部分信道状态信息下简化的MIMO功率分配算法  

Simplified power allocation algorithm for MIMO systems with partial channel state information

作　　者：杜娟[1,2] 康桂霞[1] 张平[1] 

机构地区：[1]北京邮电大学无线新技术研究所,北京100876 [2]兰州大学信息科学与工程学院,兰州730000

出　　处：《哈尔滨工业大学学报》2009年第7期124-127,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(60502038);国家高技术研究发展计划资助项目(2006AA01Z272;2006AA01Z283);北京科技新星计划资助项目(2007A046);高等学校学科创新引智计划资助项目(B07005)

摘　　要：针对当发端只有部分信道状态信息(Partial CSI)-信道统计信息时,最优的发送功率分配算法计算复杂度高这一问题,利用詹森(Jensen)不等式和注水法得到了一种简单的、低计算复杂度的功率分配算法.实验结果表明,对于收天线数不小于发天线数的MIMO系统,该算法对应的平均互信息和最优功率分配算法对应的信道容量吻合较好,可作为一种简便的功率分配算法应用于实际中.A power allocation algorithm with low computational complexity was developed based on Jensen＇ s inequality and water-filling algorithm, which can overcome the problem of high computational complexity of the optimal power allocation algorithm in multiple-input/multiple-output （MIMO） systems with spatial correlated receive and transmit antennas as well as the partial channel state information （ CSI）, i.e. the channel statistics information at transmitter. The experimental results indicate that the average mutual information corresponding to the proposed algorithm is very close to the channel capacity corresponding to the optimal algorithm for systems with equal or fewer transmit than receive antennas. The proposed algorithm can be used as a simple solution to the transmission power allocation in reality.

关 键 词：多输入多输出系统 部分信道状态信息 信道容量 协方差反馈 JENSEN不等式 注水法 

分 类 号：TN911.2[电子电信—通信与信息系统]