多小区多用户协同资源效率优化算法

摘要

对第5代无线通信而言,频谱效率和能源效率已经成为衡量无线通信系统性能的两个关键指标.研究了多小区多用户下行链路的资源效率最大化问题,其中资源效率定义为频谱效率和能源效率的加权和.干扰信道的用户速率是一个非凸函数,因此所研究的优化问题也是一个非凸优化问题.利用分数规划理论和用户速率与最小均方误差间的关系,将原优化问题转换成一个易于求解的优化问题.针对所获得的转换问题,提出一种分层迭代交替优化算法,并证明算法的收敛性.数值仿真表明了所提算法的有效性.%Spectrum efficiency (SE) and energy efficiency (EE) are key specifications for the performance of the fifth generation (5G) wireless communications.In this paper,we study optimization of resource efficiency of a coordinated multi-cell multi-user downlink system defined as a weighted sum of SE and EE.The considered optimization is a nonconvex problem due to nonconvexity of the user rate for an interference channel.The original problem is transformed to a tractable form by exploiting the fractional problem theory and the relation between the user rate and minimum mean square error.A hierarchical iterative alternating optimization algorithm is then proposed to address the latter.Furthermore,convergence of the algorithm is shown.Numerical results are provided to validate effectiveness of the proposed algorithm.