混合发射天线选择的闭环发射分集系统的优化设计  

Optimization of hybrid transmit antenna selection and closed-loop transmit diversity systems

作　　者：朱耀麟[1] 方勇[2] 汪敏[2] 

机构地区：[1]西安工程大学电子信息学院,陕西西安710048 [2]上海大学通信与信息工程学院,上海200072

出　　处：《电波科学学报》2007年第5期767-773,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(60472103);上海市优秀学科带头人基金(05XP14027);上海市重点学科项目(T0102)资助

摘　　要：研究了混合发射天线选择技术的闭环发射分集系统。针对最大率传输和等增益传输两种传输模式,根据信道矢量衰落损耗系数的排序统计分布特性,分别提出了发射天线数和射频链路数的选择算法。这两个算法可分别使系统所需的发射天线数和射频链路数最小。仿真结果显示合理地选择发射天线数和射频链路数可以大大简化系统的复杂度,减少不必要的开销。针对混合发射天线选择的等增益传输提出了相位扇区化量化算法。这种算法只需少量的量化反馈就可以使系统的性能接近全反馈情况。This paper investigates closed-loop transmit diversity systems based on transmit antenna selection. For two modes of maximal ratio transmission and equal gain transmission, the algorithms of determining both transmit antennas number and radio frequency （RF） chains number are proposed respectively according to the order statistics of wireless channel fading coefficients. The two algorithms can minimize the number of required transmit antennas and RF chains respectively. Simulation results demonstrate that appropriate selection of transmit antennas number and RF chains number can reduce complexity and cost of the systems. The phase quantization algorithm of sector phase constraining is put forward for the systems of hybrid transmit antenna selection and equal gain transmission. The performance with a few amount of quantized feedback can approach that with full feedback.

关 键 词：发射天线选择 闭环发射分集 最大率传输 等增益传输 Lloyd量化 相位扇区化 

分 类 号：TN929.5[电子电信—通信与信息系统]