一种虚拟MIMO中的低复杂度功率分配算法

摘要

A power allocation algorithm based on linear water-filling with low complexity is proposed for the amplify-forward (AF) virtual-multiple input multiple output (V-MIMO) systems.The coordinated users with poor channel condition are excluded quickly,and the linear recursive relations among the remaining coordinated users are exploited to change the iterative calculation of optimal power allocation algorithm into linear allocation,which greatly simplifies the algorithm with quick power allocaton.Simulations under Rayleigh fading circumstance show that the capacity and outage probability performance of the proposed algorithm are comparable to those of the optimal one.%针对放大转发(Amplify-forward,AF)方式下,虚拟多输入多输出(Virtual-multiple input multiple output,V-MIMO)系统中的功率分配问题,提出一种基于线性注水原理的低复杂度功率分配算法.该算法通过快速排除信道条件较差的协作用户,并利用各协作用户功率值之间的线性递推关系式,将最优功率分配算法中的迭代运算转化为线性运算,在实现功率快速分配的同时,达到显著降低算法复杂度的目的.瑞利信道下的仿真结果表明,采用该算法所获得的系统容量和中断概率性能与最优功率分配算法相当.