一种改进的MIMO-OFDM系统注水功率分配算法  

An Improved Water-filling Power Allocation Method for MIMO-OFDM Systems

作　　者：范金刚[1] 路晓菊[1] 刘珍斌[1] 卢照敢[2] 

机构地区：[1]中国人民解放军69026部队通信网络技术管理中心 [2]西安交通大学电子与信息工程学院

出　　处：《信息化研究》2010年第10期17-20,共4页INFORMATIZATION RESEARCH

摘　　要：鉴于目前MIMO-OFDM系统中大多数比特功率分配算法需要多次迭代,复杂度较高,及系统比特分配离散性的特点,本文结合贪婪功率分配算法逐步优化的思想,提出了修正的二次注水功率比特分配算法。该算法首先利用注水功率分配方案得到连续速率最优的功率分配,接着针对实际数据速率量化的误差对不同特征模式下的功率进行微调,实验证明改进后的算法有效提高了系统的总体传输速率。Most power allocation methods for MIMO-OFDM system have the characteristics of higher complexity and discreteness of power allocation, requiring many iterations. This article combines the idea of gradual optimization of the greedy power allocation method, proposing the amendment method of residual power reallocation. This method firstly gets the continuous optimal power allocation by the method of water-filling power allocation, then, as for the quantitation errors of the actual data rate, takes an adaptive modulations fine-tune for residual power re-allocations effectively increases the through on different characteristic modes. Experiments show that the improved method put of the system.

关 键 词：MIMO—OFDM 注水 功率分配 

分 类 号：TN92[电子电信—通信与信息系统]