一种新的时变衰落信道下MIMO系统的功率分配与自适应调制算法  

A Novel Algorithm of Power Allocation and Adaptive Modulation for MIMO Systems over Time-Varying Fading Channel

作　　者：贺志强[1] 王晓湘[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程学院181信箱北京100876

出　　处：《电子学报》2004年第9期1556-1559,共4页Acta Electronica Sinica

基　　金：国家自然科学基金 (No .60 1 72 0 51 );2 0 0 4教育部重点项目 (No .1 0 4 0 4 2 )

摘　　要：本文提出一种在时变衰落信道下 ,MIMO系统的功率分配和自适应调制方法 .该方法采用空域注水定理 ,在发送端天线的平均功率受限的条件下 ,按照信道传输矩阵的奇异值对发端的多天线进行最优功率分配和自适应MQAM调制 .本文从频谱效率方面对其性能进行分析 .给出了信道估计的误差和反馈时延对该方法的影响 .理论分析和仿真结果表明 ,该方法实现简单 ,且与传统的总功率受限的自适应调制方法相比 ,具有更高的频谱效率 .A novel power allocation and adaptive modulation algorithm for MIMO systems over time-varying fading channel is proposed.Using water-filling theory in space domains,the optimal power allocation and adaptive MQAM by singular values of the channel transfer matrix with average transmit power constraint is obtained.The spectral efficiency is analysed.The effect of the channel estimation error and feedback delays on the algorithm is investigated.The theoretic analysis and simulation results show that the novel algorithm is robust and easy to implement,and the spectral efficiency of the algorithm is greater than that of early-proposed algorithm with total power constraint.

关 键 词：MIMO 自适应调制 频谱效率 QAM 

分 类 号：TN929.5[电子电信—通信与信息系统]