中文摘要：

针对由Device-to-Device（D2D）通信系统和传统蜂窝通信系统组成的混合网络,提出了一种基于干扰对齐（Interference Alignment,IA）的D2D功率分配算法（Interference Alignment-Power Allocation,IA-PA）.利用干扰对齐方法,将混合网络中的k对D2D用户的干扰信道等效为k对互不干扰的MIMO信道,并证明了干扰对齐解的存在性.其次,基于贪婪思想,提出了一种最优功率分配算法——IA-PA.与传统蜂窝通信系统相比,IA-PA使得混合网络的总自由度提高了（k-1）/2倍.仿真表明,所提出的功率分配算法有效地抑制了混合网络的互干扰,并得到更大的系统总速率.

英文摘要：

An interference alignment （IA） based power allocation algorithm （IA-PA） is proposed for de- vice-to-device （D2D） communications underlaying cellular systems. The interferences of k D2D pairs are suppressed by using the interference alignment method; and the existence of IA solution to IA is illustra- ted. An optimal power allocation algorithm （IA-PA） based on IA is developed for cellular and D2D hybrid networks. Our developed power allocation algorithm improves the degrees of freedom （DOF） by （k-1）/2 times as compared with the traditional cellular networks. Simulation results show that our developed algo- rithm can suppress the interference between the D2D and cellular networks and obtain the higher sum rate than other power allocation algorithm.