基于不完全CSI的D2D通信平均总和速率优化

AVERAGE SUM RATE OPTIMIZATION OF D2D COMMUNICATION BASED ON IMPERFECT CSI

针对不完全CSI下Cellular-D2D通信系统中,蜂窝用户与D2D用户频谱复用带来的共道干扰问题,提出以最大化平均总和速率为优化目标的D2D用户接入策略。利用随机几何理论建立Cellular-D2D中的共道干扰模型,通过一阶自回归模型刻画不完全CSI特性,同时利用D2D用户间的距离变化刻画D2D链路的动态时变特性。利用詹森(Jensen)不等式得到D2D链路的平均总和速率封闭表达式,进而得到D2D用户接入密度的最优解。仿真实验表明,该策略具有可行性和有效性。

Aiming at the problem of co-channel interference between cellular user and device-to-device(D2D)user in Cellular-D2D communication system under imperfect CSI,this paper proposes a D2D user access strategy with the goal of maximizing the average sum rate.It used stochastic geometry theory to establish the co-channel interference model in Cellular-D2D.The first-order autoregressive model was used to describe the imperfect CSI characteristics,and the dynamic time-varying characteristics of D2D links were used to describe the distance variation between D2D links.We used Jensen s inequality to obtain the closed expression of the average sum rate of D2D links,and then the optimal solution of D2D user access density was obtained.The feasibility and effectiveness of the proposed strategy is verified by simulation.