全双工蜂窝网络中用户协作D2D通信的性能分析与优化

提出一种蜂窝网络中全双工蜂窝用户协作D2D(device to device)通信机制，全双工蜂窝用户采用功率域叠加支持上行传输和D2D通信并发，为无直传链路的D2D用户对协作中继；分析了系统的可达速率域，提出了一种基于最大-最小可达速率的功率分配算法。仿真分析表明，随着自干扰消除性能的提升，系统的可达速率域扩大，全双工协作D2D通信的可达速率域显著大于半双工协作D2D通信，且蜂窝上行链路和协作D2D链路间存在可达速率折中；功率分配算法能根据信道状态动态调整蜂窝用户的发射 率和功率分配因子，功率效率高，且随着最大发射功率的增加，蜂窝上行链路和协作D2D链路的可达速率趋同，能满足最大-最小准则，兼顾蜂窝上行链路和协作D2D链路间的公平性。

Performance analysis and optimization of subscriber cooperative D2D communication in full duplex cellular networks

This paper proposes a full-duplex cellular subscriber cooperative D2D communication mechanism in cellular networks. Full-duplex cellular subscribers use power domain superposition as a cooperative relay for D2D user pair without direct link, supporting uplink transmission and D2D communication concurrency. The achievable rate domain of the system is analyzed, and a power allocation algorithm based on the max-min achievable rate is proposed. The simulation results show that the achievable rate domain of the system expands with the improvement of self-interference cancellation performance, the achievable rate domain of full-duplex cooperative D2D communication is better than that of half-duplex cooperative D2D communication, and there is an achievable rate tradeoff between the cellular uplink and cooperative D2D link.The proposed power allocation algorithm can dynamically adjust the transmission power and power allocation factor of cellular subscriber according to the channel state, and the power efficiency is higher.Moreover,with the increase of maximum transmit power, the achievable rate of cellular uplink and cooperative D2D link tends to be the same, which can meet the maximum minimum criterion and take into account the fairness between cellular uplink and cooperative D2D link.