有限反馈MIMO系统中一种基于双码本的功率分配与预编码方案  

Precoding and Power Allocation Based on Double Codebook in MIMO Systems with Limited Feedback

作　　者：刘建国[1] 杨绿溪[1] 

机构地区：[1]东南大学信息科学与工程学院,江苏南京210096

出　　处：《电子学报》2007年第B06期78-82,共5页Acta Electronica Sinica

基　　金：国家973重点基础研究发展规划(No.2007CB310603);国家自然科学基金(No.60672093;No.60496310);国家863高技术研究发展计划(No.2007AA01Z262);江苏省自然科学基金(No.BK2005061);华为高校基金

摘　　要：研究表明,有限反馈预编码能有效利用信道信息提高MIMO系统频谱效率,在此基础上,在发射端进行功率控制将使频谱效率得到进一步提升.为了最大化有限反馈MIMO系统的频谱效率,本文提出了一种基于自适应调制的功率分配与预编码方案.为了减少反馈量,该方案通过双码本方式来反馈预编码矩阵和功率控制矢量,并给出了一种基于K-均值聚类的功率码本设计方法.仿真结果表明,该方案的反馈信息量少,且获得了较好频谱性能.Recent research results show that limited feedback precoding proves effective in increasing transmission rate in the multiple-input multiple-output（MIMO） system, further performance gain can be achieved if power control is used along with limited feedback precoding at transmitter.In order to maximize the spectral efficiency of the finite-rate feedback MIMO systems, a novel power allocation and precoding scheme is proposed based on adaptive modulation. Furthermore, we feed back the precoding matrix and power vector through double codebooks for reducing the feedback overhead, and a new codebook design approach for power vector based on the clustering analysis is developed. Simulation results show that the proposed scheme greatly improves the spectral efficiency with low feedback overhead.

关 键 词：自适应调制 有限反馈 多输入多输出(MIMO) 功率分配 预编码 

分 类 号：TN92[电子电信—通信与信息系统]