重叠虚拟小区基于分级结构的联合功率控制算法

Hierarchical structure based joint power control algorithm for overlapped virtual cell

针对下一代无线通信系统(5G)超密网络场景面临复杂的干扰问题,采用联合功率控制和以用户为中心的虚拟小区结构,而联合功率控制由于非凸问题会导致高复杂度问题,以及重叠虚拟小区基站功率强耦合问题,故提出以用户为中心的虚拟小区基站基于分层的联合功率控制算法。算法首先利用新提出的虚拟功率概念解耦重叠虚拟小区基站功率,其次上层求解功率分割系数,下层通过迭代注水算法得到虚拟功控最优解。仿真比较结果表明,提出的算法可以提高系统吞吐量,获得更大的系统速率。

The ultra.dense network of the next generation wireless communication system(5G)is faced with the complex interference.Therefore,the joint power control and user.centered virtual cell structure are adopted.Since the joint power control has high complexity caused by the nonconvex problem,and the base station of overlapped virtual cell has strong power coupling,the hierarchical structure based joint power control algorithm for user.centered virtual cell base station is proposed.The base station power of the overlapped virtual cell is decoupled according to the proposed virtual power concept.The power allocation coefficient is resolved in the upper layer of the structure.The optimal solution of the virtual power control is obtained in the lower layer of the structure by means of water.filling algorithm.The simulation results show that the proposed algorithm can improve the system throughput,and obtain the fast system speed.