多发射天线选择的无线信道序统计特性研究

在独立平坦的瑞利衰落信道中,提出一种确定排序信道衰落因子大小的联合概率密度函数(PDF)序系数的方法.根据输出信噪比最大的天线选择原则,就信道状态信息(CSI)正确和差错两种不同情况,分别给出n个最大排序的信道衰落因子的边缘PDF理论式.最后, 对采用正交空时分组码的多发射天线选择系统进行数值仿真,结果表明:多天线选择能极大地提高系统的传输质量, 而且能有效地抵抗CSI差错引起的性能下降.

Investigation of order statistics characteristic of wireless fading channels of multiple transmit antennas selection

In independent flat Rayleigh fading channels, the paper presented a method that evaluated the order coefficient of the joint probability density function (PDF) of the sorted channels gain magnitude (CGM). Based on the antennas selection rule of the maximum output signal-to-noise ratio, for the two cases of the correct and the erroneous channels state information (CSI), the paper then calculated the expressions of marginal PDF of n maximal sorted CGMs, respectively, and the numerical simulation values for a multiple transmit antennas selection (MTAS) system employing orthogonal space-time block coding (STBC) were presented. The results show that MTAS can enhance largely system transmission performance, and combat effectively or mitigate the effects of the erroneous CSI.