理的功率控制策略可以有效降低干扰，提高网络整体性能． 为了进一步提升该网络中各类用户的功率效率，文中提出一种基于功率效率最优化的功率控制方法． 首先根据该网络资源复用的特点，从资源使用的角度提出一种新的功率效率定义方式，进而将功率分配建模为最大化该功率效率的优化问题，并提出了一种变步长增量迭代的求解算法为各类用户分配最佳发射功率． 仿真表明，提出的功率控制方法能以较低的功耗获得较高的吞吐量，与现有方案相比，在降低了复杂度的同时使功率效率上升了约 15%，有效减少了同频干扰造成的影响．

Device-to-device ( D2D) communication underlaying LTE-A cellular networks can increase the utiliza- tion efficiency of cellular resources effectively.However,the co-channel interference caused by cellular resources reuse may degrade the system throughput.An effective power control scheme can effectively suppress the interfer- ence and improve the overall performance.In order to further improve the power efficiency of cellular users,a pow- er control scheme on the basis of power efficiency optimization is presented.Firstly,according to the characteristics of network resources reuse,power efficiency is redefined from the viewpoint of resource usage.Then,power alloca- tion is formulated with the objective of maximizing power efficiency,and a step length-variable incremental iteration algorithm is proposed to derive the optimal power for both cellular and D2D users.Simulation results indicate that the proposed power control scheme helps obtain higher throughput with lower power consumption,outperforms the existing scheme by approximately 15% increment in power efficiency,decreases the computational complexity,and reduces the impact of mutual interference effectively.