Abstract: The authors discuss the statistical distributions of multiple-input multiple-output (MIMO) channels over flat Rayleigh fading via the order statistics analysis. Simplified expressions are derived for expectations of the vector energies when the column (or row) number is equal to 1 and 2, which is followed by the upper and lower bounds when the antenna number at one side approaches infinite. Finally, some applications of the analysis, such as the computation of antenna selection and diversity gain, are discussed.

Key words: MIMO, order statistics, flat fading, gamma distribution

摘要： 以顺序统计量分析 Rayleigh 平坦衰落 MIMO 信道矩阵各向量能量的分布特征，给出其各阶矩公式以及列（行）数为 1 和 2 时行（列）向量的能量期望值的简洁表达式，并由此推导出信道矩阵的单边维数趋于无穷时行和列向量能量期望值的上下界。最后讨论了上述分析结果在 MIMO 系统的天线选择和分集增益计算方面的应用。

关键词: MIMO, 顺序统计量, 平坦衰落, gamma分布