中文摘要：

D2D通信技术结合社交网络的应用是通信行业发展的热点之一,而协作通信能够满足高数据速率、广覆盖范围的通信需求。为了促进用户间协作通信的有效性和信任度,针对D2D协作通信网络,该文首先提出一种综合社交因素和物理因素的协作D2D中继模型。进而基于中断概率提出一种中继选择方案,降低D2D通信的中断概率,提高系统吞吐量;同时通过最优化理论对源设备和中继设备进行最优功率分配。仿真表明在相同条件下,该算法具有明显优于传统中继选择算法的性能,经过最优功率分配能够进一步降低通信系统的中断概率。

英文摘要：

The combination of Device-to-Device （D2D） and social networks is one of the hot topics in the current and future communication industry. Cooperative communication is with characteristics of the high data rate and wide coverage range. In order to promote the confidence and the effectiveness between users, for such a cooperative D2D communication network, a comprehensive cooperative D2D relay model is firstly put forward which combines social factors and physical factors. Then, based on the optimization of the outage probability, a relay selection scheme is proposed to reduce the outage probability and improve the system throughput of D2D communication. Furthermore, optimal power allocation of the source and relay equipment is designed. Simulation results show that under the same conditions, the proposed algorithm is superior to other relay selection algorithms with respect to the interruption performance. Moreover, through optimal power allocation, the proposed algorithm can further reduce the outage probability in the D2D cooperative communication system.