MIMO系统的发射天线选择及自适应链路实现  

Transmit antenna selection and link adaptation for MIMO systems

作　　者：王文杰[1] 张莹[1] 

机构地区：[1]西安交通大学电子与信息工程学院,陕西西安710049

出　　处：《系统工程与电子技术》2007年第8期1222-1225,共4页Systems Engineering and Electronics

基　　金：国家自然科学基金(60572046);国家"863"高科技研究发展计划(2006AA01Z220)资助课题

摘　　要：针对多输入多输出(MIMO)系统信道低秩引起信道容量下降的问题,提出了一种依据信道状态信息进行发射天线选择的算法,并给出了以此算法为基础的VBLAST自适应链路的实现方法。发射天线的选择依据权系数的范数大小进行,该方法可以有效降低天线选择的运算量。仿真结果表明,该方法的选择效果逼近最大容量法的选择效果。自适应链路实现方法将发射天线数的确定和天线选择并行进行,保证了在所处通信环境下达到最大的空间复用系数。The low rank channel may result in decrease of channle capaity in multiple-input multiple-output （MIMO）systems. To solve this problem,an antenna selection algorihm is propsed to select the optimm set of transmit antennas. The selection algorithm is based on eliminating the link whose weight has maximum norm. The simulation results show that the proposed algoritom can achieve approximately the same system capacity as the traditional selection scheme, and at the same time, reduces the complextiy of antenna selection. Based on the selection algorithm, a link adaptation scheme in vertical-BLAST is also discussed. The selected antenna set and number are obtained at the same time is the scheme, and the adaptive system can achieve maximum spatial diversity order.

关 键 词：多输入多输出 发射天线选择 自适应链路 信道状态信息 

分 类 号：TN929.5[电子电信—通信与信息系统]