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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
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 )
