中继协同D2D通信的能效优化

Energy Efficiency Optimization Method for Relay Cooperative D2D Communication

针对D2D中继通信中D2D设备电池容量受限问题,本文提出了一种逐步优化功率控制和中继选择从而最大化系统能量效率的方法。首先,在满足蜂窝链路最小数据速率的条件下,将功率控制问题建模为一个非线性规划问题,并求解出D2D发射机的最优发射功率;然后,分别利用发送节点与接收节点的邻域为半径建立节点均匀分布的球状模型;其次,基于路径损耗相似性对节点进行k-means迭代聚类,并得到路径损耗最小节点的质心;最后,将得到的质心作为中继节点进行D2D中继通信。仿真结果表明,在保证高质量通信的条件下,本文提出的优化方法能够最大化系统的能量效率。

Aiming at the limited battery capacity of D2D devices in D2D relay communication,this paper proposes a joint power control and relay selection optimization method to maximize system energy efficiency.First,under the condition that the minimum data rate of the cellular link is satisfied,the power control problem is modeled as a nonlinear programming problem,and the optimal transmission power of the D2D transmitter is solved.Then,the neighboring nodes of the sending node and the receiving node are used respectively.The domain is the radius to establish a spherical model with uniform distribution of nodes.Secondly,based on the path loss similarity,the nodes are iteratively clustered by k-means,and the centroid of the node with the smallest path loss is obtained.Finally,the centroid is used as a relay node for D2D Following the communication.The simulation results show that the optimization method proposed in this paper can maximize the energy efficiency of the system under the condition of ensuring high-quality communication.